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Image processing articles from across Nature Portfolio
Image processing is manipulation of an image that has been digitised and uploaded into a computer. Software programs modify the image to make it more useful, and can for example be used to enable image recognition.
Latest Research and Reviews
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UNSEG: unsupervised segmentation of cells and their nuclei in complex tissue samples
An unsupervised segmentation algorithm that achieves state-of-art deep learning performance for segmenting cells and their nuclei in complex biological tissue images without requiring any training data.
- Bogdan Kochetov
- Phoenix D. Bell
- Shikhar Uttam
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Adaptive condition-aware high-dimensional decoupling remote sensing image object detection algorithm
- Chenshuai Bai
- Xiaofeng Bai
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Deep learning-assisted segmentation of X-ray images for rapid and accurate assessment of foot arch morphology and plantar soft tissue thickness
- Tianhong Ru
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A mixed Mamba U-net for prostate segmentation in MR images
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Visual interpretability of image-based classification models by generative latent space disentanglement applied to in vitro fertilization
Identifying complex patterns through deep learning often comes at the cost of interpretability. Focusing on the interpretation of classification of in vitro fertilization embryos, the authors present DISCOVER, an approach that enables visual interpretability of image-based classification models.
- Tamar Schwartz
- Assaf Zaritsky
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Multiwell-based G0-PCC assay for radiation biodosimetry
- Ekaterina Royba
- Igor Shuryak
- David J. Brenner
News and Comment
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The promise of machine learning approaches to capture cellular senescence heterogeneity
The identification of senescent cells is a long-standing unresolved challenge, owing to their intrinsic heterogeneity and the lack of universal markers. In this Comment, we discuss the recent advent of machine-learning-based approaches to identifying senescent cells by using unbiased, multiparameter morphological assessments, and how these tools can assist future senescence research.
- Imanol Duran
- Cleo L. Bishop
- Ryan Wallis
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Visual interpretability of bioimaging deep learning models
The success of deep learning in analyzing bioimages comes at the expense of biologically meaningful interpretations. We review the state of the art of explainable artificial intelligence (XAI) in bioimaging and discuss its potential in hypothesis generation and data-driven discovery.
Next-generation AI for connectomics
New approaches in artificial intelligence (AI), such as foundation models and synthetic data, are having a substantial impact on many areas of applied computer science. Here we discuss the potential to apply these developments to the computational challenges associated with producing synapse-resolution maps of nervous systems, an area in which major ambitions are currently bottlenecked by AI performance.
- Michał Januszewski
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Multimodal large language models for bioimage analysis
Multimodal large language models have been recognized as a historical milestone in the field of artificial intelligence and have demonstrated revolutionary potentials not only in commercial applications, but also for many scientific fields. Here we give a brief overview of multimodal large language models through the lens of bioimage analysis and discuss how we could build these models as a community to facilitate biology research.
- Shanghang Zhang
- Jianxu Chen
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Neurotransmitters at a glance
Machine learning approaches can distinguish six different classes of presynapses from electron micrographs across the Drosophila brain.
- Rita Strack
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Omega — harnessing the power of large language models for bioimage analysis
- Loïc A. Royer
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Showing papers on "Image processing published in 2023"
Ieee transactions on image processing.
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Image Processing On Line
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SNIS: A Signal Noise Separation-Based Network for Post-Processed Image Forgery Detection
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Deep learning-based real-world object detection and improved anomaly detection for surveillance videos
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Noncontact Sensing Techniques for AI-Aided Structural Health Monitoring: A Systematic Review
Automatic seat identification system in smart transport using iot and image processing, practical application of digital image processing in measuring concrete crack widths in field studies.
2 citations
Saliency map in image visual quality assessment and processing
Integrated diffusion image operator (idio): a pipeline for automated configuration and processing of diffusion mri data, development of complete image processing system including image filtering, image compression & image security, android-based herpes disease detection application using image processing, automated invoice data extraction using image processing, efficient object detection and classification approach using htyolov4 and m2rfo-cnn, deep and low-rank quaternion priors for color image processing, implementation of automated pipeline for resting-state fmri analysis with pacs integration, stress detection using machine learning and image processing, automated extraction of seed morphological traits from images, identification of counterfeit indian currency note using image processing and machine learning classifiers, computer vision on x-ray data in industrial production and security applications: a comprehensive survey, iot based image processing filters, comprehensive automatic processing and analysis of adaptive optics flood illumination retinal images on healthy subjects., research on super-resolution image based on deep learning, ocr-mrd: performance analysis of different optical character recognition engines for medical report digitization, joint graph attention and asymmetric convolutional neural network for deep image compression, brain tumor diagnosis using image fusion and deep learning, brain tumor diagnosis using machine learning: a review, a study of air-water flow in a narrow rectangular duct using an image processing technique, deep learning using a residual deconvolutional network enables real-time high-density single-molecule localization microscopy., improved frqi on superconducting processors and its restrictions in the nisq era, darsia: an open-source python toolbox for two-scale image processing of dynamics in porous media.
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Digital Image Processing: Advanced Technologies and Applications
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A Comprehensive Overview of Image Enhancement Techniques
- Review article
- Published: 23 April 2021
- Volume 29 , pages 583–607, ( 2022 )
Cite this article
- Yunliang Qi 1 ,
- Zhen Yang 1 ,
- Wenhao Sun 2 ,
- Meng Lou 1 ,
- Jing Lian 2 ,
- Wenwei Zhao 1 ,
- Xiangyu Deng 3 &
- Yide Ma 1
7953 Accesses
60 Citations
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Image enhancement plays an important role in improving image quality in the field of image processing, which is achieved by highlighting useful information and suppressing redundant information in the image. In this paper, the development of image enhancement algorithms is surveyed. The purpose of our review is to provide relevant researchers with a comprehensive and systematic analysis on image enhancement techniques and give them a valuable reference. Various image enhancement algorithms were mentioned and underlying difficulties, limitations, merits and disadvantages were discussed in applying these techniques in the past two decades with three aspects: supervised algorithm, unsupervised algorithm and quality evaluation, respectively. Further, we summarize some existing problems and analyze the future development trend of existing enhanced algorithms.
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A Systematic Review on Image Enhancement Techniques
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Acknowledgements
This work is jointly supported by the National Natural Science Foundation of China (No.62061023 and 61961037), the Natural Science Foundation of Gansu Province (No.18JR3RA288) and the Fundamental Research Funds for the Central Universities of China (No.lzujbky-2017-it72).
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Qi, Y., Yang, Z., Sun, W. et al. A Comprehensive Overview of Image Enhancement Techniques. Arch Computat Methods Eng 29 , 583–607 (2022). https://doi.org/10.1007/s11831-021-09587-6
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Application research of digital media image processing technology based on wavelet transform
- Lina Zhang 1 ,
- Lijuan Zhang 2 &
- Liduo Zhang 3
EURASIP Journal on Image and Video Processing volume 2018 , Article number: 138 ( 2018 ) Cite this article
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With the development of information technology, people access information more and more rely on the network, and more than 80% of the information in the network is replaced by multimedia technology represented by images. Therefore, the research on image processing technology is very important, but most of the research on image processing technology is focused on a certain aspect. The research results of unified modeling on various aspects of image processing technology are still rare. To this end, this paper uses image denoising, watermarking, encryption and decryption, and image compression in the process of image processing technology to carry out unified modeling, using wavelet transform as a method to simulate 300 photos from life. The results show that unified modeling has achieved good results in all aspects of image processing.
1 Introduction
With the increase of computer processing power, people use computer processing objects to slowly shift from characters to images. According to statistics, today’s information, especially Internet information, transmits and stores more than 80% of the information. Compared with the information of the character type, the image information is much more complicated, so it is more complicated to process the characters on the computer than the image processing. Therefore, in order to make the use of image information safer and more convenient, it is particularly important to carry out related application research on image digital media. Digital media image processing technology mainly includes denoising, encryption, compression, storage, and many other aspects.
The purpose of image denoising is to remove the noise of the natural frequency in the image to achieve the characteristics of highlighting the meaning of the image itself. Because of the image acquisition, processing, etc., they will damage the original signal of the image. Noise is an important factor that interferes with the clarity of an image. This source of noise is varied and is mainly derived from the transmission process and the quantization process. According to the relationship between noise and signal, noise can be divided into additive noise, multiplicative noise, and quantization noise. In image noise removal, commonly used methods include a mean filter method, an adaptive Wiener filter method, a median filter, and a wavelet transform method. For example, the image denoising method performed by the neighborhood averaging method used in the literature [ 1 , 2 , 3 ] is a mean filtering method which is suitable for removing particle noise in an image obtained by scanning. The neighborhood averaging method strongly suppresses the noise and also causes the ambiguity due to the averaging. The degree of ambiguity is proportional to the radius of the field. The Wiener filter adjusts the output of the filter based on the local variance of the image. The Wiener filter has the best filtering effect on images with white noise. For example, in the literature [ 4 , 5 ], this method is used for image denoising, and good denoising results are obtained. Median filtering is a commonly used nonlinear smoothing filter that is very effective in filtering out the salt and pepper noise of an image. The median filter can both remove noise and protect the edges of the image for a satisfactory recovery. In the actual operation process, the statistical characteristics of the image are not needed, which brings a lot of convenience. For example, the literature [ 6 , 7 , 8 ] is a successful case of image denoising using median filtering. Wavelet analysis is to denoise the image by using the wavelet’s layering coefficient, so the image details can be well preserved, such as the literature [ 9 , 10 ].
Image encryption is another important application area of digital image processing technology, mainly including two aspects: digital watermarking and image encryption. Digital watermarking technology directly embeds some identification information (that is, digital watermark) into digital carriers (including multimedia, documents, software, etc.), but does not affect the use value of the original carrier, and is not easily perceived or noticed by a human perception system (such as a visual or auditory system). Through the information hidden in the carrier, it is possible to confirm the content creator, the purchaser, transmit the secret information, or determine whether the carrier has been tampered with. Digital watermarking is an important research direction of information hiding technology. For example, the literature [ 11 , 12 ] is the result of studying the image digital watermarking method. In terms of digital watermarking, some researchers have tried to use wavelet method to study. For example, AH Paquet [ 13 ] and others used wavelet packet to carry out digital watermark personal authentication in 2003, and successfully introduced wavelet theory into digital watermark research, which opened up a new idea for image-based digital watermarking technology. In order to achieve digital image secrecy, in practice, the two-dimensional image is generally converted into one-dimensional data, and then encrypted by a conventional encryption algorithm. Unlike ordinary text information, images and videos are temporal, spatial, visually perceptible, and lossy compression is also possible. These features make it possible to design more efficient and secure encryption algorithms for images. For example, Z Wen [ 14 ] and others use the key value to generate real-value chaotic sequences, and then use the image scrambling method in the space to encrypt the image. The experimental results show that the technology is effective and safe. YY Wang [ 15 ] et al. proposed a new optical image encryption method using binary Fourier transform computer generated hologram (CGH) and pixel scrambling technology. In this method, the order of pixel scrambling and the encrypted image are used as keys for decrypting the original image. Zhang X Y [ 16 ] et al. combined the mathematical principle of two-dimensional cellular automata (CA) with image encryption technology and proposed a new image encryption algorithm. The image encryption algorithm is convenient to implement, has good security, large key amount, good avalanche effect, high degree of confusion, diffusion characteristics, simple operation, low computational complexity, and high speed.
In order to realize the transmission of image information quickly, image compression is also a research direction of image application technology. The information age has brought about an “information explosion” that has led to an increase in the amount of data, so that data needs to be effectively compressed regardless of transmission or storage. For example, in remote sensing technology, space probes use compression coding technology to send huge amounts of information back to the ground. Image compression is the application of data compression technology on digital images. The purpose of image compression is to reduce redundant information in image data and store and transmit data in a more efficient format. Through the unremitting efforts of researchers, image compression technology is now maturing. For example, Lewis A S [ 17 ] hierarchically encodes the transformed coefficients, and designs a new image compression method based on the local estimation noise sensitivity of the human visual system (HVS). The algorithm can be easily mapped to 2-D orthogonal wavelet transform to decompose the image into spatial and spectral local coefficients. Devore R A [ 18 ] introduced a novel theory to analyze image compression methods based on wavelet decomposition compression. Buccigrossi R W [ 19 ] developed a probabilistic model of natural images based on empirical observations of statistical data in the wavelet transform domain. The wavelet coefficient pairs of the basis functions corresponding to adjacent spatial locations, directions, and scales are found to be non-Gaussian in their edges and joint statistical properties. They proposed a Markov model that uses linear predictors to interpret these dependencies, where amplitude is combined with multiplicative and additive uncertainty and indicates that it can interpret statistical data for various images, including photographic images, graphic images, and medical images. In order to directly prove the efficacy of the model, an image encoder called Embedded Prediction Wavelet Image Coder (EPWIC) was constructed in their research. The subband coefficients use a non-adaptive arithmetic coder to encode a bit plane at a time. The encoder uses the conditional probability calculated from the model to sort the bit plane using a greedy algorithm. The algorithm considers the MSE reduction for each coded bit. The decoder uses a statistical model to predict coefficient values based on the bits it has received. Although the model is simple, the rate-distortion performance of the encoder is roughly equivalent to the best image encoder in the literature.
From the existing research results, we find that today’s digital image-based application research has achieved fruitful results. However, this kind of results mainly focus on methods, such as deep learning [ 20 , 21 ], genetic algorithm [ 22 , 23 ], fuzzy theory, etc. [ 24 , 25 ], which also includes the method of wavelet analysis. However, the biggest problem in the existing image application research is that although the existing research on digital multimedia has achieved good research results, there is also a problem. Digital multimedia processing technology is an organic whole. From denoising, compression, storage, encryption, decryption to retrieval, it should be a whole, but the current research results basically study a certain part of this whole. Therefore, although one method is superior in one of the links, it is not necessary whether this method will be suitable for other links. Therefore, in order to solve this problem, this thesis takes digital image as the research object; realizes unified modeling by three main steps of encryption, compression, and retrieval in image processing; and studies the image processing capability of multiple steps by one method.
Wavelet transform is a commonly used digital signal processing method. Since the existing digital signals are mostly composed of multi-frequency signals, there are noise signals, secondary signals, and main signals in the signal. In the image processing, there are also many research teams using wavelet transform as a processing method, introducing their own research and achieving good results. So, can we use wavelet transform as a method to build a model suitable for a variety of image processing applications?
In this paper, the wavelet transform is used as a method to establish the denoising encryption and compression model in the image processing process, and the captured image is simulated. The results show that the same wavelet transform parameters have achieved good results for different image processing applications.
2.1 Image binarization processing method
The gray value of the point of the image ranges from 0 to 255. In the image processing, in order to facilitate the further processing of the image, the frame of the image is first highlighted by the method of binarization. The so-called binarization is to map the point gray value of the image from the value space of 0–255 to the value of 0 or 255. In the process of binarization, threshold selection is a key step. The threshold used in this paper is the maximum between-class variance method (OTSU). The so-called maximum inter-class variance method means that for an image, when the segmentation threshold of the current scene and the background is t , the pre-attraction image ratio is w0, the mean value is u0, the background point is the image ratio w1, and the mean value is u1. Then the mean of the entire image is:
The objective function can be established according to formula 1:
The OTSU algorithm makes g ( t ) take the global maximum, and the corresponding t when g ( t ) is maximum is called the optimal threshold.
2.2 Wavelet transform method
Wavelet transform (WT) is a research result of the development of Fourier transform technology, and the Fourier transform is only transformed into different frequencies. The wavelet transform not only has the local characteristics of the Fourier transform but also contains the transform frequency result. The advantage of not changing with the size of the window. Therefore, compared with the Fourier transform, the wavelet transform is more in line with the time-frequency transform. The biggest characteristic of the wavelet transform is that it can better represent the local features of certain features with frequency, and the scale of the wavelet transform can be different. The low-frequency and high-frequency division of the signal makes the feature more focused. This paper mainly uses wavelet transform to analyze the image in different frequency bands to achieve the effect of frequency analysis. The method of wavelet transform can be expressed as follows:
Where ψ ( t ) is the mother wavelet, a is the scale factor, and τ is the translation factor.
Because the image signal is a two-dimensional signal, when using wavelet transform for image analysis, it is necessary to generalize the wavelet transform to two-dimensional wavelet transform. Suppose the image signal is represented by f ( x , y ), ψ ( x , y ) represents a two-dimensional basic wavelet, and ψ a , b , c ( x , y ) represents the scale and displacement of the basic wavelet, that is, ψ a , b , c ( x , y ) can be calculated by the following formula:
According to the above definition of continuous wavelet, the two-dimensional continuous wavelet transform can be calculated by the following formula:
Where \( \overline{\psi \left(x,y\right)} \) is the conjugate of ψ ( x , y ).
2.3 Digital water mark
According to different methods of use, digital watermarking technology can be divided into the following types:
Spatial domain approach: A typical watermarking algorithm in this type of algorithm embeds information into the least significant bits (LSB) of randomly selected image points, which ensures that the embedded watermark is invisible. However, due to the use of pixel bits whose images are not important, the robustness of the algorithm is poor, and the watermark information is easily destroyed by filtering, image quantization, and geometric deformation operations. Another common method is to use the statistical characteristics of the pixels to embed the information in the luminance values of the pixels.
The method of transforming the domain: first calculate the discrete cosine transform (DCT) of the image, and then superimpose the watermark on the front k coefficient with the largest amplitude in the DCT domain (excluding the DC component), usually the low-frequency component of the image. If the first k largest components of the DCT coefficients are represented as D =, i = 1, ..., k, and the watermark is a random real sequence W =, i = 1, ..., k obeying the Gaussian distribution, then the watermark embedding algorithm is di = di(1 + awi), where the constant a is a scale factor that controls the strength of the watermark addition. The watermark image I is then obtained by inverse transforming with a new coefficient. The decoding function calculates the discrete cosine transform of the original image I and the watermark image I * , respectively, and extracts the embedded watermark W * , and then performs correlation test to determine the presence or absence of the watermark.
Compressed domain algorithm: The compressed domain digital watermarking system based on JPEG and MPEG standards not only saves a lot of complete decoding and re-encoding process but also has great practical value in digital TV broadcasting and video on demand (VOD). Correspondingly, watermark detection and extraction can also be performed directly in the compressed domain data.
The wavelet transform used in this paper is the method of transform domain. The main process is: assume that x ( m , n ) is a grayscale picture of M * N , the gray level is 2 a , where M , N and a are positive integers, and the range of values of m and n is defined as follows: 1 ≤ m ≤ M , 1 ≤ n ≤ N . For wavelet decomposition of this image, if the number of decomposition layers is L ( L is a positive integer), then 3* L high-frequency partial maps and a low-frequency approximate partial map can be obtained. Then X k , L can be used to represent the wavelet coefficients, where L is the number of decomposition layers, and K can be represented by H , V , and D , respectively, representing the horizontal, vertical, and diagonal subgraphs. Because the sub-picture distortion of the low frequency is large, the picture embedded in the watermark is removed from the picture outside the low frequency.
In order to realize the embedded digital watermark, we must first divide X K , L ( m i , n j ) into a certain size, and use B ( s , t ) to represent the coefficient block of size s * t in X K , L ( m i , n j ). Then the average value can be expressed by the following formula:
Where ∑ B ( s , t ) is the cumulative sum of the magnitudes of the coefficients within the block.
The embedding of the watermark sequence w is achieved by the quantization of AVG.
The interval of quantization is represented by Δ l according to considerations of robustness and concealment. For the low-level L th layer, since the coefficient amplitude is large, a larger interval can be set. For the other layers, starting from the L -1 layer, they are successively decremented.
According to w i = {0, 1}, AVG is quantized to the nearest singular point, even point, D ( i , j ) is used to represent the wavelet coefficients in the block, and the quantized coefficient is represented by D ( i , j ) ' , where i = 1, 2,. .., s ; j = 1,2,..., t . Suppose T = AVG /Δ l , TD = rem(| T |, 2), where || means rounding and rem means dividing by 2 to take the remainder.
According to whether TD and w i are the same, the calculation of the quantized wavelet coefficient D ( i , j ) ' can be as follows:
Using the same wavelet base, an image containing the watermark is generated by inverse wavelet transform, and the wavelet base, the wavelet decomposition layer number, the selected coefficient region, the blocking method, the quantization interval, and the parity correspondence are recorded to form a key.
The extraction of the watermark is determined by the embedded method, which is the inverse of the embedded mode. First, wavelet transform is performed on the image to be detected, and the position of the embedded watermark is determined according to the key, and the inverse operation of the scramble processing is performed on the watermark.
2.4 Evaluation method
Filter normalized mean square error.
In order to measure the effect before and after filtering, this paper chooses the normalized mean square error M description. The calculation method of M is as follows:
where N 1 and N 2 are Pixels before and after normalization.
Normalized cross-correlation function
The normalized cross-correlation function is a classic algorithm of image matching algorithm, which can be used to represent the similarity of images. The normalized cross-correlation is determined by calculating the cross-correlation metric between the reference map and the template graph, generally expressed by NC( i , j ). If the NC value is larger, it means that the similarity between the two is greater. The calculation formula for the cross-correlation metric is as follows:
where T ( m , n ) is the n th row of the template image, the m th pixel value; S ( i , j ) is the part under the template cover, and i , j is the coordinate of the lower left corner of the subgraph in the reference picture S.
Normalize the above formula NC according to the following formula:
Peak signal-to-noise ratio
Peak signal-to-noise ratio is often used as a measure of signal reconstruction quality in areas such as image compression, which is often simply defined by mean square error (MSE). Two m × n monochrome images I and K , if one is another noise approximation, then their mean square error is defined as:
Then the peak signal-to-noise ratio PSNR calculation method is:
Where Max is the maximum value of the pigment representing the image.
Information entropy
For a digital signal of an image, the frequency of occurrence of each pixel is different, so it can be considered that the image digital signal is actually an uncertainty signal. For image encryption, the higher the uncertainty of the image, the more the image tends to be random, the more difficult it is to crack. The lower the rule, the more regular it is, and the more likely it is to be cracked. For a grayscale image of 256 levels, the maximum value of information entropy is 8, so the more the calculation result tends to be 8, the better.
The calculation method of information entropy is as follows:
Correlation
Correlation is a parameter describing the relationship between two vectors. This paper describes the relationship between two images before and after image encryption by correlation. Assuming p ( x , y ) represents the correlation between pixels before and after encryption, the calculation method of p ( x , y ) can be calculated by the following formula:
3 Experiment
3.1 image parameter.
The images used in this article are all from the life photos, the shooting tool is Huawei meta 10, the picture size is 1440*1920, the picture resolution is 96 dbi, the bit depth is 24, no flash mode, there are 300 pictures as simulation pictures, all of which are life photos, and no special photos.
3.2 System environment
The computer system used in this simulation is Windows 10, and the simulation software used is MATLAB 2014B.
3.3 Wavelet transform-related parameters
For unified modeling, the wavelet decomposition used in this paper uses three layers of wavelet decomposition, and Daubechies is chosen as the wavelet base. The Daubechies wavelet is a wavelet function constructed by the world-famous wavelet analyst Ingrid Daubechies. They are generally abbreviated as dbN, where N is the order of the wavelet. The support region in the wavelet function Ψ( t ) and the scale function ϕ ( t ) is 2 N-1, and the vanishing moment of Ψ( t ) is N . The dbN wavelet has good regularity, that is, the smooth error introduced by the wavelet as a sparse basis is not easy to be detected, which makes the signal reconstruction process smoother. The characteristic of the dbN wavelet is that the order of the vanishing moment increases with the increase of the order (sequence N), wherein the higher the vanishing moment, the better the smoothness, the stronger the localization ability of the frequency domain, and the better the band division effect. However, the support of the time domain is weakened, and the amount of calculation is greatly increased, and the real-time performance is deteriorated. In addition, except for N = 1, the dbN wavelet does not have symmetry (i.e., nonlinear phase), that is, a certain phase distortion is generated when the signal is analyzed and reconstructed. N = 3 in this article.
4 Results and discussion
4.1 results 1: image filtering using wavelet transform.
In the process of image recording, transmission, storage, and processing, it is possible to pollute the image signal. The digital signal transmitted to the image will appear as noise. These noise data will often become isolated pixels. One-to-one isolated points, although they do not destroy the overall external frame of the image, but because these isolated points tend to be high in frequency, they are portable on the image as a bright spot, which greatly affects the viewing quality of the image, so to ensure the effect of image processing, the image must be denoised. The effective method of denoising is to remove the noise of a certain frequency of the image by filtering, but the denoising must ensure that the noise data can be removed without destroying the image. Figure 1 is the result of filtering the graph using the wavelet transform method. In order to test the wavelet filtering effect, this paper adds Gaussian white noise to the original image. Comparing the white noise with the frequency analysis of the original image, it can be seen that after the noise is added, the main image frequency segment of the original image is disturbed by the noise frequency, but after filtering using the wavelet transform, the frequency band of the main frame of the original image appears again. However, the filtered image does not change significantly compared to the original image. The normalized mean square error before and after filtering is calculated, and the M value before and after filtering is 0.0071. The wavelet transform is well protected to protect the image details, and the noise data is better removed (the white noise is 20%).
![research papers on image processing technology figure 1](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs13640-018-0383-6/MediaObjects/13640_2018_383_Fig1_HTML.png)
Image denoising results comparison. (The first row from left to right are the original image, plus the noise map and the filtered map. The second row from left to right are the frequency distribution of the original image, the frequency distribution of the noise plus the filtered Frequency distribution)
4.2 Results 2: digital watermark encryption based on wavelet transform
As shown in Fig. 2 , the watermark encryption process based on wavelet transform can be seen from the figure. Watermarking the image by wavelet transform does not affect the structure of the original image. The noise is 40% of the salt and pepper noise. For the original image and the noise map, the wavelet transform method can extract the watermark well.
![research papers on image processing technology figure 2](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs13640-018-0383-6/MediaObjects/13640_2018_383_Fig2_HTML.png)
Comparison of digital watermark before and after. (The first row from left to right are the original image, plus noise and watermark, and the noise is removed; the second row are the watermark original, the watermark extracted from the noise plus watermark, and the watermark extracted after denoising)
According to the method described in this paper, the image correlation coefficient and peak-to-noise ratio of the original image after watermarking are calculated. The correlation coefficient between the original image and the watermark is 0.9871 (the first column and the third column in the first row in the figure). The watermark does not destroy the structure of the original image. The signal-to-noise ratio of the original picture is 33.5 dB, and the signal-to-noise ratio of the water-jet printing is 31.58SdB, which proves that the wavelet transform can achieve watermark hiding well. From the second row of watermarking results, the watermark extracted from the image after noise and denoising, and the original watermark correlation coefficient are (0.9745, 0.9652). This shows that the watermark signal can be well extracted after being hidden by the wavelet transform.
4.3 Results 3: image encryption based on wavelet transform
In image transmission, the most common way to protect image content is to encrypt the image. Figure 3 shows the process of encrypting and decrypting an image using wavelet transform. It can be seen from the figure that after the image is encrypted, there is no correlation with the original image at all, but the decrypted image of the encrypted image reproduces the original image.
![research papers on image processing technology figure 3](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs13640-018-0383-6/MediaObjects/13640_2018_383_Fig3_HTML.png)
Image encryption and decryption process diagram comparison. (The left is the original image, the middle is the encrypted image, the right is the decryption map)
The information entropy of Fig. 3 is calculated. The results show that the information entropy of the original image is 3.05, the information entropy of the decrypted graph is 3.07, and the information entropy of the encrypted graph is 7.88. It can be seen from the results of information entropy that before and after encryption. The image information entropy is basically unchanged, but the information entropy of the encrypted image becomes 7.88, indicating that the encrypted image is close to a random signal and has good confidentiality.
4.4 Result 4: image compression
Image data can be compressed because of the redundancy in the data. The redundancy of image data mainly manifests as spatial redundancy caused by correlation between adjacent pixels in an image; time redundancy due to correlation between different frames in an image sequence; spectral redundancy due to correlation of different color planes or spectral bands. The purpose of data compression is to reduce the number of bits required to represent the data by removing these data redundancy. Since the amount of image data is huge, it is very difficult to store, transfer, and process, so the compression of image data is very important. Figure 4 shows the result of two compressions of the original image. It can be seen from the figure that although the image is compressed, the main frame of the image does not change, but the image sharpness is significantly reduced. The Table 1 shows the compressed image properties.
![research papers on image processing technology figure 4](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs13640-018-0383-6/MediaObjects/13640_2018_383_Fig4_HTML.png)
Image comparison before and after compression. (left is the original image, the middle is the first compression, the right is the second compression)
It can be seen from the results in Table 1 that after multiple compressions, the size of the image is significantly reduced and the image is getting smaller and smaller. The original image needs 2,764,800 bytes, which is reduced to 703,009 after a compression, which is reduced by 74.5%. After the second compression, only 182,161 is left, which is 74.1% lower. It can be seen that the wavelet transform can achieve image compression well.
5 Conclusion
With the development of informatization, today’s era is an era full of information. As the visual basis of human perception of the world, image is an important means for humans to obtain information, express information, and transmit information. Digital image processing, that is, processing images with a computer, has a long history of development. Digital image processing technology originated in the 1920s, when a photo was transmitted from London, England to New York, via a submarine cable, using digital compression technology. First of all, digital image processing technology can help people understand the world more objectively and accurately. The human visual system can help humans get more than 3/4 of the information from the outside world, and images and graphics are the carriers of all visual information, despite the identification of the human eye. It is very powerful and can recognize thousands of colors, but in many cases, the image is blurred or even invisible to the human eye. Image enhancement technology can make the blurred or even invisible image clear and bright. There are also some relevant research results on this aspect of research, which proves that relevant research is feasible [ 26 , 27 ].
It is precisely because of the importance of image processing technology that many researchers have begun research on image processing technology and achieved fruitful results. However, with the deepening of image processing technology research, today’s research has a tendency to develop in depth, and this depth is an in-depth aspect of image processing technology. However, the application of image processing technology is a system engineering. In addition to the deep requirements, there are also systematic requirements. Therefore, if the unified model research on multiple aspects of image application will undoubtedly promote the application of image processing technology. Wavelet transform has been successfully applied in many fields of image processing technology. Therefore, this paper uses wavelet transform as a method to establish a unified model based on wavelet transform. Simulation research is carried out by filtering, watermark hiding, encryption and decryption, and image compression of image processing technology. The results show that the model has achieved good results.
Abbreviations
Cellular automata
Computer generated hologram
Discrete cosine transform
Embedded Prediction Wavelet Image Coder
Human visual system
Least significant bits
Video on demand
Wavelet transform
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Acknowledgements
The authors thank the editor and anonymous reviewers for their helpful comments and valuable suggestions.
This work was supported by
Shandong social science planning research project in 2018
Topic: The Application of Shandong Folk Culture in Animation in The View of Digital Media (No. 18CCYJ14).
Shandong education science 12th five-year plan 2015
Topic: Innovative Research on Stop-motion Animation in The Digital Media Age (No. YB15068).
Shandong education science 13th five-year plan 2016–2017
Approval of “Ports and Arts Education Special Fund”: BCA2017017.
Topic: Reform of Teaching Methods of Hand Drawn Presentation Techniques (No. BCA2017017).
National Research Youth Project of state ethnic affairs commission in 2018
Topic: Protection and Development of Villages with Ethnic Characteristics Under the Background of Rural Revitalization Strategy (No. 2018-GMC-020).
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About the authors
Zaozhuang University, No. 1 Beian Road., Shizhong District, Zaozhuang City, Shandong, P.R. China.
Lina, Zhang was born in Jining, Shandong, P.R. China, in 1983. She received a Master degree from Bohai University, P.R. China. Now she works in School of Media, Zaozhuang University, P.R. China. Her research interests include animation and Digital media art.
Lijuan, Zhang was born in Jining, Shandong, P.R. China, in 1983. She received a Master degree from Jingdezhen Ceramic Institute, P.R. China. Now she works in School of Fine Arts and Design, Zaozhuang University, P.R. China. Her research interests include Interior design and Digital media art.
Liduo, Zhang was born in Zaozhuang, Shandong, P.R. China, in 1982. He received a Master degree from Monash University, Australia. Now he works in School of economics and management, Zaozhuang University. His research interests include Internet finance and digital media.
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Zhang, L., Zhang, L. & Zhang, L. Application research of digital media image processing technology based on wavelet transform. J Image Video Proc. 2018 , 138 (2018). https://doi.org/10.1186/s13640-018-0383-6
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Received : 28 September 2018
Accepted : 23 November 2018
Published : 05 December 2018
DOI : https://doi.org/10.1186/s13640-018-0383-6
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A Study on Various Image Processing Techniques
International Journal of Emerging Technology and Innovative Engineering Volume 5, Issue 5, May 2019
7 Pages Posted: 4 Jun 2019
Chithra P.L
University of Madras
Date Written: May 7, 2019
The image processing techniques plays vital role on image Acquisition, image pre-processing, Clustering, Segmentation and Classification techniques with different kind of images such as Fruits, Medical, Vehicle and Digital text images etc. In this study the various images to remove unwanted noise and performs enhancement techniques such as contrast limited adaptive histogram equalization, Laplacian and Harr filtering, unsharp masking, sharpening, high boost filtering and color models then the Clustering algorithms are useful for data logically and extract pattern analysis, grouping, decision-making, and machine-learning techniques and Segment the regions using binary, K-means and OTSU segmentation algorithm. It Classifying the images with the help of SVM and K-Nearest Neighbour(KNN) Classifier to produce good results for those images.
Keywords: Image Acquisition, Image preprocessing, Image enhancement, Clustering, Region of Interest (ROI) Image segmentation, Classification
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Chithra P.L (Contact Author)
University of madras ( email ).
Chennai, Tamil Nadu 600 005 India
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31 Jan 2023 - Practice Periodical on Structural Design and Construction. TL;DR: In this paper , the authors describe two field studies that used digital image processing to measure the width of cracks in concrete structures and demonstrate that image-based measurements are comparable to microscope measurements.
All kinds of image processing approaches. | Explore the latest full-text research PDFs, articles, conference papers, preprints and more on IMAGE PROCESSING. Find methods information, sources ...
When we consider the volume of research developed, there is a clear increase in published research papers targeting image processing and DL, over the last decades. ... Wu, Q. Research on deep learning image processing technology of second-order partial differential equations. Neural Comput. Appl. 2023, 35, 2183-2195.
This paper proposes cloud computing technology and image processing algorithms for image data processing. Among them, the material structure and performance of the system can choose a veri cation algorithm to achieve the nal fi fi operation. Moreover, let us start with the image editing features.
Digital Image Processing: Advanced Technologies and Applications. A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Computing and Artificial Intelligence". Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 54828. Printed Edition Available!
The topics covered in this special issue include (i) intelligent image processing applications and services to fulfill the real-time processing and performance demands, (ii) real-time deep learning and machine learning solutions to improve computational speed and increase recognition rates at network edges, (iii) new frameworks to optimize real-time AIoT image processing, and (iv) combining ...
Abstract. Digital image processing technology is one of the most vital areas of computer science discipline. Its application areas involve computer-aided design, Fourier transformation, three ...
Abstract. Artificial intelligence algorithm can optimize the traditional image processing technology, so that the technology can give more accurate and high-quality results. This paper mainly introduces the basic concept of artificial intelligence algorithm and its application advantages in image processing and then establishes the artificial ...
Digital image processing technology has gone through rapid development and is extensively applied in daily life and production, with the rapid development of modern information technology. It plays an inestimable role in remote sensing, medicine, recognition and other fields. This paper briefly introduces the basic concept of digital image ...
With the development of machine learning for decades, there are still many problems unsolved, such as image recognition and location detection, image classification, image generation, speech recognition, natural language processing and so on. In the field of deep learning research, the research on image classification has always been the most basic, traditional and urgent research direction ...
Abstract. Image Processing includes changing the nature of an image in order to improve its pictorial information for human interpretation, for autonomous machine perception. Digital image ...
In order to achieve better image processing effect, this paper focuses on the application of artificial intelligence algorithm in image processing. Image segmentation is a technology that decomposes images into regions with different characteristics and extracts useful targets. It can be regarded as a combinatorial optimization problem.
Image enhancement plays an important role in improving image quality in the field of image processing, which is achieved by highlighting useful information and suppressing redundant information in the image. In this paper, the development of image enhancement algorithms is surveyed. The purpose of our review is to provide relevant researchers with a comprehensive and systematic analysis on ...
In this paper we give a tutorial overview of the field of digital image processing. Following a brief discussion of some basic concepts in this area, image processing algorithms are presented with emphasis on fundamental techniques which are broadly applicable to a number of applications. In addition to several real-world examples of such techniques, we also discuss the applicability of ...
With the development of information technology, people access information more and more rely on the network, and more than 80% of the information in the network is replaced by multimedia technology represented by images. Therefore, the research on image processing technology is very important, but most of the research on image processing technology is focused on a certain aspect. The research ...
The image classification is a classical problem of image processing, computer vision and machine learning fields. In this paper we study the image classification using deep learning.
With the continuous development of computer technology, computer image processing technology has become an indispensable part of modern society. Computer image processing technology mainly includes image acquisition, image enhancement, image compression, image recognition and so on. In this process, intelligent optimization algorithm plays a very important role. This paper will introduce the ...
Abstract. The image processing techniques plays vital role on image Acquisition, image pre-processing, Clustering, Segmentation and Classification techniques with different kind of images such as Fruits, Medical, Vehicle and Digital text images etc. In this study the various images to remove unwanted noise and performs enhancement techniques ...