The main information of image that all consists in the edge is a sharper place of the gray scale change in the image, and shows the discontinuity of local characters in the image.
图像的主要信息都存在于图像的边缘中，表现为图像局部特征的不连续性，是图像中灰度变化比较剧烈的地方。
This article mainly discusses the change of the incandescent lamp display screen into LED gray-scale screen, which displays both digital information and analogue pictures.
本文主要论述了如何将老式白炽灯显示屏改造成，既可以显示数字信息，又可以显示模拟图像信息的LED灰度屏的设计方案。
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