Encoding and decoding device and method using intra prediction

Abstract

An apparatus for decoding a video using an intra prediction includes: an encoded data extractor to extract filtering information, information on an intra prediction mode; an intra predictor to calculate a reference pixel characteristic by using one or more of reference pixels within neighboring blocks of the target block, determine a filtering type to be applied to the reference pixels within the neighboring blocks, based at least on the extracted filtering information and the calculated reference pixel characteristic, and generate a predicted block, by adaptively filtering the reference pixels within the neighboring blocks depending on the determined filtering type and then predicting the target block from the adaptively-filtered reference pixels according to the information on the intra prediction mode; a residual data decoder to reconstruct a residual block; and an adder to add the predicted block to the residual block to reconstruct the target block.

What is claimed is: 
     
         1 . An apparatus for decoding a video using an intra prediction, the apparatus comprising:
 an encoded data extractor configured to extract filtering information, information on an intra prediction mode to be applied to a target block and a transformed and quantized residual block corresponding to the target block;   an intra predictor configured to
 calculate a reference pixel characteristic by using one or more of reference pixels within neighboring blocks of the target block, 
 determine a filtering type to be applied to the reference pixels within the neighboring blocks, based at least on the extracted filtering information and the calculated reference pixel characteristic, and 
 generate a predicted block, by adaptively filtering the reference pixels within the neighboring blocks depending on the determined filtering type and then predicting the target block from the adaptively-filtered reference pixels according to the information on the intra prediction mode; 
   a residual data decoder configured to reconstruct a residual block by inversely quantizing and then inversely transforming the transformed and quantized residual block; and   an adder configured to add the predicted block to the residual block to reconstruct the target block.   
     
     
         2 . The apparatus of  claim 1 , wherein the intra-predictor is configured to
 predict the target block from high-frequency filtered reference pixels when the filtering type is a first type, and   predict the target block from high-frequency unfiltered reference pixels when the filtering type is a second type.   
     
     
         3 . The apparatus of  claim 1 , wherein the reference pixel characteristic is a variance of the reference pixels within the neighboring blocks. 
     
     
         4 . The apparatus of  claim 1 , wherein a size of the target block is determined among a plurality of block sizes, the plurality of block sizes including a size larger than 8×8. 
     
     
         5 . The apparatus of  claim 1 , wherein the intra-predictor is configured to, when at least one of the reference pixels within the neighboring blocks is unavailable, fill the unavailable reference pixel with a value calculated by a predetermined operation. 
     
     
         6 . A method performed by an apparatus for decoding a video using an intra prediction, the method comprising:
 extracting filtering information from encoded data;   calculating a reference pixel characteristic by using one or more of reference pixels within neighboring blocks of the target block;   determining a filtering type to be applied to the reference pixels within the neighboring blocks, based at least on the extracted filtering information and the calculated reference pixel characteristic;   generating a predicted block, by adaptively filtering the reference pixels within the neighboring blocks depending on the determined filtering type and then predicting the target block from the adaptively-filtered reference pixels;   reconstructing a residual block of the target block from the encoded data; and   reconstructing the target block by adding the predicted block to the residual block.   
     
     
         7 . The method of  claim 6 , wherein the generating of the predicted block comprising:
 predicting the target block from high-frequency filtered reference pixels when the filtering type is a first type, and   predicting the target block from high-frequency unfiltered reference pixels when the filtering type is a second type.   
     
     
         8 . The method of  claim 6 , wherein the reference pixel characteristic is a variance of the reference pixels within the neighboring blocks. 
     
     
         9 . The method of  claim 6 , wherein a size of the target block is determined among a plurality of block sizes, the plurality of block sizes including a size larger than 8×8. 
     
     
         10 . The method of  claim 6 , further comprising before calculating the reference pixel characteristic:
 when at least one of the reference pixels within the neighboring blocks is unavailable, filling the unavailable reference pixel with a value calculated by a predetermined operation.