印刷电路板外观检测中光电图像的色差矫正方法  

Method for Chrominance Correction of Photoelectric Image of Appearance Detection in Printed Circuit Board

作　　者：张静[1] 叶玉堂[1] 谢煜[1] 常永鑫[1,2] 刘霖[1] 刘娟秀[1] 罗颖[1] 叶溯[1] 

机构地区：[1]电子科技大学,四川成都610054 [2]中国科学院光电技术研究所,四川成都610209

出　　处：《计量学报》2015年第3期238-241,共4页Acta Metrologica Sinica

基　　金：国家自然科学基金(61205004);粤港招标关键领域重点突破项目(W0511159);兵器集团项目(W0511142)

摘　　要：针对印刷电路板产品在检测中受制作工艺和照明设备的影响，分析其产生色彩偏差的基本原理，提出板内和板间色差矫正的新算法，分析了照明模型得到亮度变换函数对板间色差进行矫正，重点采用LAB色彩模型中的亮度通道，利用亮度积累直方图计算映射函数去均衡板内的色差。实验表明，该算法矫正了印刷电路板在检测预处理阶段出现的板内和板间的色彩偏差，提高自动光学检测的检测精度和效率，在光电图像的测量领域具有广泛的应用前景。In order to reduce the impact of craftsmanship and lighting equipment which were produced in the processing of detection, the principle of color deviation was analysed and a new algorithm of the board and between the board chromatic correction was proposed. The method firstly analyses illumination model and obtain correction function to correct the color difference between the boards, then adopts luminance channel of LAB color model and takes advantage of the accumulated illumination histogram to calculate mapping function which is to correct chrominance aberration. The experiments have shown that the algorithm correct color deviation in the board and between boards in the preprocessing of PCB detection, which improve detection accuracy and efficiency of automatic optical inspection. It will have a wide applications in the field of optical image measurement.

关 键 词：计量学 印刷电路板 缺陷检测 色彩偏差 色差矫正 

分 类 号：TP96[自动化与计算机技术]