LED大屏幕质量检测中的像素点定位方法研究

摘要

In the LED large screen brightness and color testing system of CCD - based photometer, to accu- rately locate the position of the LEDs and their rows and columns play a key role in the entire testing process. In this paper, we proposed a method by means of digital image processing for locating the LEDs of the screen which is captured irregularly due to inevitable reasons. The LEDs are firstly segregated by an appropriate threshold. Then their positions are located by a morphological method. The corresponding rows and columns are calculated according to the neighborhood. The result approved the validity and accuracy of this method even when there are some kinds of image blurring and distortion.%在LED大屏幕亮度、色度检测系统中,准确地定位LED的位置及其所在的行和列在整个检测过程中起着关键作用。该文采用数字图像处理方法,处理在复杂环境背景中的大屏幕图像像素点的定位。首先选取合适的阈值分离出待检测的像素点,然后采用图像形态学算法确定各像素点的位置。最后根据相邻像素点间的关系确定每个像素点所在的行和列。实验结果表明该方法在图像模糊或图像有一定程度的畸变情况下仍能保证必要的精确性和有效性。