Spatial prediction based intra-coding
OwnerMarta Karczewiczinventor
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Abstract
A method and device for coding a digital image using intra-mode block prediction, wherein the prediction mode of a current block is obtained from the prediction mode of the neighboring blocks. Using the property that it is possible to obtain an ordered list of prediction modes for one combination of prediction modes of the neighboring blocks as a function of the prediction modes for another combination, the size of the prediction table to be used in the encoding and decoding stages can be reduced. Furthermore, in the case of JVT coder, some of the prediction modes can be grouped together and the prediction modes can be relabeled in order to reduce the number of prediction modes.
Claims62
1-23. (canceled)
A method of encoding a digital image using spatial prediction, the digital image comprising a plurality of image blocks including a current image block, the method comprising obtaining an ordered list of available spatial prediction modes for spatial prediction of the current image block in dependence upon a combination of a first spatial prediction mode used to predict a first neighboring image block of the current image block and a second spatial prediction mode used to predict a second neighboring image block of the current image block, wherein for a certain predetermined combination of first and second spatial prediction modes for respective first and second neighboring image blocks, the corresponding ordered list of available spatial prediction modes for the current image block is obtained from an ordered list of spatial prediction modes corresponding to a different combination of first and second spatial prediction modes for said respective first and second neighboring image blocks, thereby reducing an amount of information required to represent the ordering of spatial prediction modes.
An image encoder for encoding a digital image using spatial prediction, the digital image comprising a plurality of image blocks including a current image block, the image encoder arranged to obtain an ordered list of available spatial prediction modes for spatial prediction of the current image block in dependence upon a combination of a first spatial prediction mode used to predict a first neighboring image block of the current image block and a second spatial prediction mode used to predict a second neighboring image block of the current image block, wherein for a certain predetermined combination of first and second spatial prediction modes for respective first and second neighboring image blocks, the image encoder is arranged to obtain a corresponding ordered list of available spatial prediction modes for the current image block from an ordered list of spatial prediction modes corresponding to a different combination of first and second spatial prediction modes for said respective first and second neighboring image blocks, thereby reducing an amount of information required to represent the ordering of spatial prediction modes.
A method of decoding a digital image using spatial prediction, the digital image comprising a plurality of image blocks including a current image block, the method comprising obtaining an ordered list of available spatial prediction modes for spatial prediction of the current image block in dependence upon a combination of a first spatial prediction mode used to predict a first neighboring image block of the current image block and a second spatial prediction mode used to predict a second neighboring block of the current image block, wherein for a certain predetermined combination of first and second spatial prediction modes for respective first and second neighboring image blocks, the corresponding ordered list of available spatial prediction modes for the current image block is obtained from an ordered list of spatial prediction modes corresponding to a different combination of first and second spatial prediction modes for said respective first and second neighboring image blocks, thereby reducing an amount of information required to represent the ordering of spatial prediction modes.
An image decoder for decoding a digital image using spatial prediction, the digital image comprising a plurality of image blocks including a current image block, the image decoder arranged to obtain an ordered list of available spatial prediction modes for spatial prediction of the current image block in dependence upon a combination of a first spatial prediction mode used to predict a first neighboring image block of the current image block and a second spatial prediction mode used to predict a second neighboring block of the current image block, wherein for a certain predetermined combination of first and second spatial prediction modes for respective first and second neighboring image blocks, the image decoder is arranged to obtain a corresponding ordered list of available spatial prediction modes for the current image block from an ordered list of spatial prediction modes corresponding to a different combination of first and second spatial prediction modes for said respective first and second neighboring image blocks, thereby reducing an amount of information required to represent the ordering of spatial prediction modes.
Dependencies are inferred from the claim text.