多点分段单步校正法在接触式图像传感器扫描仪上的实现  

Realization of multi-point segmented one-setp correction medthod in contact image sensor scanner

作　　者：罗颖[1] 唐雪松[1] 杨健君[2] 刘霖[1] 刘文聪[1,3] 孙文缎[1,3] 尹志强[1,3] 刘永[1] 

机构地区：[1]电子科技大学现代光电测控及仪器实验室(摩米实验室),成都610054 [2]电子科技大学中山学院电子信息学院,广东中山528400 [3]成都术有科技有限公司,成都610054

出　　处：《强激光与粒子束》2014年第3期44-49,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61205004);粤港关键领域重点突破项目(2012205106;20091683)

摘　　要：提出了一种接触式图像传感器(CIS)扫描仪非均匀校正的新方法,能够快速高效地完成对CIS扫描仪彩色图像的非均匀校正,消除了CIS的颜色差异。采用多点分段单步法进行标定,采用现场可编程门阵列实现校正,并最终得到颜色均匀的彩色图像。对于分辨率高达1200dpi的CIS扫描仪,采集一次样板纸完成全部颜色空间的分段标定,图像传输的同时完成校正,校正过程仅耗时0.125μs。实际应用效果显示校正后R,G,B三个通道的像素误差控制在5个像素以内,相比校正前图像均匀性提升10倍左右,比传统两点法提升3倍左右,且明显改善图像颜色突变、暗淡以及随机条纹等问题。A new non uniformity correction method used in contact image sensor （CIS） scanner is presented, and it could rapidly and efficiently accomplish non uniformity correction of CIS scanner＇s color image and eliminate the color difference of CIS. To obtain uniform color images, the multi point segmented one step method is adopted in calibration process and FPGA is used for correcting. For the resolution of CIS scanner up to 1200 dpi, pattern paper is only captured once to complete the calibration of all color space and correction is accomplished during the acquiring image process, and it takes only 0. 125 microsecond. The prac tical application results show that the output image＇s uniformity is about ten times promotion than that before correction and a bout three times than that with traditional two point method.

关 键 词：接触式图像传感器扫描仪 实时校正 非均匀 现场可编程门阵列 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]