...灰度变化；相关函数 [gap=1400]Key words: pulsed high intensity focused ultrasound; ultrasound monitoring; gray-scale change; correlation function ...
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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。
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。
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