Image coding
MPEG-4: basic coding

In the content of a video sequence, there are several types of information: recurring, predictable and unpredictable. Information that recurs or can be predicted is redundant information. Video bitrate reduction, or video coding, takes advantage of various aspects of this information redundancy.

• This redundancy is spatial in large areas of the image where pixels have approximately the same value (cf. example of a uniform area in figure