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检索条件"任意字段=4th Conference on Mathematics of Image and Data Coding, Compression, and Encryption"

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Wavelet zero-path mapping algorithm for multimedia images coding 4

Wavelet zero-path mapping algorithm for multimedia images co...

引用

4th National conference on Telecommunication Technology (NCTT 2003)

作者： Teow, M Tan, R HELP Inst Dept Informat Technol Kuala Lumpur 50490 Malaysia

ISBN: (纸本)0780377737

In the age of information and communication technology (ICT), the requirements of multimedia images transmission are essential. image compression (source coding) has been provided significant improvements of communication bandwidth, and transmission cost and data rate. the objective of this paper is to develop new techniques for strengthening the compression of still images. the features of the proposed algorithm include: (i) wavelet transform engine, which provide better image compression rate and visual quality as compare to DCT-based system (JPEG), (ii) Zero-path exploit the cross-scale self-similarity of wavelet coefficients thus provides Zero-path compression, (iii) with the absent of side information (significant map) for coding and decoding of Zero-tree structure hence reduces data bit for significant map symbolic coding (iv) Adaptive Arithmetic Entropy coding provides further compression on generating variable-length code-words. Experimental results show that the proposed algorithm outperforms both JPEG and the EZW algorithms in terms of Peak Signal-to-Noise Ratio (PSNR), data compression bit-rate (bpp), and as well the human vision perception.

关键词： multimedia communication image coding wavelet analysis

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Quadrature-based structure with refined context-based entropy coding for subband image compression 4

Quadrature-based structure with refined context-based entrop...

引用

Joint conference of the 4th International conference on Information, Communications and Signal Processing and 4th Pacific-Rim conference on Multimedia, ICICS-PCM 2003

作者： De Silva, Liyanage C. Zhenyin, Li Institute of Information Science and Technology Massey University New Zealand Department of Electrical and Computer Engineering National University of Singapore Singapore

ISBN: (纸本)0780381858

In this paper, we propose a simple subband image compression scheme using wavelet decomposition. the proposed coding scheme employs a multi-level dyadic wavelet decomposition, organizes and orders the resultant wavelet coefficients using pre-determined quadtree data structure, and finally encode symbols by arithmetic coding with pre-designed context information. Despite the simplicity of the scheme, the experimental result shows it is competitive with the presently available schemes when compared with various types of test images. © 2003 IEEE.

关键词： Wavelet decomposition

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Autosophy still image compression

Autosophy still image compression

引用

4th Internet Imaging conference

作者： Holtz, K Holtz, E Kalienky, D Autosophy San Francisco CA USA

ISBN: (纸本)0819448184

A new image compression format is being developed to replace the gif and tif formats for Internet image transmission. Based on the Autosophy information theory, the new format is especially suited to the Internet. Features include much higher compression ratios, improved resistance to the Internet's Quality of Service (QoS) problems, a universal hardware-independent communication format, and optional "codebook" encryption for secure communications. the all 16 bit data format allows the mixing of other Internet data types (including live video, sound, text, and random bit files) within a universal communication protocol. Encoding speed is less than a second per image. Hardware chipsets are necessary for real-time encoding speed, but real-time retrieval can be achieved using software only. Conventional lossless image compression formats use the dynamically growing tree libraries of the LZW code. that yields minimal compression for small images and creates great sensitivity to transmission effors. the new image compression format, in contrast, uses a fixed -- pre-grown -- hyperspace pattern library. that provides much higher compression ratios, increased error resistance, and even optional encryption. the same algorithms can provide either "lossless" compression according to the Shannon theory or "visually lossless" compression according to the Autosophy theory.

关键词： autosophy internet imaging image compression information theory gif format tif format encryption

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Lossless fractal image coding 4

Lossless fractal image coding

引用

4th EURASIP conference on Video, image Processing and Multimedia Communications

作者： Prachumrak, K Hiramatsu, A Fuchida, T Nakamura, H Murashima, S Kagoshima Univ Fac Engn Dept Informat & Comp Sci Kagoshima Japan

ISBN: (纸本)9531840547

Lossless Fractal image coding (LFIC) is a new method to code images. the significant property of this method is that it is the first simple fractal image coding method that can regenerate images without data loss (lossless). the method, different from the other fractal image compression [1][2], needs no search for matched domain-range. therefore, the coding time of this method is also very fast compared with the other fractal image compression methods.

关键词： lossless fractal image coding no-time-consuming

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Effects of scaling and residual mapping parameters on lossless compression of images 4

Effects of scaling and residual mapping parameters on lossle...

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4th EURASIP conference on Video, image Processing and Multimedia Communications

作者： Knezovic, J Kovac, M Univ Zagreb Fac Elect Engn & Comp HR-10000 Zagreb Croatia

ISBN: (纸本)9531840547

Entropy coding algorithms assign variable length codes to the input data (symbols) based on their statistical properties. those techniques are used in both lossless and lossy compression systems. this article presents scaling and residual mapping parameters in coding scheme and their effect on compression of images. In our experiments these entropy coding techniques have been incorporated in simple DPCM based lossless compressor.

关键词： image compression entropy coding arithmetic codes Golomb-Rice codes Huffman codes scaling residual mapping

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Efficient post-processing for block-based compressed video 4

Efficient post-processing for block-based compressed video

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4th EURASIP conference on Video, image Processing and Multimedia Communications

作者： Kim, Y Yi, T Yeungnam Univ Sch Elect Engn & Comp Sci Gyeongsangbuk 712749 South Korea

ISBN: (纸本)9531840547

In digital video coding, the 2-D block-based Discrete Cosine Transform (DCT) has been widely used, combined with the quantization techniques of DCT coefficients, for the purpose of compression of video data. Video compression algorithms using this block-based transform coding method cause the blocking and ringing artifacts in the reconstructed images of a video sequence. In this paper, we propose the efficient post-processing algorithm for coded video sequence, where the ringing effects near sharp edges are smoothed out and the blocking effects are removed without blurring the edge regions at the decoder the simulation examples of processing images coded by MPEG-2 are presented to demonstrate that a significant improvement has been achieved.

关键词： post-processing image compression

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VLSI design of a DWT/modified efficient SPIHT based image codec 4

VLSI design of a DWT/modified efficient SPIHT based image co...

引用

Joint conference of the 4th International conference on Information, Communications and Signal Processing and 4th Pacific-Rim conference on Multimedia, ICICS-PCM 2003

作者： Huang, Win-Bin Chang, Yuan-Jui Su, Alvin W.Y. Kuo, Yau-Hwang Dept. of Computer Science and Information Engineering National Cheng-Kung University Taiwan China

ISBN: (纸本)0780381858

Set Partitioning in Hierarchical Trees (SPIHT) is a highly efficient technique for compressing Discrete Wavelet Transform (DWT) decomposed images. though its compression efficiency is a little less than famous Embedded Block coding with Optimized Truncation (EBCOT) adopted by JPEG2000, a codec standard for still images, SPIHT has a straightforward coding procedure and requires no tables. these make SPIHT a more appropriate algorithm for hardware implementation. In this paper, a modified SPIHT algorithm is presented. the modifications include a simplification of coefficient scanning process, a 1-D addressing method instead of the original 2-D arrangement for wavelet coefficients and a fixed memory allocation for the data lists instead of a dynamic allocation required in the original SPIHT. though distortion is slightly increased, it enjoys an extremely fast throughput and easier hardware implementation. the gate counts of a 16-by-16 DWT/IDWT and a modified SPIHT/Inv-SPIHT are 12,458 and 5,758 respectively. A complete image codec is also provided. © 2003 IEEE.

关键词： Discrete wavelet transforms

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Orientation scanning to improve lossless compression of fingerprint images

引用

4th International conference on Audio- and Video-Based Biometric Person Authentication

作者： thärnå, J Nilsson, K Bigun, J Halmstad Univ Sch Informat Sci Comp & Elect Engn IDE S-30118 Halmstad Sweden

ISBN: (纸本)3540403027

While standard compression methods available include complex source encoding schemes, the scanning of the image is often performed by a horizontal (row-by-row) or vertical scanning. In this work a new scanning method, called ridge scanning, for lossless compression of fingerprint images is presented. By using ridge scanning our goal is to increase the redundancy in data and thereby increase the compression rate. By using orientations, estimated from the linear symmetry property of local neighbourhoods in the fingerprint, a scanning algorithm which follows the ridges and valleys is developed. the properties of linear symmetry axe also used for a segmentation of the fingerprint into two parts, one part which lacks orientation and one that has it. We demonstrate that ridge scanning increases the compression ratio for Lempel-Ziv coding as well as recursive Huffman coding with approximately 3% in average. Compared to JPEG-LS, using ridge scanning and recursive Huffman the gain is 10% in average.

关键词： Scanning

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Wavelet zero-path mapping algorithm for multimedia images coding

Wavelet zero-path mapping algorithm for multimedia images co...

引用

National conference on Telecommunication Technology (NCTT)

作者： M. Teow R. Tang Department of Information Technology HELP Institute Kuala Lumpur Malaysia

In the age of information and communication technology (ICT), the requirements of multimedia image transmission are essential. image compression (source coding) has provided significant improvements for communication bandwidth, and transmission cost and data rate. the objective of the paper is to develop new techniques for strengthening the compression of still images. the features of the proposed algorithm include: (i) a wavelet transform engine, which provides a better image compression rate and visual quality as compared to DCT-based systems (JPEG); (ii) zero-path which exploits the cross-scale self-similarity of wavelet coefficients and thus provides zero-path compression; (iii) the absence of side information (significant map) for coding and decoding of zero-tree structure hence reduces the data bits for significant map symbolic coding; (iv) adaptive arithmetic entropy coding provides further compression on generating variable-length codewords. Experimental results show that the proposed algorithm outperforms both JPEG and the EZW (embedded zerotree wavelet) algorithms in terms of peak signal-to-noise ratio (PSNR), data compression bit-rate (bpp), and also human visual perception.

关键词： image coding Transform coding PSNR Communications technology image communication Source coding Bandwidth Costs Wavelet transforms Engines

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Effects of scaling and residual mapping parameters on lossless compression of images

Effects of scaling and residual mapping parameters on lossle...

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IEEE Region 8 International Symposium on Video/image Processing and Multimedia Communications (EURASIP)

作者： J. Knezovic M. Kovac Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

Entropy coding algorithms assign variable length codes to the input data (symbols) based on their statistical properties. those techniques are used in both lossless and lossy compression systems. this article presents scaling and residual mapping parameters in coding schemes and their effect on compression of images. In our experiments these entropy coding techniques have been incorporated in simple DPCM based lossless compressor.

关键词： image coding Entropy coding Predictive models Arithmetic Probability Redundancy Buildings image processing Biomedical imaging Satellite communication

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