Image enhancement processing algorithm for LED display screens using dithering matrix

Jian-zhe SUN; Xi-feng ZHENG; Zi-cheng XU; Hong-bin CHENG; Yu-feng CHEN

doi:10.37188/CJLCD.2021-0192

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Image enhancement processing algorithm for LED display screens using dithering matrix

Image Processing | 更新时间：2021-09-30

- Image enhancement processing algorithm for LED display screens using dithering matrix
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 10, Pages: 1403-1411(2021)
- 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.中国科学院大学, 北京 100049
  3.长春希达电子技术有限公司, 吉林长春 130103
  4.季华实验室, 广东佛山 528200
- 作者简介：
- 基金信息：
  
  High Tech Industrialization Project of Science and Technology Cooperation between Jilin Province and Chinese Academy of Sciences(2020SYHZ0006)
- DOI：10.37188/CJLCD.2021-0192
  CLC： TN27
- Received：21 July 2021，
  
  Revised：04 August 2021，
  
  Published：2021-10
- 稿件说明：
移动端阅览
Jian-zhe SUN, Xi-feng ZHENG, Zi-cheng XU, et al. Image enhancement processing algorithm for LED display screens using dithering matrix[J]. Chinese journal of liquid crystals and displays, 2021, 36(10): 1403-1411.
DOI：

Jian-zhe SUN, Xi-feng ZHENG, Zi-cheng XU, et al. Image enhancement processing algorithm for LED display screens using dithering matrix[J]. Chinese journal of liquid crystals and displays, 2021, 36(10): 1403-1411. DOI： 10.37188/CJLCD.2021-0192.

摘要

为解决LED显示屏在低灰度条件下出现图像亮度损失、灰阶跳变等问题，提出一种运用抖动矩阵的LED显示屏低灰度图像增强处理算法。首先，根据LED显示原理和传统抖动算法图像增强原理，提出LED显示屏“小数灰度级”的概念，接着根据测试等相关手段获得使各像素点显示效果增强的“小数灰度级”数据，运用抖动矩阵在4帧图像中按照“误差最小原则”实现其相应的“小数灰度级”。然后，采用亚像素抖动技术进一步降低了画面抖动给人眼带来的闪烁感。最后，用Matlab软件对算法进行对比仿真，验证了算法的可行性与有效性。实验结果表明，该算法对LED显示屏低灰度级灰阶过渡不均匀现象有明显的改善效果，将灰度级10以下的灰度显示能力提升为原来的4倍，同时将LED显示屏的最小可控灰度级亮度变为原来的15%~25%，提升了LED显示屏的对比度。

Abstract

In order to solve the problems of image brightness loss and gray-level jump in low grayscale conditions of LED display screens

a low grayscale image enhancement processing algorithm for LED display screens using dither matrix is proposed. According to the principle of LED display and the image enhancement principle of traditional dithering algorithm

the concept of "decimal gray level" of LED display is proposed

and then the "decimal gray level" data that enhances the display effect of each pixel is obtained according to related methods such as testing. The dither matrix realizes its corresponding "decimal gray level" in accordance with the "principle of minimum error" in 4 frames of images. The sub-pixel dithering technology is used to further reduce the flicker caused by the image jitter to the human eyes. The algorithm was compared and simulated with Matlab software to verify the feasibility and effectiveness of the algorithm. The experimental results show that the algorithm has a significant improvement effect on the uneven transition of the low gray level of the LED display screen

and the gray level display ability of the gray level below 10 is increased to 4 times of the original. At the same time

the minimum controllable gray level brightness becomes 15%~25% of the original

which improves the contrast of the LED display.

关键词

Keywords

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