An Area and Power Efficient Near-Lossless Image Compressor for Medical Application  

作　　者：CHEN Xinkai ZHANG Xiaoyu LI Xiaowen JIANG Hanjun ZHANG Chun WANG Zhihua 

机构地区：[1]Department of Electronic Engineering, Tsinghua University, Beijing 100084, China [2]Institute of Microelectronics, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Journal of Electronics》2009年第3期439-443,共5页电子学报（英文版）

摘　　要：An innovative design is presented which implements an area and power efficient near-lossless image compressor in an ASIC for power-constrained image sensor nodes in medical field such as the wireless endoscope capsule. The compressor is composed of a JPEG-LS encoder with a novel hardware-oriented image filter which improves the average compression by 17.3%. Architecture design techniques such as parallel pipelines and in-stage resource sharing are extremely employed to save the die area. Low power design techniques such as hierarchy memory access, clock gating and voltage scaling are used to reduce power consumption. The compressor occupies a die area of 0.85mm2 in 0.18μm 1P6M CMOS technology. The im- plemented JPEG-LS encoder costs the lowest gate counts and memory requirement in the reported literature. For VGA images at 15 frames per second, the real-time compression can be achieved at 20MHz clock frequency with power dissipation of 800uW at 1.1V supply voltage.

关 键 词：JPEG-LS Image filter Image compres- sion Low power. 

分 类 号：TN919.81[电子电信—通信与信息系统] TN497[电子电信—信息与通信工程]