September 2012
Intermediate to advanced
232 pages
5h 26m
English
Content preview from Digital Video Processing for Engineers
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7
Alpha Blending
Chapter Outline
7.2 Concept and Math Behind Alpha Blending
7.3 Implementing Alpha Blending in Hardware
Alpha blending, or alpha compositing, is a video-processing technique that is used to combine two or more video streams on the same frame. This technique is increasingly used to overlay some graphics on a video, such as the 10-yard line in a football match or to put a different background behind a speaker.
We will learn how this is achieved and what kind of processing is required to overlay images.
7.1 Introduction
We will start with two images. Video consists of frames moving at a certain speed (30 fps or 60 fps) and we generally talk about processing within ...
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