Smart Image Sensor with Integrated Low Complexity Image Processing for Wireless Endoscope Capsules  

作　　者：李晓雯 张沕琳 王志华 Amine Bermak 

机构地区：[1]Department of Electronic Engineering,Tsinghua University [2]Department of Electronic and Computer Engineering,Hong Kong University of Science and Technology [3]Institute of Microelectronics,Tsinghua University

出　　处：《Tsinghua Science and Technology》2009年第5期586-592,共7页清华大学学报（自然科学版（英文版）

摘　　要：A smart image sensor was developed which integrates a digital pixel image sensor array with an image processor, designed for wireless endoscope capsules. The camera-on-a-chip architecture and its on-chip functionality facilitate the design of the packaging and power consumption of the integrated capsule. The power reduction techniques were carried out at both the architectural and circuit level. Gray coding and power gating in the sensor array to eliminate almost 50% of the switch activity on the data bus and more than 99% of the power dissipation in each pixel at a transmitting rate of 2 frames per second. Filtering and compression in the processor reduces the data transmission by more than 2/3. A parallel fully pipelined architecture with a dedicated clock management scheme was implemented in the JPEG-LS engine to reduce the power consumption by 15.7%. The smart sensor has been implemented in 0.18 μm CMOS technology.A smart image sensor was developed which integrates a digital pixel image sensor array with an image processor, designed for wireless endoscope capsules. The camera-on-a-chip architecture and its on-chip functionality facilitate the design of the packaging and power consumption of the integrated capsule. The power reduction techniques were carried out at both the architectural and circuit level. Gray coding and power gating in the sensor array to eliminate almost 50% of the switch activity on the data bus and more than 99% of the power dissipation in each pixel at a transmitting rate of 2 frames per second. Filtering and compression in the processor reduces the data transmission by more than 2/3. A parallel fully pipelined architecture with a dedicated clock management scheme was implemented in the JPEG-LS engine to reduce the power consumption by 15.7%. The smart sensor has been implemented in 0.18 μm CMOS technology.

关 键 词：wireless endoscope capsule digital pixel sensor JPEG-LS low power 

分 类 号：TP212.6[自动化与计算机技术—检测技术与自动化装置] TH772[自动化与计算机技术—控制科学与工程]