Patent Document ID: 9338459
Application ID: 14539969

Base Claim:
1. An image decoding method comprising: generating a merge candidate list using available spatial and temporal merge candidates; obtaining motion information using a merge index and the merge candidate list; generating a prediction block using the motion information; inverse-quantizing a quantized block using a quantization parameter to generate a transform block; inverse-transforming the transform block to generate a residual block; and generating 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 method 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.