延时相关与斜率计算的数据位数匹配  

Data Bits Matching between Delay Correlation and Slope Calculation

作　　者：吕明爱[1] 王春鸿[1] 李梅[1] 

机构地区：[1]中国科学院光电技术研究所,四川成都610209

出　　处：《光电工程》2003年第3期6-9,共4页Opto-Electronic Engineering

基　　金：国家863高技术项目资助

摘　　要：在带像增强器的微光波前传感器中,采用延时相关算法抑制CCD输出图像的随机噪声。但 处理后,使得数据位数与斜率计算所需位数不匹配。为使位数匹配提出几种方案:开平方、近似开平方、移8位与移12位,并就输出图像、计算精度、硬件实现难易等对这几种方案展开论述,找出一种最佳方案:综合使用近似开平方与移8位。In a low light level wavefront sensor with image intensifier, the random noise of CCD output image is inhibited by delay correlation algorithm. But after processing, the data bits do not match the bits needed in slope calculation. In order to match bits several schemes such as extracting the square root, approximately extracting the square root, shifting 8 bits and 12 bits are proposed. A discussion for the problems such as output image, calculation accuracy and hardware implementation problems of the above mentioned schemes are carried out and an optimal scheme-comprehensively using approximately extracting the square root and shifting 8 bits is found out.

关 键 词：自适应光学 延时相关 图像处理 移位 近似开平方 

分 类 号：TN911.73[电子电信—通信与信息系统]