Method and apparatus for motion compensation prediction
AssigneeNtt Docomo, Inc.
InventorFrank Jan BOSSEN
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Abstract
The invention relates to a motion compensation performed under an inter-frame prediction. A fractional sample interpolation is applied on retrieved samples to generate fractional samples. The fractional sample interpolation comprises a plurality of filtering operations, and all of filtered results from the filtering operations are truncated down to a predetermined bit depth independent of the bit depth of the samples stored in the reference picture memory.
Claims7
A video decoding method for motion compensation performed under an inter-frame prediction, the method comprising computer executable steps executed by a processor of a video decoder to implement:
- retrieving samples from a reference picture memory;
- applying a first fractional sample interpolation on the samples retrieved from the reference picture memory, in a first direction to generate a first set of fractional samples;
- and
- applying a second fractional sample interpolation on the first set of fractional samples in a second direction to generate a second set of fractional samples,
- wherein the samples are represented with a first bit depth and
- the first set of fractional samples is represented with a second bit depth that is constant regardless of the first bit depth of the samples,
- wherein quarter-pel samples are generated by applying an 8-tap FIR filter having at least [−1, 4, −11, 40, 40, −11, 4, −1] as the first fractional sample interpolation and the second fractional sample interpolation.
A video decoding device for motion compensation performed under an inter-frame prediction, the device comprising:
- a retrieving section retrieving samples from a reference picture memory;
- a first fractional sample interpolation applying section applying a first fractional sample interpolation on the samples retrieved from the reference picture memory in a first direction, to generate a first set of fractional samples;
- and
- a second fractional sample interpolation applying section applying a second fractional sample interpolation on the first set of fractional samples, in a second direction to generate a second set of fractional samples,
- wherein the samples are represented with a first bit depth and the first set of fractional samples is represented with a second bit depth that is constant regardless of the first bit depth of the samples,
- wherein quarter-pel samples are generated by applying an 8-tap FIR filter having at least [−1, 4, −11, 40, 40, −11, 4, −1] as the first fractional sample interpolation and the second fractional sample interpolation.
Dependencies are inferred from the claim text.