Complexity-scalable intra-frame prediction technique
First Claim
1. A method of motion picture encoding comprising the steps of:
- defining a plurality of intra frame prediction modes, said plurality of intra frame prediction modes including a DC mode and a plurality of modes having respective differing prediction directions;
forming a subset having a predetermined number of said plurality of intra frame prediction modes including said DC mode and some but not all of said plurality of modes having respective differing prediction directions;
dividing a picture frame into a plurality of sub-blocks;
selecting one of a low-complexity encoding and a high-complexity encoding;
upon selection of said low-complexity encoding, determining an intra frame prediction mode for each sub-block from among said subset of intra frame prediction modes;
upon selection of said high-complexity encoding, determining an intra frame prediction mode for each sub-block from among said plurality of intra frame prediction modes;
transmitting compressed data including said determined intra frame prediction mode for each sub-block to a decoder.
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Abstract
This invention is a method of encoding intra frames when encoding a motion picture. A set of intra frame prediction modes includes a low-complexity subset. A probability table relates the prediction mode of adjacent sub-blocks to the prediction mode of the current sub-block. For each combination of adjacent sub-blocks, the probability table includes a list of prediction modes in order of expected occurrence. The probability table is adjusted so that each list for prediction modes within the low-complexity subset include initial prediction modes of the low-complexity subset. Individual sub-blocks of intra frames are predictively coded in a low-complexity encoding the using the low-complexity subset or in a high-complexity encoding using any prediction mode. This permits a low-complexity decoder responsive to only the low-complexity subset.
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Citations
13 Claims
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1. A method of motion picture encoding comprising the steps of:
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defining a plurality of intra frame prediction modes, said plurality of intra frame prediction modes including a DC mode and a plurality of modes having respective differing prediction directions; forming a subset having a predetermined number of said plurality of intra frame prediction modes including said DC mode and some but not all of said plurality of modes having respective differing prediction directions; dividing a picture frame into a plurality of sub-blocks; selecting one of a low-complexity encoding and a high-complexity encoding; upon selection of said low-complexity encoding, determining an intra frame prediction mode for each sub-block from among said subset of intra frame prediction modes; upon selection of said high-complexity encoding, determining an intra frame prediction mode for each sub-block from among said plurality of intra frame prediction modes; transmitting compressed data including said determined intra frame prediction mode for each sub-block to a decoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification