Method of constructing merge list
First Claim
1. An image decoding apparatus comprising:
- an inter prediction unit configured to generate a merge candidate list using available spatial and temporal merge candidates, obtain motion information using a merge index and the merge candidate list, and generate a prediction block using the motion information;
an inverse quantization unit configured to inverse-quantize a quantized block using a quantization parameter to generate a transform block;
an inverse transform unit configured to inverse-transform the transform block to generate a residual block; and
an adder configured to generate a reconstructed block using the prediction block and the residual block,wherein if a current prediction unit is a second prediction unit partitioned by asymmetric partitioning, the spatial merge candidate corresponding to a first prediction unit partitioned by the asymmetric partitioning is set as unavailable, andwherein the quantization parameter is generated using a quantization parameter predictor and a differential quantization parameter, and the quantization parameter predictor is generated by averaging two quantization parameters of a left quantization parameter, an above quantization parameter and a previous quantization parameter if two or more quantization parameters are available.
1 Assignment
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Accused Products
Abstract
Provided is a method checks availability of spatial merge candidates and a temporal merge candidate, constructs a merge candidate list using available spatial and temporal merge candidates, and adds one or more candidates if the number of available spatial and temporal merge candidates is smaller than a predetermined number. The spatial merge candidate is motion information of a spatial merge candidate block, the spatial merge candidate block is a left block, an above block, an above-right block, a left-below block or an above-left block of the current block, and if the current block is a second prediction unit partitioned by asymmetric partitioning, the spatial merge candidate corresponding to a first prediction unit partitioned by the asymmetric partitioning is set as unavailable. Therefore, the coding efficiency of motion information is improved by removing unavailable merge candidates and adding new merge candidates from the merge list.
4 Citations
10 Claims
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1. An image decoding apparatus comprising:
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an inter prediction unit configured to generate a merge candidate list using available spatial and temporal merge candidates, obtain motion information using a merge index and the merge candidate list, and generate a prediction block using the motion information; an inverse quantization unit configured to inverse-quantize a quantized block using a quantization parameter to generate a transform block; an inverse transform unit configured to inverse-transform the transform block to generate a residual block; and an adder configured to generate a reconstructed block using the prediction block and the residual block, wherein if a current prediction unit is a second prediction unit partitioned by asymmetric partitioning, the spatial merge candidate corresponding to a first prediction unit partitioned by the asymmetric partitioning is set as unavailable, and wherein the quantization parameter is generated using a quantization parameter predictor and a differential quantization parameter, and the quantization parameter predictor is generated by averaging two quantization parameters of a left quantization parameter, an above quantization parameter and a previous quantization parameter if two or more quantization parameters are available. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification