高帧频视频图像预处理电路的设计与实现  

Design and Implementation of Video Preprocessing Circuits for High-Frame Rate Image

作　　者：曾祥萍[1,2] 金炜东[1] 

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031 [2]成都信息工程学院电子基础教学实验中心,四川成都610225

出　　处：《光电技术应用》2009年第2期58-61,共4页Electro-Optic Technology Application

基　　金：成都信息工程学院院选科研项目(CRF200816)

摘　　要：针对高帧频图像传感器所获取的模拟视频图像在模数转换中所遇到的问题,设计了视频图像预处理电路.该电路通过阻抗匹配、视频放大、视频箝位、同步分离、同步切割、低通滤波及直流偏置调整与驱动等主要环节,不仅消除了图像采集中产生的各种噪声信号,而且将模拟视频图像信号调整到模数转换器所要求的动态范围内.实验结果表明,通过所设计的视频预处理电路所得到的图像具有时延小、质量好、清晰稳定、信噪比高的优点.In view of the problem caused by high-frame rate image sensor to analog-to-digital converter of video image, video image preprocessing circuits are designed. Through several important links, such as impedance matching, video buffer amplifier, video DC restoration, synchronous separation, synchronous dip- ping, low-pass filtering, I）（2 adjustment and driver, these circuits eliminate all kinds of noise signals produced during gathering images, and adjust analog video image to the dynamic range required by analog-to-digital con- verter. Experimental results show that the images preprocessed in these circuits have advantages of short time delay, good quality, high SNR, better clarity and stability.

关 键 词：视频预处理 高帧频图像 模数转换 电路设计 

分 类 号：TN941.1[电子电信—信号与信息处理] TN702[电子电信—信息与通信工程]