Intra-frame coding: Difference between revisions

Revision as of 19:44, 20 September 2019

Revision as of 13:57, 29 September 2021

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'''Intra-frame coding''' is a compression technique used inwithin a video codingframe, (compression)enabling smaller file sizes and lower bitrates, with little or no loss in quality. ItSince isneighboring partpixels ofwithin an intra-image are often very similar, rather than storing each pixel independently, the frame codecimage is divided into blocks and the typically minor difference between each pixel can be encoded using fewer bits. It is used in codecs 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.