| CPC H04N 19/44 (2014.11) [H04N 19/105 (2014.11); H04N 19/119 (2014.11); H04N 19/124 (2014.11); H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/60 (2014.11)] | 6 Claims |
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1. A method of decoding a video signal, performed by a decoding apparatus, the method comprising:
deriving a residual coefficient of a residual block;
calculating a quantization parameter for the residual block;
performing inverse-quantization on the residual coefficient using the calculated quantization parameter; and
reconstructing a residual sample of the residual block by performing inverse-transform on the inverse quantized residual coefficient,
wherein an encoded residual coefficient for a partial region in the residual block is not transmitted from an encoding apparatus,
wherein a residual sample of the partial region in the residual block is set equal to a default value pre-defined at the decoding apparatus,
wherein the partial region is representative of a region excluding at least one of N columns from a left side of the residual block or M rows from a top side of the residual block, and
wherein the quantization parameter is derived based on a quantization parameter prediction value of the residual block, the quantization parameter prediction value being derived based on a quantization parameter of a neighboring block adjacent to the residual block.
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