Method and apparatus for encoding and decoding image

Abstract

Provided are a method and apparatus for encoding and decoding an image, wherein, the encoding of the image follows the step of dividing a prediction block of a current block into a plurality of regions, thereby compensating for average values of pixel values in the prediction block by each of the plurality of the regions, and a method and apparatus for decoding the image. The method of encoding an image includes determining a first prediction block of a current block to be encoded, dividing the determined first prediction block into a plurality of regions, dividing the current block into a plurality of regions by the same number as in the divided first prediction block and calculating a difference value between an average value of pixels of each region of the first prediction block and anaverage value of pixels of each region of the corresponding current block, compensating each region of the divided first prediction block by using the difference value and generating a second prediction block, and encoding a difference value between the second prediction block and the current block.

Description

technical field [0001] The apparatus and method consistent with the present invention relate to a method and apparatus for encoding and decoding an image, more specifically, by dividing the prediction block of the current block into a plurality of regions, so that according to the Compensating the average value of the pixel values ​​in the prediction block for each region of , in order to encode the image, and involves decoding the image. Background technique [0002] In image compression methods such as Moving Picture Experts Group (MPEG)-1, MPEG-2, MPEG-4, and H.264 / MPEG-4 Advanced Video Coding (AVC), an image is divided into macroblocks to encode the image . Each macroblock is coded with all available coding modes available for inter prediction and intra prediction. Then, according to the bit rate required for encoding the macroblock and according to the degree of distortion between the decoded macroblock and the original macroblock, one of the encoding modes is selecte...

AI Technical Summary

Problems solved by technology

However, due to internal and external factors, luminance changes occur between temporally consecutive frames, so that the luminance of the predicted block obtained from the reference frame and the luminance of the current block to be encoded may differ from each other

Coding efficiency is reduced since the luminance variation between the reference frame and the current frame plays a negative role in the relationship between the current block and the reference block used for predictive coding of the current block

Images