Patent ID: 9432663
Filing Date: 2016-08-30
CPC Classification: H04N

Claim Text:
1. An apparatus for encoding a video, the apparatus comprising: a bitstream decoder configured to extract information on a size of a transform unit and generate a quantized frequency transform block from a bitstream; an inverse quantization unit configured to reconstruct a frequency transform block by inversely quantizing the quantized frequency transform block; an inverse transformer configured to reconstruct a residual block by inversely transforming the frequency transform block, the inverse transformer selecting an inverse transform scheme among a plurality of inverse transform schemes in consideration of the size of the transform unit; a predictor configured to generate a predicted block in a prediction mode selected among an intra prediction mode and an inter prediction mode; and an adder configured to reconstruct a current block by adding a first pixel corresponding to the residual block and a second pixel corresponding to the predicted block, wherein the inverse transformer considers a first transform scheme only when the size of the transform unit corresponds to a transform unit size of 4×4 among a plurality of available transform unit sizes, wherein the transform unit is divided from a coding unit in a quad tree, and the bitstream decoder decodes a split transform flag, as one of the information on the size of the transform unit, for at least one depth of the quad tree, wherein the first transform scheme corresponds to a transform scheme in which each of four output values {X′( wherein the transform scheme in which each of four output values {X′(