提出了一种基于O SDC的改进型数字视频混合器(VDM)的设计原理,实现了任意字符和图形在视频上的叠加显示,解决了字符大小和屏幕显示容量的矛盾,提高了汉字数字混合显示的美观性,增加了字符勾边显示功能,在不影响原视频图像显示信息量的前提下,增强了在强光下显示字符的可读性。 This paper presents a design principle of ODM-based digital video mixer (VDM), realizes the superimposed display of arbitrary characters and graphics on the video, solves the contradiction between character size and screen display capacity, and improves the Chinese character digital mixing Display of the aesthetics, an increase of the hook character display function, without affecting the original video image display the amount of information under the premise of enhancing the display of characters in the glare readability.