期刊文献+
共找到1,081篇文章
< 1 2 55 >
每页显示 20 50 100
A Compression Algorithm of Hyperspectral Remote Sensing Image Based on 3-D Wavelet-Fractal Coder
1
作者 邹毅 潘伟 敖露 《Journal of Donghua University(English Edition)》 EI CAS 2010年第2期229-232,共4页
In this paper, the 3-D Wavelet-Fractal coder was used to compress the hyperspectral remote sensing image, which is a combination of 3-D improved set partitioning in hierarchical trees (SPIHT) coding and 3-D fractal ... In this paper, the 3-D Wavelet-Fractal coder was used to compress the hyperspectral remote sensing image, which is a combination of 3-D improved set partitioning in hierarchical trees (SPIHT) coding and 3-D fractal coding. Hyperspectral image date cube was first translated by 3-D wavelet and the 3-D fractal compression ceding was applied to lowest frequency subband. The remaining coefficients of higher frequency sub-bands were encoding by 3-D improved SPIHT. We used the block set instead of the hierarchical trees to enhance SPIHT's flexibility. The classical eight kinds of affme transformations in 2-D fractal image compression were generalized to nineteen for the 3-D fractal image compression. The new compression method had been tested on MATLAB. The experiment results indicate that we can gain high compression ratios and the information loss is acceptable. 展开更多
关键词 image compression three dimensional improved SPIHT fractal compression coding HYPERSPECTRaL
下载PDF
Low complexity DCT-based distributed source coding with Gray code for hyperspectral images 被引量:1
2
作者 Rongke Liu Jianrong Wang Xuzhou Pan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第6期927-933,共7页
To compress hyperspectral images, a low complexity discrete cosine transform (DCT)-based distributed source coding (DSC) scheme with Gray code is proposed. Unlike most of the existing DSC schemes, which utilize tr... To compress hyperspectral images, a low complexity discrete cosine transform (DCT)-based distributed source coding (DSC) scheme with Gray code is proposed. Unlike most of the existing DSC schemes, which utilize transform in spatial domain, the proposed algorithm applies transform in spectral domain. Set-partitioning-based approach is applied to reorganize DCT coefficients into waveletlike tree structure and extract the sign, refinement, and significance bitplanes. The extracted refinement bits are Gray encoded. Because of the dependency along the line dimension of hyperspectral images, low density paritycheck-(LDPC)-based Slepian-Wolf coder is adopted to implement the DSC strategy. Experimental results on airborne visible/infrared imaging spectrometer (AVIRIS) dataset show that the proposed paradigm achieves up to 6 dB improvement over DSC-based coders which apply transform in spatial domain, with significantly reduced computational complexity and memory storage. 展开更多
关键词 image compression hyperspectral images distributed source coding (DSC) discrete cosine transform (DCT) Gray code band-interleaved-by-pixel (BIP).
下载PDF
Edge Oriented Compression Coding on Image Sequence 被引量:1
3
作者 ZHANG Zhao yang GAO Lei ZHANG Ying CHEN Hao (School of Communication and Information Engineering, Shanghai University) 《Advances in Manufacturing》 SCIE CAS 1999年第3期208-213,共6页
An edge oriented image sequence coding scheme is presented. On the basis of edge detecting, an image could be divided into the sensitized region and the smooth region. In this scheme, the architecture of sensitized r... An edge oriented image sequence coding scheme is presented. On the basis of edge detecting, an image could be divided into the sensitized region and the smooth region. In this scheme, the architecture of sensitized region is approximated with linear type of segments. Then a rectangle belt is constructed for each segment. Finally, the gray value distribution in the region is fitted by normal forms polynomials. The model matching and motion analysis are also based on the architecture of sensitized region. For the smooth region we use the run length scanning and linear approximating. By means of normal forms polynomial fitting and motion prediction by matching, the images are compressed. It is shown through the simulations that the subjective quality of reconstructed picture is excellent at 0.0075 bit per pel. 展开更多
关键词 video coding image compression very low bit rate edge oriented coding
下载PDF
Second Generation Wavelet Applied to Lossless Compression Coding of Image 被引量:1
4
作者 Yan Tang Yu-long Mo 《Advances in Manufacturing》 2000年第3期225-229,共5页
In this paper, the second generation wavelet transform is applied to image lossless coding, according to its characteristic of reversible integer wavelet transform. The second generation wavelet transform can provide ... In this paper, the second generation wavelet transform is applied to image lossless coding, according to its characteristic of reversible integer wavelet transform. The second generation wavelet transform can provide higher compression ratio than Huffman coding while it reconstructs image without loss compared with the first generation wavelet transform. The experimental results show that the se cond generation wavelet transform can obtain excellent performance in medical image compression coding. 展开更多
关键词 wavelet transform integer wavelet image compression lossless coding
下载PDF
AN EFFICIENT BTC IMAGE COMPRESSION ALGORITHM
5
作者 陆哲明 徐润生 孙圣和 《Journal of Shanghai Jiaotong university(Science)》 EI 2000年第2期121-124,共4页
Block truncation coding (BTC) is a simple and fast image compression technique suitable for real time image transmission, and it has high channel error resisting capability and good reconstructed image quality. The ma... Block truncation coding (BTC) is a simple and fast image compression technique suitable for real time image transmission, and it has high channel error resisting capability and good reconstructed image quality. The main shortcoming of the original BTC algorithm is the high bit rate (normally 2 bits/pixel). In order to reduce the bit rate, an efficient BTC image compression algorithm was presented in this paper. In the proposed algorithm, a simple look up table method is presented for coding the higher mean and the lower mean of a block without any extra distortion, and a prediction technique is introduced to reduce the number of bits used to code the bit plane with some extra distortion. The test results prove the effectiveness of the proposed algorithm. 展开更多
关键词 BLOCK TRUNCaTION CODING image compression document code:a
下载PDF
An efficient BTC image compression algorithm with visual patterns
6
作者 陆哲明 潘正祥 孙圣和 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2000年第3期62-65,共4页
Discusses block truncation coding (BTC) a simple and fast image compression technique suitable for real time image transmission with high channel error resisting capability and good reconstructed image quality, and it... Discusses block truncation coding (BTC) a simple and fast image compression technique suitable for real time image transmission with high channel error resisting capability and good reconstructed image quality, and its main drawback of high bit rate of 2 bits/pixel for a 256 gray image for the purpose of reducing the bit rate, and introduces a simple look up table method for coding the higher mean and the lower mean of a block, and a set of 24 visual patterns used to encode 4×4 bit plane of the high detail block and proposes a new algorithm, when needs only 19 bits to encode 4×4 high detail block and 12 bits to encode the 4×4 low detail block. 展开更多
关键词 BLOCK TRUNCaTION CODING VISUaL PaTTERNS image compression
下载PDF
An efficient adaptive arithmetic coding image compression technology
7
作者 王兴元 云娇娇 张永雷 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第10期239-245,共7页
This paper proposes an efficient lossless image compression scheme for still images based on an adaptive arithmetic coding compression algorithm. The algorithm increases the image coding compression rate and ensures t... This paper proposes an efficient lossless image compression scheme for still images based on an adaptive arithmetic coding compression algorithm. The algorithm increases the image coding compression rate and ensures the quality of the decoded image combined with the adaptive probability model and predictive coding. The use of adaptive models for each encoded image block dynamically estimates the probability of the relevant image block. The decoded image block can accurately recover the encoded image according to the code book information. We adopt an adaptive arithmetic coding algorithm for image compression that greatly improves the image compression rate. The results show that it is an effective compression technology. 展开更多
关键词 arithmetic coding aDaPTIVE image compression
下载PDF
METHOD OF VECTOR QUANTIZATION CODING USING RECTANGULAR TRANSFORM FOR IMAGE COMPRESSION
8
作者 汪凯 宋国文 《Journal of Electronics(China)》 1990年第4期289-295,共7页
First of all a simple and practical rectangular transform is given,and then thevector quantization technique which is rapidly developing recently is introduced.We combinethe rectangular transform with vector quantizat... First of all a simple and practical rectangular transform is given,and then thevector quantization technique which is rapidly developing recently is introduced.We combinethe rectangular transform with vector quantization technique for image data compression.Thecombination cuts down the dimensions of vector coding.The size of the codebook can reasonablybe reduced.This method can reduce the computation complexity and pick up the vector codingprocess.Experiments using image processing system show that this method is very effective inthe field of image data compression. 展开更多
关键词 image processing RECTaNGULaR TRaNSFORM VECTOR QUaNTIZaTION Data compression CODING
下载PDF
Novel region-based image compression method based on spiking cortical model
9
作者 Rongchang Zhao Yide Ma 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第1期161-171,共11页
To get the high compression ratio as well as the high-quality reconstructed image, an effective image compression scheme named irregular segmentation region coding based on spiking cortical model(ISRCS) is presented... To get the high compression ratio as well as the high-quality reconstructed image, an effective image compression scheme named irregular segmentation region coding based on spiking cortical model(ISRCS) is presented. This scheme is region-based and mainly focuses on two issues. Firstly, an appropriate segmentation algorithm is developed to partition an image into some irregular regions and tidy contours, where the crucial regions corresponding to objects are retained and a lot of tiny parts are eliminated. The irregular regions and contours are coded using different methods respectively in the next step. The other issue is the coding method of contours where an efficient and novel chain code is employed. This scheme tries to find a compromise between the quality of reconstructed images and the compression ratio. Some principles and experiments are conducted and the results show its higher performance compared with other compression technologies, in terms of higher quality of reconstructed images, higher compression ratio and less time consuming. 展开更多
关键词 data compaction and compression image processing and computer vision region-based image coding neural network
下载PDF
Screen image sequence compression method utilizing adaptive block size coding and hierarchical GOP structure
10
作者 武星 梅亮 +2 位作者 袭奇 张申生 陈延伟 《Journal of Central South University》 SCIE EI CAS 2010年第4期786-794,共9页
To compress screen image sequence in real-time remote and interactive applications,a novel compression method is proposed.The proposed method is named as CABHG.CABHG employs hybrid coding schemes that consist of intra... To compress screen image sequence in real-time remote and interactive applications,a novel compression method is proposed.The proposed method is named as CABHG.CABHG employs hybrid coding schemes that consist of intra-frame and inter-frame coding modes.The intra-frame coding is a rate-distortion optimized adaptive block size that can be also used for the compression of a single screen image.The inter-frame coding utilizes hierarchical group of pictures(GOP) structure to improve system performance during random accesses and fast-backward scans.Experimental results demonstrate that the proposed CABHG method has approximately 47%-48% higher compression ratio and 46%-53% lower CPU utilization than professional screen image sequence codecs such as TechSmith Ensharpen codec and Sorenson 3 codec.Compared with general video codecs such as H.264 codec,XviD MPEG-4 codec and Apple's Animation codec,CABHG also shows 87%-88% higher compression ratio and 64%-81% lower CPU utilization than these general video codecs. 展开更多
关键词 screen image sequence compression adaptive block size hierarchical GOP structure intra-frame coding inter-frame coding
下载PDF
An image compression method for space multispectral time delay and integration charge coupled device camera
11
作者 李进 金龙旭 张然峰 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第6期360-365,共6页
Multispectral time delay and integration charge coupled device (TDICCD) image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Cons... Multispectral time delay and integration charge coupled device (TDICCD) image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Consultative Committee for Space Data Systems (CCSDS) has proposed an image data compression (CCSDS-IDC) algorithm which is so far most widely implemented in hardware. However, it cannot reduce spectral redundancy in mukispectral images. In this paper, we propose a low-complexity improved CCSDS-IDC (ICCSDS-IDC)-based distributed source coding (DSC) scheme for multispectral TDICCD image consisting of a few bands. Our scheme is based on an ICCSDS-IDC approach that uses a bit plane extractor to parse the differences in the original image and its wavelet transformed coefficient. The output of bit plane extractor will be encoded by a first order entropy coder. Low-density parity-check-based Slepian-Wolf (SW) coder is adopted to implement the DSC strategy. Experimental results on space multispectral TDICCD images show that the proposed scheme significantly outperforms the CCSDS-IDC-based coder in each band. 展开更多
关键词 multispectral CCD images Consultative Committee for Space Data Systems - image data compression (CCSDS-IDC) distributed source coding (DSC)
下载PDF
Complete Focal Plane Compression Based on CMOS Image Sensor Using Predictive Coding
12
作者 姚素英 于潇 +1 位作者 高静 徐江涛 《Transactions of Tianjin University》 EI CAS 2015年第1期83-89,共7页
In this paper, a CMOS image sensor(CIS) is proposed, which can accomplish both decorrelation and entropy coding of image compression directly on the focal plane. The design is based on predictive coding for image deco... In this paper, a CMOS image sensor(CIS) is proposed, which can accomplish both decorrelation and entropy coding of image compression directly on the focal plane. The design is based on predictive coding for image decorrelation. The predictions are performed in analog domain by 2×2 pixel units. Both the prediction residuals and original pixel values are quantized and encoded in parallel. Since the residuals have a peak distribution around zero,the output codewords can be replaced by the valid part of the residuals' binary mode. The compressed bit stream is accessible directly at the output of CIS without extra disposition. Simulation results show that the proposed approach achieves a compression rate of 2. 2 and PSNR of 51 on different test images. 展开更多
关键词 CMOS image sensor focal plane compression predictive coding entropy coder
下载PDF
A New Method Which Combines Arithmetic Coding with RLE for Lossless Image Compression
13
作者 Med Karim Abdmouleh Atef Masmoudi Med Salim Bouhlel 《Journal of Software Engineering and Applications》 2012年第1期41-44,共4页
This paper presents a new method of lossless image compression. An image is characterized by homogeneous parts. The bit planes, which are of high weight are characterized by sequences of 0 and 1 are successive encoded... This paper presents a new method of lossless image compression. An image is characterized by homogeneous parts. The bit planes, which are of high weight are characterized by sequences of 0 and 1 are successive encoded with RLE, whereas the other bit planes are encoded by the arithmetic coding (AC) (static or adaptive model). By combining an AC (adaptive or static) with the RLE, a high degree of adaptation and compression efficiency is achieved. The proposed method is compared to both static and adaptive model. Experimental results, based on a set of 12 gray-level images, demonstrate that the proposed scheme gives mean compression ratio that are higher those compared to the conventional arithmetic encoders. 展开更多
关键词 adaptive aRITHMETIC CODING Static aRITHMETIC CODING aRITHMETIC CODING LOSSLESS compression image RUN Length ENCODING
下载PDF
Lossy-to-Lossless Compression of Hyperspectral Image Using the 3D Set Partitioned Embedded ZeroBlock Coding Algorithm
14
作者 Ying Hou 《Journal of Software Engineering and Applications》 2009年第2期86-95,共10页
In this paper, we propose a three-dimensional Set Partitioned Embedded ZeroBlock Coding (3D SPEZBC) lossy-to-lossless compression algorithm for hyperspectral image which is an improved three-dimensional Embedded ZeroB... In this paper, we propose a three-dimensional Set Partitioned Embedded ZeroBlock Coding (3D SPEZBC) lossy-to-lossless compression algorithm for hyperspectral image which is an improved three-dimensional Embedded ZeroBlock Coding (3D EZBC) algorithm. The algorithm adopts the 3D integer wavelet packet transform proposed by Xiong et al. to decorrelate, the set-based partitioning zeroblock coding to process bitplane coding and the con-text-based adaptive arithmetic coding for further entropy coding. The theoretical analysis and experimental results demonstrate that 3D SPEZBC not only provides the same excellent compression performances as 3D EZBC, but also reduces the memory requirement compared with 3D EZBC. For achieving good coding performance, the diverse wave-let filters and unitary scaling factors are compared and evaluated, and the best choices were given. In comparison with several state-of-the-art wavelet coding algorithms, the proposed algorithm provides better compression performance and unsupervised classification accuracy. 展开更多
关键词 image compression HYPERSPECTRaL image 3D WaVELET PaCKET Transforms Zeroblock CODING
下载PDF
A New Approach Based on Set Partitioning in Hierarchical Tree Algorithm for Image Compression
15
作者 Zitouni Athmane Baarir Zine Eddine +1 位作者 Ouafi Abd Elkarim Taleb Ahmed Abdelmalik 《Computer Technology and Application》 2011年第4期270-279,共10页
In this paper, the authors propose a new approach to image compression based on the principle of Set Partitioning in Hierarchical Tree algorithm (SPIHT). Our approach, the modified SPIHT (MSPIHT), distributes entr... In this paper, the authors propose a new approach to image compression based on the principle of Set Partitioning in Hierarchical Tree algorithm (SPIHT). Our approach, the modified SPIHT (MSPIHT), distributes entropy differently than SPIHT and also optimizes the coding. This approach can produce results that are a significant improvement on the Peak Signal-to-Noise Ratio (PSNR) and compression ratio obtained by SPIHT algorithm, without affecting the computing time. These results are also comparable with those obtained using the Embedded Zerotree Wavelet (EZW) and Joint Photographic Experts Group 2000 (JPG2) algorithms. 展开更多
关键词 image compression set partitioning in hierarchical tree (SPIHT) MSPIHT ENTROPY CODING peak signal-to-noise ratio (PSNR) compression ratio.
下载PDF
Medical Image Compression Using Wrapping Based Fast Discrete Curvelet Transform and Arithmetic Coding
16
作者 P. Anandan R. S. Sabeenian 《Circuits and Systems》 2016年第8期2059-2069,共11页
Due to the development of CT (Computed Tomography), MRI (Magnetic Resonance Imaging), PET (Positron Emission Tomography), EBCT (Electron Beam Computed Tomography), SMRI (Stereotactic Magnetic Resonance Imaging), etc. ... Due to the development of CT (Computed Tomography), MRI (Magnetic Resonance Imaging), PET (Positron Emission Tomography), EBCT (Electron Beam Computed Tomography), SMRI (Stereotactic Magnetic Resonance Imaging), etc. has enhanced the distinguishing rate and scanning rate of the imaging equipments. The diagnosis and the process of getting useful information from the image are got by processing the medical images using the wavelet technique. Wavelet transform has increased the compression rate. Increasing the compression performance by minimizing the amount of image data in the medical images is a critical task. Crucial medical information like diagnosing diseases and their treatments is obtained by modern radiology techniques. Medical Imaging (MI) process is used to acquire that information. For lossy and lossless image compression, several techniques were developed. Image edges have limitations in capturing them if we make use of the extension of 1-D wavelet transform. This is because wavelet transform cannot effectively transform straight line discontinuities, as well geographic lines in natural images cannot be reconstructed in a proper manner if 1-D transform is used. Differently oriented image textures are coded well using Curvelet Transform. The Curvelet Transform is suitable for compressing medical images, which has more curvy portions. This paper describes a method for compression of various medical images using Fast Discrete Curvelet Transform based on wrapping technique. After transformation, the coefficients are quantized using vector quantization and coded using arithmetic encoding technique. The proposed method is tested on various medical images and the result demonstrates significant improvement in performance parameters like Peak Signal to Noise Ratio (PSNR) and Compression Ratio (CR). 展开更多
关键词 Medical image compression Discrete Curvelet Transform Fast Discrete Curvelet Transform arithmetic Coding Peak Signal to Noise Ratio compression Ratio
下载PDF
Chaos-based encryption for fractal image coding 被引量:3
17
作者 袁正雄 黄国和 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期115-126,共12页
A chaos-based cryptosystem for fractal image coding is proposed. The Renyi chaotic map is employed to determine the order of processing the range blocks and to generate the keystream for masking the encoded sequence. ... A chaos-based cryptosystem for fractal image coding is proposed. The Renyi chaotic map is employed to determine the order of processing the range blocks and to generate the keystream for masking the encoded sequence. Compared with the standard approach of fraetal image coding followed by the Advanced Encryption Standard, our scheme offers a higher sensitivity to both plaintext and ciphertext at a comparable operating efficiency. The keystream generated by the Renyi chaotic map passes the randomness tests set by the United States National Institute of Standards and Technology, and so the proposed scheme is sensitive to the key. 展开更多
关键词 CHaOS CRYPTOGRaPHY joint image compression and encryption fractal image coding
下载PDF
An Adaptive Block-Based Fractal Image Coding Scheme
18
作者 邓元木 柯有安 《Journal of Beijing Institute of Technology》 EI CAS 1996年第2期183+177-183,共8页
Based on Jacquin's work. this paper presents an adaptive block-based fractal image coding scheme. Firstly. masking functions are used to classify range blocks and weight the mean Square error (MSE) of images. Seco... Based on Jacquin's work. this paper presents an adaptive block-based fractal image coding scheme. Firstly. masking functions are used to classify range blocks and weight the mean Square error (MSE) of images. Secondly, an adaptive block partition scheme is introduced by developing the quadtree partition method. Thirdly. a piecewise uniform quantization strategy is appled to quantize the luminance shifting. Finally. experiment results are shown and compared with what reported by Jacquin and Lu to verify the validity of the methods addressed by the authors. 展开更多
关键词 fractal technique image compression image coding
下载PDF
Recent Progress in Image Coding 被引量:5
19
作者 Fan ChangxinFan Changxin is with Xidian University, Professor,FCIC,FCIE,FIEE,FIEEE Lu ZhaoyangLu Zhaoyang is with Xidian University, Ph.D.,Associate Researcher (Xidian University, Xi’an 710071) 《通信学报》 EI CSCD 北大核心 1998年第5期57-62,共6页
RecentProgresinImageCodingFanChangxinLuZhaoyang(XidianUniversity,Xi’an710071)AbstractTheworksonimageco... RecentProgresinImageCodingFanChangxinLuZhaoyang(XidianUniversity,Xi’an710071)AbstractTheworksonimagecodinginrecenttwoye... 展开更多
关键词 图像编码 MPEG 图像处理
下载PDF
Formal Photograph Compression Algorithm Based on Object Segmentation 被引量:1
20
作者 Li Zhu Guo-You Wang Chen Wang 《International Journal of Automation and computing》 EI 2008年第3期276-283,共8页
Small storage space for photographs in formal documents is increasingly necessary in today's needs for huge amounts of data communication and storage. Traditional compression algorithms do not sufficiently utilize th... Small storage space for photographs in formal documents is increasingly necessary in today's needs for huge amounts of data communication and storage. Traditional compression algorithms do not sufficiently utilize the distinctness of formal photographs. That is, the object is an image of the human head, and the background is in unicolor. Therefore, the compression is of low efficiency and the image after compression is still space-consuming. This paper presents an image compression algorithm based on object segmentation for practical high-efficiency applications. To achieve high coding efficiency, shape-adaptive discrete wavelet transforms are used to transformation arbitrarily shaped objects. The areas of the human head and its background are compressed separately to reduce the coding redundancy of the background. Two methods, lossless image contour coding based on differential chain, and modified set partitioning in hierarchical trees (SPIHT) algorithm of arbitrary shape, are discussed in detail. The results of experiments show that when bit per pixel (bpp)is equal to 0.078, peak signal-to-noise ratio (PSNR) of reconstructed photograph will exceed the standard of SPIHT by nearly 4dB. 展开更多
关键词 image compression object segmentation lossless image contour coding differential chain set partitioning in hierarchical trees (SPIHT) coding of arbitrarily shaped object.
下载PDF
上一页 1 2 55 下一页 到第
使用帮助 返回顶部