3
Sampling and Aliasing
Chapter Outline
Whenever something is represented digitally, it must be sampled. This means that for a continuous, unbroken object to be digitized, it must be represented by many samples, close together in either time or space. If the samples are close enough, then the object appears as if it was continuous. Sampling in time, from a video perspective, means that snapshots of the scene are taken frequently enough to give an impression of continuously moving video when played back. Use of 25 to 30 images per second is common in video systems, and is generally acceptable to most viewers (this will be double in interlaced video, but that will be covered later).
Spatial sampling is applied to images, ...
Get Digital Video Processing for Engineers now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
