【作者】 李荣军；

【导师】 栾晓明；

【作者基本信息】 哈尔滨工程大学 ， 信号与信息处理， 2007， 硕士

【摘要】 大屏幕显示在商务会议、教学讲座、广告宣传、工业监控等方面都有广泛的应用。LED拼接显示屏作为实现大屏幕显示的一种方法也得到了广泛的使用。近年来，随着国内外在LED材料和控制技术方面不断踊跃出新的成果，LED显示屏产业已发展成为新兴的高科技产业。但是，在我国对LED显示屏的质量检测在很大程度上仍然依靠人工来完成，使检测速度和检测质量受个人主观程度影响很大。失控点数目、色度均匀性是评价LED显示屏显示质量的两个重要指标。因此，本文的研究内容主要围绕着解决这两个问题进行展开。把机器视觉技术融入到对全彩色LED显示屏的检测过程中，研发一种价格相对低廉的LED显示屏智能化测试系统。文章首先对LED显示屏的发展概况进行了介绍，重点分析了LED显示屏在生产、检测和使用过程中存在的问题。然后对机器视觉系统的开发环境LabWindows/CVI进行简单介绍，并针对实际问题提出真彩色显示模块测试系统的硬件系统设计流程。再从色度学角度对显示屏颜色均匀性进行了分析，并提出从三基色色品坐标和白平衡两个方面对LED显示屏的颜色均匀性调整的方案。最后，运用图像分割、图像定位与标记、图像配准等技术对显示屏检测软件流程进行设计，给出了具体的设计流程并对实验结果进行分析。实验表明通过该系统可以实现对显示屏指标的快速检测，并可以根据要求，在一定范围内对显示屏的色彩保真度进行调整。更多还原

【Abstract】 Large screen display has been widely applied in various areas, such as commercial conferences, teaching seminars, advertisement, industrial control and so on. LED panel has been bought into wide use as a means of realizing large screen display. In recent years, with the improvement of LED materials and control technology both at home and abroad, LED panel industry becomes a new high-tech industry. However, the quality testing of LED panel relies a lot on manual work in our country, which results in that the detecting speed and quality are influenced by personal opinions to a great degree.The number of points out of hand and color homogeneity are the two important indicators for quality assessment of LED panel. Therefore, this thesis mainly focused on solving the above-mentioned problems. A relatively low-cost intelligent detecting system of LED panel had been designed by bringing machine vision technology into the detecting course of the full color LED panel.First of all, a survey of LED panel development is reviewed, which emphasizes particularly on analysis of the problems existing in the production, application and detecting process of the LED panels. Then the development environment of machine vision system LabWindows/CVI is introduced, and the hardware design of true color panel detecting system directed at practical applications is proposed. And then the color homogeneity of LED panel is discussed in color theory terms, and a solution to adjust the color homogeneity of LED from the aspect of tricolor coordinate and white balance is put forward. In the end, the software of panel detection is designed based on the image segmentation, image positioning&marking and image matching technology. Simulation results prove that this system can verify the out of point accurately and adjust the color homogeneity of LED panel in a certain range.更多还原