Method of processing a video signal
A method of processing a video signal is disclosed. The present invention includes obtaining a DC (discrete cosine) transform coefficient for a current macroblock and partition information of a DC (direct current) component block from a bitstream, obtaining transform size information of each partition of the DC component block based on the partition information of the DC component block, performing an inverse DC transform or a Hadamard transform based on the transform size information of the partition of the DC component block, performing inverse quantization on a result value from the transform and an AC (alternating current) component, and reconstructing a residual block by performing an inverse DC transform on a result value from the inverse quantization, wherein the residual block includes a block indicating a pixel value difference between an original picture and a predicted picture.
1. A method of decoding a video signal to enhance coding efficiency in a transform process, comprising:
obtaining a prediction partition mode of a current block;
deriving, at a decoder, transform partition information of the current block based on the prediction partition mode, wherein an M×N transform partition is derived when the prediction partition mode of the current block indicates that a prediction partition of the current block is a P×Q prediction partition, and wherein an N×N transform partition is derived when the prediction partition mode of the current block indicates that the prediction partition of the current block is a P×P prediction partition;
reconstructing residual data for the current block by performing an inverse transform based on the derived transform partition information;
obtaining a prediction value of the current block based on the prediction partition mode; and
reconstructing a pixel value of the current block based on the reconstructed residual data and the prediction value of the current block,
wherein the residual data is a pixel value difference between the reconstructed pixel value and the obtained prediction value,
wherein M is greater than N, and M and N are each a natural number, and
wherein P is greater than Q, and P and Q are each a natural number.
2. The method of claim 1 , wherein the prediction block indicates a unit of block for performing picture prediction.
3. The method of claim 1 , wherein the prediction value of the current block is obtained by performing inter-picture prediction.
4. The method of claim 1 , further comprising performing the inverse transform using M×N residual data, an intermediate value obtained by performing a dot operation between the M×N residual data and a M×N transform kernel, and a N×N transform kernel.