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Introduction to Digital Video, 2nd Edition by John Watkinson

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Chapter 4

Digital video processing

The conversion process expresses the analog input as a numerical code. Within the digital domain, all signal processing must be performed by arithmetic manipulation of the code values. Whilst this was at one time done in dedicated logic circuits, the advancing speed of computers means that increasingly the processes explained here will be performed under software control. However, the principles remain the same.

4.1 A simple digital vision mixer

During production, the samples or pixels representing video images need to be mixed with others. Effects such as dissolves and soft-edged wipes can only be achieved if the level of each input signal can be controlled independently. Level is controlled in the digital ...

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