Patent Document ID: 9338460
Application ID: 14539976

Base 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, 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.

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Claim 10:
10. The apparatus of claim 1 , wherein if only one of the left quantization parameter and the above quantization parameter is available, an average of the available quantization parameter and the previous quantization parameter is set as the quantization parameter predictor.