Method and apparatus for encoding and decoding based on intra prediction

Abstract

Methods and apparatuses for encoding and decoding based on intra prediction. The method of encoding an image based on intra prediction comprises dividing a current block into a plurality of sub blocks so that a plurality of unit blocks adjacent to each other are included in one of the sub blocks based on an intra prediction direction of each of the unit blocks included in the current block, and performing intra prediction encoding on each of the sub blocks so that only information about one intra prediction direction is encoded in each of the sub blocks.

What is claimed is: 
     
         1 . A method of encoding an image based on intra prediction, the method comprising:
 determining an intra prediction direction of each unit blocks included in a current block;   generating at least one sub block by binding adjacent blocks among a plurality of unit blocks included in the current block based on the intra prediction direction of each of the unit blocks included in the current block,   performing intra prediction encoding in a unit of the sub blocks,   wherein each of the unit blocks is a block which is a standard unit of the intra prediction.   
     
     
         2 . The method of  claim 1 , wherein the sub block is generated by binding unit blocks which are adjacent and have identical or similar intra prediction direction among the plurality of unit blocks included in the current block. 
     
     
         3 . The method of  claim 1 , wherein the intra prediction encoding is performed in the unit of the sub blocks according to the intra prediction direction and the information on the intra prediction mode for the current block is generated and transmitted in the unit of sub blocks. 
     
     
         4 . The method of  claim 1 , the at least one sub block comprises rectangular sub blocks and the rectangular sub blocks comprise at least one of blocks in 16×8, 8×16, 8×4, and 4×8 sizes. 
     
     
         5 . The method of  claim 1 , the at least one sub block comprises square sub blocks and the square sub blocks comprise at least one of blocks in 8×8, 4×4 sizes. 
     
     
         6 . An apparatus for encoding an image based on intra prediction, the method comprising:
 an area divider which determines an intra prediction direction of each unit blocks included in a current block and generating at least one sub block by binding adjacent blocks among a plurality of unit blocks included in the current block based on the intra prediction direction of each of the unit blocks included in the current block,   an intra prediction performer intra prediction encoding in a unit of the sub blocks,   wherein each of the unit blocks is a block which is a standard unit of the intra prediction.   
     
     
         7 . The apparatus of  claim 6 , wherein the sub block is generated by binding unit blocks which are adjacent and have identical or similar intra prediction direction among the plurality of unit blocks included in the current block. 
     
     
         8 . The apparatus of  claim 6 , wherein the intra prediction encoding is performed in the unit of the sub blocks according to the intra prediction direction and the information on the intra prediction mode for the current block is generated and transmitted in the unit of sub block. 
     
     
         9 . The apparatus of  claim 6 , the at least one sub block comprises rectangular sub blocks and the rectangular sub blocks comprise at least one of blocks in 16×8, 8×16, 8×4, and 4×8 sizes. 
     
     
         10 . The apparatus of  claim 6 , the at least one sub block comprises square sub blocks and the square sub blocks comprise at least one of blocks in 8×8, 4×4 sizes. 
     
     
         11 . A method of decoding an image based on intra prediction, the method comprising:
 receiving a bit stream comprising data about a current block which is intra prediction encoded in a unit of sub blocks comprising at least one adjacent unit block among a plurality of unit blocks included in the current blocks;   extracting information regarding an intra prediction mode applied for the unit blocks included in the sub block of the current block;   intra prediction decoding the unit blocks included in the sub block by using the information regarding the intra prediction mode;   wherein each of the unit blocks is a block which is a standard unit of the intra prediction.   
     
     
         12 . The method of  claim 11 , wherein the information about only one intra prediction direction is included for each unit of sub blocks. 
     
     
         13 . The method of  claim 11 , wherein the sub block is generated by binding unit blocks which are adjacent and have identical or similar intra prediction direction among the plurality of unit blocks included in the current block. 
     
     
         14 . The method of  claim 11 , wherein the information on the intra prediction mode for the current block is generated and transmitted in the unit of sub blocks. 
     
     
         15 . The method of  claim 11 , the at least one sub block comprises rectangular sub blocks and the rectangular sub blocks comprise at least one of blocks in 16×8, 8×16, 8×4, and 4×8 sizes or the at least one sub block comprises square sub blocks and the square sub blocks comprise at least one of blocks in 8×8, 4×4 sizes. 
     
     
         16 . A apparatus of decoding an image based on intra prediction, the method comprising:
 an intra prediction mode determiner which receives a bit stream comprising data about a current block which is intra prediction encoded in a unit of sub blocks comprising at least one adjacent unit block among a plurality of unit blocks included in the current blocks; and extracts information regarding an intra prediction mode applied for the unit blocks included in the sub block of the current block;   an intra prediction performer which intra prediction decodes the unit blocks included in the sub block by using the information regarding the intra prediction mode;   wherein each of the unit blocks is a block which is a standard unit of the intra prediction.   
     
     
         17 . The apparatus of  claim 16 , wherein the information about only one intra prediction direction is included for each unit of sub blocks. 
     
     
         18 . The apparatus of  claim 16 , wherein the sub block is generated by binding unit blocks which are adjacent and have identical or similar intra prediction direction among the plurality of unit blocks included in the current block. 
     
     
         19 . The apparatus of  claim 16 , wherein the information on the intra prediction mode for the current block is generated and transmitted in the unit of sub blocks. 
     
     
         20 . The apparatus of  claim 16 , the at least one sub block comprises rectangular sub blocks and the rectangular sub blocks comprise at least one of blocks in 16×8, 8×16, 8×4, and 4×8 sizes or the at least one sub block comprises square sub blocks and the square sub blocks comprise at least one of blocks in 8×8, 4×4 sizes.