Intra-frame coding: Difference between revisions

Revision as of 06:40, 23 September 2016

Revision as of 06:47, 23 September 2016

Line 3:

'''Intra-frame coding''' is used in video coding (compression). It is part of an intra-frame codec like [[ProRes 422|ProRes]]: a [[group of pictures]] codec without [[inter frame]]s.

Intra-frame prediction exploits spatial redundancy, i.e. correlation among pixels within one frame, by calculating prediction values through extrapolation from already coded pixels for effective [[delta coding]]. It is one of the two classes of predictive coding methods in [[video coding]]. Its counterpart is inter-frame prediction which exploits temporal redundancy. Temporally independently coded so-called intra frames use only intra coding. The temporally coded [[predicted frame]]s (e.g. MPEG's P- and B-frames) may use intra- as well as inter-frame prediction.

[[File:Pixel-prediction.svg|thumb|128px|Usually known adjacent samples (or blocks) are above, above left, above right, and left (A–D).]]