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3rd International Symposium on Communications, Control, and Signal Processing (ISCCSP 2008), vol.3

作者： Jeonhak Moon Seongsoo Lee School of Electronic Engineering Soongsil University Seoul South Korea

This paper proposes an H.264/AVC entropy decoder without embedded processor or internal ROM/RAM memories. Conventional H.264/AVC entropy decoders have large internal ROM/RAM memories in context-adaptive variable length decoder. This requires special ROM/RAM fabrication process, which is difficult to be implemented in general digital logic fabrication process. Furthermore, they require embedded processors for bitstream manipulation, which increases area and power consumption. This paper proposes hardwired H.264/AVC entropy decoder without embedded processor, which improves data processing speed and reduces power consumption. Furthermore, it exploits optimized lookup tables and internal buffers without internal ROM/RAM, which reduces hardware size and can be implemented in general digital logic fabrication process. Designed entropy decoder was embedded in H.264/AVC video decoder, and it was verified to operate correctly in the system. It supports QCIF, CIF, QVGA, and VGA format, and its maximum operation frequency is 125MHz.

关键词： variable length coding Entropy Decoder CAVLC Exponential Golomb H.264/AVC

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Hybrid object-based video compression scheme using a novel content-based automatic segmentation algorithm

Hybrid object-based video compression scheme using a novel c...

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IEEE International Conference on Communications (ICC 2007)

作者： Tsoligkas, N. A. Xu, D. French, I. Univ Teesside Sch Sci & Technol Middlesbrough TS1 3BA Cleveland England

ISBN: (纸本)9781424403523

This paper describes a hybrid object-based video coding scheme that achieves efficient compression by separating moving objects from stationary background and transmitting the shape, motion and residuals for each segmented object. In this scheme, a new content-based object segmentation algorithm is proposed, which does not assume any prior modeling of the objects being segmented. The binarization process, which finds large object regions, is based on a threshold function that calculates block histograms and takes image noise into account. The resultant binary mask is further processed using morphological operations. The motion vectors are estimated inside the change detection mask using block-matching method between two successive frames, and then the dense motion field is estimated using the motion vectors and the Horn-Schunck algorithm.

关键词： content-based video coding object segmentation motion estimation motion compensation motion failure area variable length coding

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Test Compression/Decompression Based on JPEG VLC Algorithm

Test Compression/Decompression Based on JPEG VLC Algorithm

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The 16th Asian Test Symposium(第十六届亚洲测试学术会议)

作者： Hideyuki Ichihara Yukinori Setohara Yusuke Nakashima Tomoo Inoue Graduate School of Information Sciences Hiroshima City University 3-4-1 Ozuka-higashi Asaminami-ku Hiroshima 731-3194 Japan

Test data compression/decompression schemes for testing SoCs can reduce test application cost. A drawback of the previous schemes, however, is that a decompressor must be embedded in an SoC under test. In this paper, we target the testing of SoCs with multimedia cores and introduce a scheme of test compression/decompression with the decoding function in the multimedia cores. This scheme can utilize the decoder and encoder in a multimedia core for compressing and decompressing test data, and consequently it requires slight hardware overhead. As an example of the proposed scheme, we focus on a lossless variable-length coding (VLC) in the JPEG algorithm, and propose a test compression/decompression method using the VLC decoder. We also propose a test generation method for this scheme. Experimental results show that the test compression with the VLC can achieve high compression ratio and the proposed test generation method can increase the compression ratio.

关键词： Test compression multimedia core variable length coding JPEG test generation test transformation

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Multiple-symbol parallel CAVLC decoder for H.264/AVC

Multiple-symbol parallel CAVLC decoder for H.264/AVC

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IEEE Asia Pacific Conference on Circuits and Systems

作者： Wen, Ya-Nan Wu, Guan-Lin Chen, Sao-Jie Hu, Yu-Hen Natl Taiwan Univ Grad Inst Elect Engn Dept Elect Engn Taipei 106 Taiwan Univ Wisconsin Dept Elect & Comp Engn Madison WI 53706 USA

ISBN: (纸本)9781424403868

In this paper, we propose a novel high-throughput, ASIC architecture to realize the context-adaptive variable-length decoder (CAVLC) of H.264/AVC baseline profile. We conduct a thorough analysis of inherent parallelism of the CAVLC algorithm and identify particular steps that will benefit from parallel computing. In particular, we adopt a bit-position VLC decoding approach to decode multiple symbols concurrently in a critical step in CAVLC. This modification leads to almost 40% reduction of clock cycles compared to a straight-forward implementation.

关键词： H.264 entropy coding CAVLC variable length coding multiple-symbol

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Enhanced SLCCA image compression

Enhanced SLCCA image compression

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8th IEEE Workshop on Multimedia Signal Processing

作者： Zhuang, Xinhua Guo, Shu-Mei Lee, Wei-Nong Univ Missouri Columbia MO 65211 USA Natl Cheng Kung Univ Hosp Comp Sci & Informat Engn Tainan Taiwan

ISBN: (纸本)9780780397514

The principle and theory of SLCCA (Significance Linked Connected Component Analysis) coding technology has been further studied in this paper. To enhance SLCCA, we introduce distance-first significance-linked connected component analysis and a combined extension and arithmetic code for symbol sequence. An enhanced SLCCA coding system is constructed. Its PSNR performance is compared with both SLCCA and JPEG2000 on numerous 512x512 gray-scale natural images at three different bit rates, i.e., 0.3, 0.6 and 0.9 bits per pixel. On average, SLCCA+ is superior to SLCCA by 0.45 dB and significantly outperforms JPEG2000 by 3.69 dB. Detailed algorithm and further improvement will be given in a separate paper.

关键词： discrete wavelet transformation significance linked connected component analysis run length coding variable length coding extension code context based arithmetic coding

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Fast prefix code processing

Fast prefix code processing

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International Conference on Information Technology - coding and Computing

作者： Pajarola, R Univ Calif Irvine Irvine CA 92717 USA

ISBN: (纸本)0769519164

As large main memory becomes more and more available at reasonable prices, processing speed of large data sets becomes more important than reducing main memory usage of internal data structures which are small compared to the available main memory capacity. In this paper we describe the use of a finite state machine for fast processing of prefix codes that significantly improves decoding performance in practice, and that is easy to implement. We present an intuitive explanation of this method, an extension to discover symbol boundaries in compressed data, implementation details, and we also provide experimental performance results.

关键词： variable length coding data compression fast decoding Huffman codes prefix codes

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An Exp-Golomb encoder and decoder architecture for JVT/AVS 5

An Exp-Golomb encoder and decoder architecture for JVT/AVS

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5th International Conference on ASIC

作者： Wu, D Gao, W Hu, MZ Ji, ZZ Harbin Inst Technol Dept Comp Sci & Engn Harbin Peoples R China

ISBN: (纸本)078037889X

In recent years, the Exp-Golomb coding, a form of variable length coding (VLC), has gained greater attention due to its important uses in the emerging JVT (also called H.264 in ITU, and AVC in MPEG-4) and AVS (self-developed Chinese audio video standard). In this paper, the Exp-Golomb encoder and decoder architectures for JVT and AVS are proposed for the first time. To solve the key problem associated with determining the code length in the Exp-Golomb encoding and decoding, we use an approach called 'the first 1 detect method' that can greatly simplify the architectures The areas of the encoder and decoder proposed ire 2048 and 3210 gates respectively. which pretty small. The critical path delays in both architectures are less than 6ns. Therefore. these designs can meet the requirement of high speed for the encoding and decoding in real time.

关键词： logic circuits logic design variable length codes Exp-Golomb encoder decoder architecture JVT-AVS Exp-Golomb coding variable length coding H.264 ITU MPEG-4 AVS Chinese audio video standard code length first 1 detect method critical path delays

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H.264 codec system-on-chip design and verification 5

H.264 codec system-on-chip design and verification

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5th International Conference on ASIC

作者： Peng, Q Jing, J Aurora VA Technol LLC Boston MA 02132 USA

ISBN: (纸本)078037889X

We designed a SoC/ASIC to implement the low power, high performance H.264 encoder and decoder with a 32-bit RISC CPU on a single chip. We used the system modeling technique to develop the H.264 codec and high-speed RISC microprocessor cores. and adopted the transaction-level based verification technique to do the automatic self-checking, regression testing for the design. The SoC runs the H.264 codec in hardware. It incorporated standard peripheral interfaces, such as UART. USB. 100/10 Mbps Ethernet. IEEE 1394, ATAPI, and SVGA. It supports embedded real-time OS for PDA and wireless applications. It is implemented for complicated Linux operating systems used for personal video recorder, DVD recorder, game and set top boxes, digital camcorders, video conferencing kit, and network computers.

关键词： H.264 advanced video coding AVC entropy coding transform and quantization intra prediction inter prediction reconstruction filter variable length coding CAVLC CABAC switching P and I slices

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An efficient motion field representation using JBIG approach for video compression 3

An efficient motion field representation using JBIG approach...

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Conference on Electronic Imaging and Multimedia Technology III

作者： Tseng, SY Shoochow Univ Dept Comp & Informat Sci Taipei Taiwan

ISBN: (纸本)0819447145

In this study, a simple and efficient scheme to improve the compression ratio of the block-based motion fields in the video compressing is proposed. In the proposed scheme, each motion field is represented by a small set of coded motion vectors and a binary bitmap. Some of the motion vectors in a motion field, named as significant motion vectors (SMVs), have the property of being significantly different from the motion vectors of their spatial or temporal adjacent blocks. Instead of coding all the motion vectors in a motion field, only the SMVs need to be coded in the proposed scheme. For each block in a frame, one bit, corresponding to its position on the binary bitmap, is used to record if the motion vector is significant or not. And then, the joint bilevel image experts group (JBIG) image coding standard is applied on the bitmap to improve the bit-rate. The experimental results reveal that more than half of the motion vectors are non-significant and can be omitted on coding procedure. Although there exists an overhead of JBIG coded binary bitmap, the coding improvement ratio of the proposed scheme is over 40% on average when comparing with the conventional variable length coding (VLC) scheme.

关键词： JBIG motion field motion vector variable length coding video compression

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Application of biorthogonal wavelet transform to the compression of ultraviolet-visible spectra

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COMPUTERS & CHEMISTRY 1999年第1期23卷 85-96页

作者： Ho, HL Cham, WK Chau, FT Wu, JY Hong Kong Polytech Univ Union Lab Asymmetr Synth Hong Kong Peoples R China Hong Kong Polytech Univ Dept Appl Biol & Chem Technol Hong Kong Peoples R China Chinese Univ Hong Kong Dept Elect Engn Hong Kong 100083 Peoples R China

A wavelet transform (WT) based method was proposed to compress ultraviolet-visible (UV-vis) spectra from chemical and biochemical studies. These spectra were first transformed into different sub-bands which contain information on different scales and frequency bands. The biorthogonal filter banks (BFB) coupled with the circular (CE) or symmetric extension (SE) method were employed in the WT treatment. Differential pulse code modulation (DPCM) was applied to further reduce the storage space required for the scale coefficients which were generated from the WT treatment. Then, optimal bit allocation (OBA) procedure for data quantization coupled with variable length coding (VLC) was applied to these coefficients to minimize the root-mean-square difference (RMSD) between the original and reconstructed spectra. Both synthetic and experimental spectra were used in the study. Our results show that the performance of the proposed compression methods are better than those suggested in the previous studies. (C) 1999 Elsevier Science Ltd. All rights reserved.

关键词： wavelet transform biorthogonal filter bank sub-band coding optimal bit allocation variable length coding data compression

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