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

WANG Yu-qing; LIU Wei-ya; DING Tie-fu; ZHENG Xi-feng; WANG Rui-guang; XU Xiu-zhi; CHEN Yu

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

Imaging Technology & Image Processing | 更新时间：2020-08-12

- Assessment method for luminance uniformity of LED display based on CCD image
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 1, Pages: 137-145(2014)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP752
- Received：04 January 2013，
  
  Revised：02 February 2013，
  
  Published：15 February 2014
- 稿件说明：
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王宇庆, 刘维亚, 丁铁夫, 郑喜凤, 王瑞光, 徐秀知, 陈宇, 汪洋. 基于CCD图像的LED显示屏亮度均匀性评估方法[J]. 液晶与显示, 2014,29(1): 137-145

WANG Yu-qing, LIU Wei-ya, DING Tie-fu, ZHENG Xi-feng, WANG Rui-guang, XU Xiu-zhi, CHEN Yu, WANG Yang. Assessment method for luminance uniformity of LED display based on CCD image[J]. , 2014,29(1): 137-145
王宇庆, 刘维亚, 丁铁夫, 郑喜凤, 王瑞光, 徐秀知, 陈宇, 汪洋. 基于CCD图像的LED显示屏亮度均匀性评估方法[J]. 液晶与显示, 2014,29(1): 137-145 DOI：

WANG Yu-qing, LIU Wei-ya, DING Tie-fu, ZHENG Xi-feng, WANG Rui-guang, XU Xiu-zhi, CHEN Yu, WANG Yang. Assessment method for luminance uniformity of LED display based on CCD image[J]. , 2014,29(1): 137-145 DOI：

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。

Abstract

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.

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