发光二极管显示屏CCD图像的修正  

Revision of LED display images acquired by CCD camera

作　　者：丁柏秀[1,2,3] 郑喜凤[1] 陈宇[1] 苗静[1] 桂劲征[1,2] 

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 [2]中国科学院大学,北京100039 [3]长春工程学院,吉林长春130012

出　　处：《光学精密工程》2013年第5期1318-1325,共8页Optics and Precision Engineering

基　　金：国家科技支撑计划资助项目(No.2009BAE73B01)

摘　　要：提出了一种有效的图像修正方法,用于修正用彩色CCD相机采集的LED显示屏图像。首先,利用均匀标准白板逐像素点法对制造工艺使彩色CCD相机产生的曲面进行渐晕修正;然后,利用LED管芯配光曲线的分布规律修正由于相机采集位置的影响产生的偏差,并给出了修正原理和修正的过程;最后,给出了实验数据及结论。修正后,红、绿、蓝基色的均匀性均方差分别从4.0%减少到1.48%,从3.1%减少到1.36%,和从3.5%减少到1.39%。利用该方法修正过的LED图像既消除了相机本身的曲面产生的渐晕,又消除了由于相机采集角度的影响产生的偏差,是一种非常有效的LED显示屏CCD图像的修正方法,实验结果基本符合修正的要求。An efficient revising method was proposed to revise the display images of a Light Emission Diode（LED） captured by a color CCD camera.Firstly,the uniform standard white board was used to revise the vignetting phenomenon caused by a curved surface of color CCD camera in the manufacturing process.Then,on the basis of the distribution regularity of the lighting distribution curve of the LED,the deviation of LED itself caused by the camera position was revised also.The revising theory and revising process were described.Finally,relative data and conclusion were given.It shows that the uniform mean-square deviations of red,green and blue primaries have been decreased from 4.0% to 1.48%,3.1% to 1.36%,and 3.5% to 1.39%,respectively,after revising.It is shown that this method is an efficient one.It not only eliminates the vignetting phenomenon caused by the curved surface of the camera itself,but also removes the deviation caused by the capturing angle of the CCD camera.The experimental results meet the requirements of image revising basically.

关 键 词：发光二极管显示屏 渐晕修正 彩色CCD相机 配光曲线 

分 类 号：TN312.8[电子电信—物理电子学] TP391[自动化与计算机技术—计算机应用技术]