Method and apparatus for encoding/decoding video signal using block prediction information
This invention relates to a method and apparatus for encoding video signals using prediction information of an intra mode block of a sub-layer and decoding the encoded video data accordingly. The method encodes a video signal in a scalable MCTF scheme to output a bit stream of an enhanced layer, and simultaneously encodes the video signal using a pre-determined method to output a bit stream of a base layer. When the video signal is encoded in the MCTF schemes, an image block included in an arbitrary frame of the video signal is coded as an intra mode using pixels adjacent to the image block, on the basis of prediction information of the corresponding block coded as the intra mode, the corresponding block being included in a bit stream of the base layer and corresponding to the image block.
1. An apparatus of decoding a video signal, comprising:
a de-muxer receiving a bitstream of an enhanced layer and a bitstream of a base layer;
a first decoder extracting a residual value of an image block from the bitstream of the enhanced layer;
a second decoder extracting intra mode prediction information of a corresponding block from the bitstream of the base layer, the corresponding block being temporally coincident with a frame including the image block; and
the first decoder obtaining a prediction value of the image block using an adjacent pixel of the image block and the intra mode prediction information, and reconstructing the image block of the enhanced layer based on the residual value of the image block and the prediction value of the image block.
2. The apparatus of claim 1 , wherein the corresponding block is located at the same position as the image block, or covering an area of the same position as the image block.
3. The apparatus of claim 1 , wherein the intra mode prediction information includes information relating to a prediction mode and a prediction direction.
4. The apparatus of claim 3 , wherein the prediction mode is selected to one of intra 4×4, intra 8×8 and intra 16×16.
5. The apparatus of claim 1 , wherein the first decoder extracts header information from the bitstream of the enhanced layer, and reconstructs the image block when the header information of the image block indicates that the image block is coded by using the intra mode prediction information of the corresponding block.
6. The apparatus of claim 1 , wherein the second decoder extracts a residual value of the corresponding block from the bitstream of a base layer, and the first decoder reconstructs the image block based on the residual value of the corresponding block.
7. A method for decoding a video signal, comprising:
receiving a bitstream of an enhanced layer and a bitstream of a base layer;
extracting a residual value of an image block from the bitstream of the enhanced layer;
extracting intra mode prediction information of a corresponding block from the bitstream of the base layer, the corresponding block being temporally coincident with the image block;
obtaining a prediction of an image block using an adjacent pixel of the image block and the intra mode prediction information; and
reconstructing the image block of the enhanced layer based on the residual value of the image block and the prediction value of the image block.
8. The method of claim 7 , wherein the corresponding block is located at the same position as the image block, or covering an area of the same position as the image block.
9. The method of claim 7 , wherein the intra mode prediction information includes information relating to a prediction mode and a prediction direction.
10. The method of claim 9 , wherein the prediction mode is selected to one of intra 4×4, intra 8×8 and intra 16×16.
11. The method of claim 7 , further comprising:
extracting header information from the bitstream of the enhanced layer,
wherein the reconstructing is performed when the header information of the image block indicates that the image block is coded by using the intra mode prediction information of the corresponding block.
12. The method of claim 7 , further comprising:
extracting a residual value of the corresponding block from the bitstream of the base layer,
wherein the reconstructing is performed based on the residual value of the corresponding block.