基于CCD图像的LED显示屏亮度均匀性评估方法  

Assessment method for luminance uniformity of LED display based on CCD image

作　　者：王宇庆[1] 刘维亚[1] 丁铁夫[1] 郑喜凤[1] 王瑞光[1] 徐秀知[1] 陈宇[1] 汪洋[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《液晶与显示》2014年第1期137-145,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：国家科技创新基金资助项目(No.020262112);吉林省与中国科学院科技合作资金项目(No.2005SYHZ0010);中国科学院东北振兴科技行动计划重点项目(No.DBZX-2-017)

摘　　要：将CCD摄像机用于LED显示屏亮度特征数据的采集,深入分析了LED显示屏CCD感光图像的特点,在此基础上,完成了感光单元的识别以及亮度特征数据的提取,提出了一种通过计算亮度特征图像各部分之间的相似程度评估显示屏亮度均匀性的方法。针对亮度特征图像,采用在水平和垂直方向上各等分为2块以及直接将其等分为4块2种分块方法,分别计算各图像分块之间奇异值向量的夹角以度量其相似程度,最后将各分块相似度的平均值作为该显示屏样块亮度均匀性的度量。实验结果表明,2种分块方法对同一组显示屏样块的亮度均匀性评估结果是一致的,均与人的主观感觉相符。CCD camera is used in the luminance data acquisition of LED display, and the property of CCD photosensitive image is analyzed. On the basis of that, a luminance uniformity assessment method is presented after finishing photosensitive unit recognition and luminance data extraction. It is based on the structure comparability of the different parts of the luminance data image. The luminance data image is divided into two blocks horizontally and vertically. It＇s also divided into four blocks equally.The angle between singular vectors of each two blocks is used to evaluate their difference. The blocks of luminance data image of LED display with good luminance uniformity are more similar than the blocks of luminance data image of LED display with poor luminance uniformity. The luminance uniformity of the display is accordingly evaluated by the difference measurement of the blocks. Experimental results show that the assessment results of the two dividing methods are all coincident with perceptual property of human eye.

关 键 词：光学测量 CCD图像 亮度均匀性 奇异值分解 

分 类 号：TP752[自动化与计算机技术—检测技术与自动化装置]