Calibration of image vignetting acquired by camera on LED display panel

ZHANG Xin; WANG Rui-guang; CHEN Yu; WANG Yang

doi:10.3788/OPE.20101811.2332

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Calibration of image vignetting acquired by camera on LED display panel

Article | 更新时间：2020-08-12

- Calibration of image vignetting acquired by camera on LED display panel
- Optics and Precision Engineering Vol. 18, Issue 11, Pages: 2332-2338(2010)
- 作者机构：
  
  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. 中国科学院研究生院北京,100039
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101811.2332
  CLC： TN873;TP391
- Received：30 March 2010，
  
  Revised：13 April 2010，
  
  Published Online：25 November 2010，
  
  Published：25 November 2010
- 稿件说明：
移动端阅览
张鑫, 王瑞光, 陈宇, 汪洋. LED显示屏相机采集影像渐晕的修正[J]. 光学精密工程, 2010,18(11): 2332-2338

ZHANG Xin, WANG Rui-guang, CHEN Yu, WANG Yang. Calibration of image vignetting acquired by camera on LED display panel[J]. Editorial Office of Optics and Precision Engineering, 2010,18(11): 2332-2338
张鑫, 王瑞光, 陈宇, 汪洋. LED显示屏相机采集影像渐晕的修正[J]. 光学精密工程, 2010,18(11): 2332-2338 DOI： 10.3788/OPE.20101811.2332.

ZHANG Xin, WANG Rui-guang, CHEN Yu, WANG Yang. Calibration of image vignetting acquired by camera on LED display panel[J]. Editorial Office of Optics and Precision Engineering, 2010,18(11): 2332-2338 DOI： 10.3788/OPE.20101811.2332.

摘要

为了克服相机影像渐晕在LED显示屏逐点一致化校正过程中带来的不均匀性缺陷

从相机影像发生渐晕时的灰度分布规律出发

提出了一种基于图像平滑滤波算法的修正方法。介绍了CCD对LED显示屏进行数据采集和成像的原理;在分析其成像稳定性的基础上

描述了空域平滑滤波的原理

并选取模板对CCD采集得到的LED像素亮度空间分布做邻域平均平滑处理

得到了代表相机影像渐晕分布的曲面。最后

介绍了利用该曲面实现影像复原的算法。实验结果表明:经过对相机影像渐晕修正以后

可以使LED显示屏的显示均匀性偏差由12.9%缩小到0.73%

克服了修正前LED显示屏"中心暗、四周亮"的缺陷

达到了理想的校正效果。

Abstract

In order to overcome non-uniformity defects arisen from image vignetting captured by a camera in the dot-to-dot correction of a LED display panel

a correction method based on an image smoothing filter algorithm was proposed from the gray distribution rule of vignetting images. Firstly

the imaging principle of CCD on the optical data acquisition in the LED display panel was discussed. Then

the principle of smoothing filter in the spatial domain was described based on the analysis of the stability of CCD imaging

and the surface of the image vignetting defect distribution was obtained by a neighborhood average process to the spatial distribution of LED pixels. Finally

the algorithm to complete the correction of image vignetting by using the surface was presented. Experimental result indicates that the display uniformity deviation of the LED display panel is narrowed from 12.9% to 0.73% after the calibration for the image vignetting

which overcomes the "Center dark

Surround bright" defects on LED display panels and achieves the desired effect.

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Keywords

references

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