JPEG2000全通道并行EBCOT-Tier1編碼器結(jié)構(gòu)設(shè)計(jì)
Full Pass-Parallel Architecture for EBCOT-Tier1 Encoder in JPEG2000
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摘要: 新一代靜止圖像壓縮標(biāo)準(zhǔn)JPEG2000采用了EBCOT算法。該算法Tier1部分在上下文生成過(guò)程中需要對(duì)位平面進(jìn)行多次通道掃描，效率很低，難以滿足高質(zhì)量圖像實(shí)時(shí)壓縮的要求。目前已有多種改進(jìn)方案被相繼提出，主要基于PS/GOCS和多窗口通道并行掃描。該文設(shè)計(jì)出一種適用于硬件實(shí)現(xiàn)的單窗口全通道并行編碼結(jié)構(gòu)，目前已通過(guò)FPGA驗(yàn)證。實(shí)驗(yàn)表明，該結(jié)構(gòu)下Tier1編碼速度明顯優(yōu)于現(xiàn)有幾種優(yōu)化方案。同時(shí)，本設(shè)計(jì)所采用的編碼邏輯在解碼過(guò)程中亦可使用，便于進(jìn)行編解碼復(fù)用設(shè)計(jì)。Abstract: EBCOT algorithm is an essential part of the new image compression standard, JPEG2000. The Tier1 part of EBCOT requires each bit-plane be scanned for three times in order to generate entropy contexts. Therefore the scanning efficiency is unacceptable，which fails to fulfill real-time compression of high quality images. So far some improvements have already been made, mainly based on PS/GOCS, and multi-window/pass-parallel coding technique. In this paper, a hardware-oriented, full pass-parallel coding architecture is presented, based on only one scanning window. This architecture is verified on FPGA. Experimental results show that its coding speed is superior to the other two main improvements. Furthermore, the coding logic adopted can be reused on the decoding stage, which facilitates sharing code/decode architecture.
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Boliek M, Christopoulos C, Majani E. ISO/IEC JTCl/SC29/WGlN1890. JPEG2000 Part I final draft international standard [Z].ISO/IEC JTCl/SC29/WGl N1890 Sept, 2000.[2]Taubman. High performance scalable image compression withEBCOT [J].IEEE Trans. on Image Processing.2000, 9(7):1158-1170[3]Taubman, Ordentlich, Weinberger, Serourssi. Embedded blockcoding in JPEG2000. IEEE International Conference on ImageProcessing (ICIP 2000)[C], Vancouver, Canada, 2000, Vo1.2:33 36.[4]Chiang Jen-Shiun, Lin Yu-sen, Hsieh Chang-yo. Efficientpass-parallel architecture for EBCOT in JPEG2000 [A]. IEEEInternational Symposium on Circuits and Systems(ISCAS2002)[C], Scottsdale, Arizona, 2002, Vol.l: 773 776.[5]Chen Kuan-fu, Lian Chung-Jr, et al.. Analysis and architecturedesign of EBCOT for JPEG2000 [A]. The 2001 IEEEInternational Symposium on Circuits and Systems (ISCAS 2001)[C]，Sydney, Australia, 2001, Vo1.2: 765-768.[6]Andra Kishore, Chakrabarti Chaitali, Acharya Tinku. A highperformance JPEG2000 architecture. The 2002 IEEEInternational Symposium on Circuits and Systems (ISCAS 2002)[C], Scottsdale, Arizona, 2002: 765-768. -
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