改变LCD显示图像属性的γ校正方法  

γ correction methods for changing image attributes on LCD

作　　者：刘璐[1] 尹涵春[1] 夏军[1] 葛书[1] 秦少玲[1] 

机构地区：[1]东南大学电子科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2008年第6期955-959,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2003CB314706);高等学校学科创新引智计划(111计划)资助项目(B07027).

摘　　要：测量了LCD屏上均匀分布的25点的灰度与亮度关系曲线,计算了25点红、绿、蓝三色的γ值.在改变图像属性量值的图像处理中用插值法对全屏像素点进行了γ校正,并用亮度插值及线性压缩对全屏进行了对称性补偿.另外,提出了用查表法进行γ校正的方法,测量和计算结果表明,该方法可提高图像属性改变量的准确性.比较了2种γ校正方法,分析其对图像处理的影响.采用γ校正的图像处理使图像属性能在小范围内作多种等级的改变,满足视觉感知的图像属性阈值研究的要求.Based on the measurement of gray-level and luminance curve at 25 points symmetrically distributed on LCD（liquid crystal display）,γ values of 25 points for red,green and blue are calculated and interpolated to all pixels for γ correction in image processing.Unsymmetry is also compensated by luminance interpolation and linear scaling.In addition,a look-up-table method is proposed for γ correction.The results of measurement and calculation indicate that it can improve the accuracy of changing image attribute.The two γ correction methods are compared and their effects on image processing are analyzed.As a result,image attributes can be changed to different levels with small distortion by the γ correction in image processing.It can be used to investigate the visual perceived threshold of image attribute.

关 键 词：视觉感知 图像属性 LCD Γ校正 亮度均匀性 

分 类 号：TN873.93[电子电信—信息与通信工程]