Positioning and sorting method and application of LED display point

Zi-cheng XU; Gui-xin GUO; Xi-feng ZHENG; Yang ZHOU

doi:10.37188/CJLCD.2020-0278

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Positioning and sorting method and application of LED display point

Display Technology and Applications | 更新时间：2021-04-02

- Positioning and sorting method and application of LED display point
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 4, Pages: 575-583(2021)
- 作者机构：
  
  1.长春希达电子技术有限公司, 吉林长春 130103
  2.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  3.季华实验室, 广东佛山 528200
- 作者简介：
- 基金信息：
- DOI：10.37188/CJLCD.2020-0278
  CLC： TN27
- Received：16 October 2020，
  
  Revised：23 November 2020，
  
  Published：2021-04
- 稿件说明：
移动端阅览
Zi-cheng XU, Gui-xin GUO, Xi-feng ZHENG, et al. Positioning and sorting method and application of LED display point[J]. Chinese journal of liquid crystals and displays, 2021, 36(4): 575-583.
DOI：

Zi-cheng XU, Gui-xin GUO, Xi-feng ZHENG, et al. Positioning and sorting method and application of LED display point[J]. Chinese journal of liquid crystals and displays, 2021, 36(4): 575-583. DOI： 10.37188/CJLCD.2020-0278.

摘要

为实现对LED显示屏的亮色度校正，研究了一种可自动对LED显示屏死灯位置进行补点，并适用于图像采集过程中存在图像倾斜情况的灯点定位排序算法。首先对图像进行二值化处理，计算出所有灯点的中心坐标；然后通过极值法和二向排序法完成了图像中4角灯点的预定位；接着利用线性归类排序法对边界点进行定位排序，通过差值筛选法定位死灯并自动补点，利用边界点坐标与死灯位置理论坐标对所有直线进行归类排序，完成显示屏所有灯点的定位排序。最后介绍了LED显示屏亮度均匀性计算方法，通过亮度校正实验验证灯点定位排序结果的准确性。实验结果表明，校正前显示屏亮度均匀性为73.7%，校正后显示屏的亮度均匀性提高至98.7%。显示屏亮度均匀性已经达到人眼可接受的范围内，校正效果较好，灯点定位排序精度较高。

Abstract

In order to realize the brightness and chromaticity correction of the LED display screen

a lamp point positioning and sorting algorithm that can automatically compensate the dead lamp position of the LED display screen and is suitable for the image tilt during the image acquisition process is studied. Firstly

the image is binarized to calculate the center coordinates of all the light points; then the four-corner light points in the image are pre-positioned by the extreme value method and the two-way sorting method. Then

the boundary points are processed by the linear sorting method positioning and sorting

the dead lights are located by the difference filtering method and automatically added points

all straight lines are sorted using the boundary point coordinates and the theoretical coordinates of the dead lights position to complete the positioning and sorting of all the lights on the display screen. Finally

the calculation method of the brightness uniformity of the LED display is introduced

and the accuracy of the positioning and sorting results of the lamp points is verified through the brightness correction experiment. Experimental results show that the brightness uniformity of the display screen before correction is 73.7%

and the brightness uniformity of the display screen after correction is increased to 98.7%. The brightness uniformity of the display screen has reached the range acceptable to the human eye

the correction effect is better

and the lamp point positioning and sorting accuracy is higher.

关键词

Keywords

references

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