Method and apparatus for encoding image, and method and apparatus for decoding image
AssigneeKt Corporation
InventorsBae Keun Lee, Jae Cheol Kwon, Joo Young Kim
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Abstract
The present invention discloses a method and an apparatus for encoding and decoding video. A video decoding method comprises reconstructing a residual value by entropy-decoding received bitstream and dequantizing and inverse-transforming residual value information, generating a final prediction unit by performing inter prediction on a prediction unit which is partitioned from a coding unit into at least two prediction units by asymmetric motion partitioning (AMP), the two partitioned prediction units comprising a first partitioned prediction unit and a second partitioned prediction unit, and reconstructing a picture by adding the final prediction unit to the residual values.
Claims4
A method of decoding a video signal having a prediction block to be decoded with a decoding apparatus, comprising:
- selecting a reference picture of the prediction block using a reference index of the prediction block;
- determining a reference block in the reference picture using a motion vector of the prediction block;
- generating reference samples in the reference block,
- wherein generating the reference samples comprises:
- deriving a first sub-sample based on a horizontal interpolation filter to be applied to an integer sample in the reference picture and a shifting operation using a first shifting value;
- and
- deriving a second sub-sample based on a vertical interpolation filter to be applied to the first sub-sample and a shifting operation using a second shifting value, the second sub-sample being one of two quarter position samples and a half position sample which are vertically aligned below the first sub-sample;
- and
- generating prediction samples using the reference samples,
- wherein coefficients of the vertical interpolation filter defined for each of the two quarter position samples and the half position samples are different from each other, and
- wherein the first shift value is variable determined based on a bit depth of a luma component while the second shift value is a constant
- wherein the prediction block is representative of a partition of a coding block which is coded by using asymmetric partitions.
Dependencies are inferred from the claim text.