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image compression algorithm FOR FAST PARALLEL THINNING OF BINARY imageS

ELECTRONICS LETTERS 1990年第14期26卷 1056-1058页

作者： HAYAT, L SANDLER, MB Dept. of Electron. & Electr. Eng. King's Coll. London London Univ. UK

An efficient image compression technique as a preprocessing step for skeletonisation is presented. For this purpose a 5*5 pattern window is used, in which an internal 3*3 nonoverlapping window does the compression whilst the outer ring of pixels helps to preserve the image connectivity during compression. Comparative evaluation based on experimental results, execution timings and quality of the skeleton obtained, show that this algorithm is faster and more efficient than many other existing thinning algorithms. This algorithm is also more efficient for noisy images than other thinning algorithms because it simultaneously performs median filtering operations.

关键词： 5*5 pattern window computerised picture processing data compression execution timings experimental results fast parallel thinning of binary images image compression algorithm image compression technique image connectivity internal 3*3 nonoverlapping window median filtering operations noisy images preprocessing step skeletonisation thinning algorithms

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A LOSSLESS image compression algorithm USING VARIABLE BLOCK SIZE SEGMENTATION

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IEEE TRANSACTIONS ON image PROCESSING 1995年第10期4卷 1396-1406页

作者： RANGANATHAN, N ROMANIUK, SG NAMUDURI, KR NATL UNIV SINGAPORE DEPT INFORMAT SYST & COMP SCISINGAPORE 0511SINGAPORE GTE INFORMAT SERV TAMPAFL 33602

The redundancy in digital image representation can be classified into two categories: local and global, In this paper, we present an analysis of two image characteristics that give rise to local and global redundancy in image representation, Based on this study, we propose a lossless image compression scheme that exploits redundancy both at local and global levels in order to obtain maximum compression efficiency, The proposed algorithm segments the image into variable size blocks and encodes them depending on the characteristics exhibited by the pixels within the block, The proposed algorithm is implemented in software and its performance is better than other lossless compression schemes such as the Huffman, the arithmetic, the Lempel-Ziv and the JPEG.

关键词： lossless image compression JPEG redundancy image representation pixel image compression algorithm variable block algorithms lossless compression

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Study of the Discrete Wavelet Transform Based on JPEG2000 image compression algorithm

Study of the Discrete Wavelet Transform Based on JPEG2000 Im...

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International Conference on Intelligent Materials and Mechatronics (IMM 2013)

作者： Cai, Jin Wang, Shuo Shenyang Aerosp Univ Coll Civil Aviat Shenyang 110136 Liaoning Peoples R China Shenyang Aerosp Univ Fac Aerosp Engn Shenyang 110136 Liaoning Peoples R China

ISBN: (纸本)9783037859353

JPEG 2000 is a new image coding system that uses state-of-the-art compression techniques based on wavelet technology. As interactive multimedia technologies evolve, the requirements for the file format used to store the image data continue to evolve. The size and bit depth collected for an image to increase the resolution and extend the dynamic range and color gamut. Discrete Wavelet transform based embedded image coding method is the basis of JPEG2000. image compression algorithm for the proper use and display of the image is a requirement for digital photography.

关键词： Discrete Wavelet Transform (DWT) JPEG2000 image compression algorithm

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A Novel Wavelet Based No-Search Fractal image compression algorithm: How to Use the Landscape Properties

A Novel Wavelet Based No-Search Fractal Image Compression Al...

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1st International eConference on Computer and Knowledge Engineering (ICCKE)

作者： Mobasher, Mohammad Tayarani-N, Mohammad-H Beheshti, Majid Mashhad Iran

ISBN: (纸本)9781467357135;9781467357128

Fractal image compression (FIC) problem is a combinatorial optimization problem which has recently become one of the most promising encoding technologies in the generation of compressed images. In order to exploit the information laid in Discrete Wavelet Transform (DWT) coefficients of the images, this paper proposes a novel wavelet based FIC method to both speed up the compression process and retain the quality of the retrieved images. In the proposed algorithm at first the wavelet coefficients of the image are extracted. Then according to the wavelet coefficients of the range blocks the search strategy for each range block is determined. For smooth blocks a no-search algorithm is applied. For the horizontal and vertical edges, if the no-search algorithm does not provide an appropriate result, the wavelet based search algorithm starts its search process. For vertical range blocks, just the vertical domain blocks and for horizontal range blocks, just the horizontal and for orthogonal range blocks just the orthogonal domain blocks are considered for the search process. In order to explain how such an algorithm works, some statistical analysis on the landscape of fractal image compression problem is performed on 8 different pictures with different textures. The proposed algorithm is compared with the GA-based and original version of fractal image compression algorithms and experimental results show improvement both in speed and the quality of the decoded images.

关键词： fractal image compression Search process image compression algorithm SEARCHING algorithm Horizon Wavelet coefficients images search strategies wavelets algorithms

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An Efficient Lossless image compression algorithm for External Memory Bandwidth Saving

An Efficient Lossless Image Compression Algorithm for Extern...

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Data compression Conference (DCC)

作者： Haibing, Yin Hongqi, Hu China Jiliang Univ 258 Xueyuan St Hangzhou 310018 Zhejiang Peoples R China Shilan Microelectron Ltd 8 Huanggushan Rd Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781479938827

Huge SDRAM memory access bandwidth is the performance bottleneck for high definition video coding. Lossless image compression is efficient method to solve this problem. image pixels are compressed before writing into SDRAM and decompressed after reading out from SDRAM. This work proposes a hardware-oriented lossless image compression algorithm, supporting block and line random access patterns flexibly.

关键词： External Memory Bandwidth Saving SDRAM high definition video coding SDRAM lossless compression lossless image compression image compression algorithm readout external memory Writing

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Research and application of image compression algorithm suitable for on-site image transmission of infrastructure 5

Research and application of image compression algorithm suit...

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5th International Conference on Mechanical, Control and Computer Engineering (ICMCCE)

作者： Wang Xiaoyan Zhang Limin Yang Bo Li Rui Chai Pei State Grid Shandong Elect Power Construct Co Jinan Shandong Peoples R China

ISBN: (纸本)9781665423144

At present, massive amounts of image data have been generated at the power construction site. Due to the limitation of power communication transmission bandwidth, it is necessary to improve the low bit rate, high compression ratio, and anti-interference of the image, which is very necessary for on-site management personnel under the premise of ensuring efficient information transmission. Aiming at the above problems, this paper proposes an improved algorithm based on Set Partitioning in Hierarchical Trees (SPIHT). Firstly, the feature value of the image is extracted, and then the wavelet encoding is performed to obtain the compressed image. Compared with the traditional multi-level tree ensemble splitting algorithm, experimental data show that the image compressed by this algorithm has better visual effects and higher peak signal-to-noise ratio. Therefore, the method can effectively improve the transmission performance of the on-site image of the infrastructure construction, and ultimately improve the efficiency of the on-site inspection for violations.

关键词： image compression algorithm image transmission data intelligent analysis case analysis

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A FAST AND LOW COMPLICATED image compression algorithm FOR PREDICTOR OF JPEG-LS

A FAST AND LOW COMPLICATED IMAGE COMPRESSION ALGORITHM FOR P...

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IEEE International Conference on Network Infrastructure and Digital Content

作者： Xie, Ying Jing, Xiaojun Sun, Songlin Hong, Linbi Beijing Univ Posts & Telecommun Beijing 100088 Peoples R China

ISBN: (纸本)9781424448982

In order to get a balance of compression quality, compression ratio and time efficiency, we exploit JPEG_LS prediction and context-based encoding, and propose another linear prediction and run length code model. And we give an innovative compression algorithm design to evaluate the performance of our proposed schema. We present the compression results using a large number of images compared with JPEG_LS. As a result, Our proposed schema obtains the same compression quality, an increasing compression speed as much as 150%-250%, at the expense of compression ratio decreasing of 20%-35%. Also our proposed algorithm has less Computational complexity. So it can be included that our proposed algorithm is more suitable for real-time and embedded applications than JPEG-LS.

关键词： image compression algorithm JPEG_LS linear prediction time efficiency

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New image compression algorithm using wavelet analysis 7

New image compression algorithm using wavelet analysis

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Visual Information Processing VII

作者： Cheng, TH Chen, CH Univ Massachusetts Dept Elect & Comp Engn N Dartmouth MA 02747 USA

ISBN: (纸本)0819428361

The conventional approach of using DCT (discrete cosine transform) which is Fourier based has been most popular in industry. The advantages and potentials of image compression using wavelet analysis are now being explored. In this paper a neu image compression algorithm based on wavelet analysis is presented that makes use of a lifting scheme and a modification of the 3-D subband coding. The exploitation of contexts in both space-time and space-space brings out an improved algorithm that is both performance effective and computationally efficient. The software system using this algorithm has the advantage that it is much more flexible and less costly than hardware systems. The new algorithm has been tested with the compression of traffic scene video with satisfactory results.

关键词： image compression algorithm 3-D subband coding lifting algorithm contextual information intelligent transportation systems

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An image compression algorithm using reordered wavelet coefficients with compressive sensing

An image compression algorithm using reordered wavelet coeff...

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International Conference on image Processing Theory, Tools and Applications

作者： Mohamed Deriche Muhammad Ali Qureshi Azeddine Beghdadi King Fahd University of Petroleum and Minerals L2TI Institut Galilee Universite Paris 13

ISBN: (纸本)9781479986385

In this paper, we propose a new approach for image compression based on compressive sensing (CS). We introduce a new formulation of sparse vectors for rearranging multilevel 2-D Wavelet coefficients into a structured manner using parent-child relationships. We then use a Gaussian measurement matrix normalized with the weighted average Root Mean Squared (RMS) energies of different wavelet subbands. Compressed sampling is finally performed using this normalized measurement matrix. At the decoding stage, the image is reconstructed using a simple l_1-minimization technique. The proposed wavelet-based CS compression results in performance increase compared to other conventional CS-based techniques. Our experimental results show that the proposed algorithm outperforms existing approaches over different natural images.

关键词： Discrete wavelet transform Compressed sensing Adaptive sampling image quality compression Compressed sensing Resampling discrete wavelet transform image compression algorithm Wavelet coefficients image quality measurement matrix compression Parent Child Relations image compression Data compression

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A FAST AND LOW COMPLICATED image compression algorithm FOR PREDICTOR OF JPEG-LS

A FAST AND LOW COMPLICATED IMAGE COMPRESSION ALGORITHM FOR P...

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2009 IEEE International Conference on Network Infrastructure and Digital Content(2009年IEEE网络基础设施与数字内容国际会议 IEEE IC-NIDC2009)

作者： Ying Xie Xiaojun Jing Songlin Sun Linbi Hong Beijing University of Posts and Telecommunications Beijing

In order to get a balance of compression quality, compression ratio and time efficiency, we exploit JPEG_LS prediction and context-based encoding, and propose another linear prediction and run length code model. And we give an innovative compression algorithm design to evaluate the performance of our proposed schema. We present the compression results using a large number of images compared with JPEG_LS. As a result, our proposed schema obtains the same compression quality, an increasing compression speed as much as 150%-250%, at the expense of compression ratio decreasing of 20%-35%. Also our proposed algorithm has less computational complexity. So it can be included that our proposed algorithm is more suitable for real-time and embedded applications than JPEG-LS.

关键词： image compression algorithm JPEG_LS linear prediction time efficiency

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