色度键控可以选择显示图像的那一部分。
VID_TYPE_CHROMAKEY: Chromakey can be used to select which parts of the image to display.
本文介绍一种高性能价格比的通用色度键控器，论述其设计思想和特点。
This paper introduces the universal chroma keyer which has a high performance price ratio. The article also outlines the design ideas and feature of the equipment.
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