CCD相机全彩LED显示屏亮度检测与校正算法  

Algorithm of brightness detection and correction on full-color LED display based on CCD camera

作　　者：严利民[1] 潘浩[1] 杜斌[1] 夏明治 

机构地区：[1]上海大学微电子研究与开发中心,上海200072

出　　处：《华中科技大学学报（自然科学版）》2016年第8期75-79,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61376028)

摘　　要：针对LED显示屏亮度显示不均这一问题,提出一种基于CCD相机的全彩LED显示屏亮度检测与校正算法.该算法使用CCD相机获取显示屏显示的图像,并通过数学形态学和大津法对图像进行去噪和阈值分割处理,确定LED灯点的中心位置,然后结合最小外接矩形与亮度相加法确定灯点的相对亮度值,最后计算出显示屏中各个灯点的三色校正系数矩阵.实验结果证明:该算法能够快速、有效地提高LED显示屏的亮度均匀性,从而改善显示屏的显示质量与延长显示屏的使用寿命.To solve the problem of uneven display brightness of the whole LED display,an algorithm of brightness detection and correction of full-color LED display based on CCD（charge-coupled device）camera was introduced in this paper.Images of the LED display were acquired by using a CCD camera.The center position of LED light was determined through threshold segmentation and denoising by using mathematical morphology and OTSU.And then the minimum bounding rectangle was combined with brightness phase addition to determine the relative brightness of the light spot.Finally,correction coefficient matrix of each light point were calculated.Experimental results show that this method can improve the LED display brightness uniformity quickly and effectively,thereby improving the quality of the display and increasing the life time of the display.

关 键 词：图像处理 阈值分割 LED显示 亮度均匀性 检测与校正算法 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]