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快速高效无损图像压缩系统的低功耗硬件实现

DOI: 10.3969/j.issn.1006??7043.201212064

Keywords: 快速高效无损图像压缩系统, Golomb??Rice编码, 吞吐量, 超大规模集成电路, 贝尔图像, 低功耗

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Abstract:

针对快速高效无损图像压缩系统(FELICS)中,Golomb??Rice编码??k??参数选取增加系统复杂度和限制系统吞吐量的问题,依据基于上下文的图像压缩理论,采用JPEG??LS中的序列参数估计方法,研究了限长Golomb??Rice编码。给出了面向超大规模集成电路(VLSI)实现的低功耗快速高效无损图像压缩系统。VLSI??oriented FELICS简化了??k??参数的选取,提高了系统的吞吐率;针对贝尔图像格式的算法扩展提高了FELICS算法对Bayer图像的压缩效果。在SMIC 0.13 μm工艺条件下,基于该方法完成了面向低功耗胃窥镜的VLSI设计。当系统工作在25 MHz,图像数据时钟为24 MHz时,编码每帧图像的功耗仅为11.15 μW,VGA图像的吞吐率可以达到60 f/s。

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