文档介绍：重庆大学
硕士学位论文
全彩LED大屏幕检测方法的研究
姓名:常宇
申请学位级别:硕士
专业:电气工程
指导教师:李志敏
2010-05
重庆大学硕士学位论文中文摘要
摘要
本文针对全彩 LED 大屏幕的检测方法,以定位算法为基础,亮度、色度检测
算法为核心,生成的显示参数校正系数表为最终结果,展开研究工作。通过对人
眼视觉惰性的分析,结合全彩 LED 大屏幕的组成结构及色光加色法原理,探索一
种基于数字图像处理技术的检测新方法,以期达到改善全彩 LED 大屏幕的显示效
果,降低其维护成本,提高全彩 LED 大屏幕产品的显示品质和生产效率。
本文的主要研究内容如下:
1. 在分析全彩 LED 大屏幕显示图像灰度分布特性的基础上,采用最大方差阈
值方法分割采集图像,并结合投影定位算法,实现了各 LED 像素点的定位,确保
准确、有效地获取检测数据;
2. 采用 YUV 颜色模型,分析了各 LED 像素点的相对亮度值,对亮度不一致
的像素点进行筛选与记录;
3. 采用 CIE rg 色度坐标、CIE xy 色度坐标体系及麦克亚当()
颜色宽容度量原理,对各 LED 像素点的色度坐标进行了计算与筛选;
4. 对各 LED 像素点的亮度、色度检测结果进行了归纳合并,并生成各 LED
像素点的校正系数表。
最后,在 VC++ 环境下编程实现了检测算法,并采用 AvaSpec-2048 微型光
谱仪进行了对比测试。其结果表明该检测方法是有效的,且处理速度快,检测精
度高,能大大提高全彩 LED 大屏幕的检测效率和显示质量。
关键词:全彩 LED 大屏幕,亮度和色度检测,图像处理,阈值分割,显示质量
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重庆大学硕士学位论文英文摘要
ABSTRACT
For the detection method of full-color LED large screen, this paper always centers
on the idea, that the location algorithm is the basic, luminance & chroma detection
algorithm is the core, generating the display parameter correction coefficient table is the
final result, to start research work. Through the analysis of human visual inertia,
combined with the construction structure of full-color LED large screen and the
principle of additive color mixture, this paper explores a kind of new detection method,
based on the digital image processing technology, with the research objectives to
achieve the display improvement of full-color LED large screen, reduce the
maintenance costs, increase the display quality and production efficiency of full-color
LED large screen products.
This paper mainly includes the following:
1. Firstly, based on the analysis of gray distribution for display images of full-color
LED large screen, using the method of maximum variance threshold to segment the
capture images, and then projection location algorithm is used to achieve the position of
each LED pixel. The whole process is to ensure the accura