Method, medium, and system encoding and/or decoding moving pictures by adaptively applying optimal prediction modes

Abstract

A method, medium, and system encoding and/or decoding a moving picture. The moving picture encoding method may include selecting a prediction mode that is optimal for the macro blocks, which correspond to each other, of the color components of a current image based on the characteristics of a predetermined image, generating a predicted image for the current image according to the selected prediction mode, and encoding a moving picture using the predicted image. An optimal prediction mode can be adaptively applied to the macro blocks, which correspond to each other, of the color components, thereby increasing the moving picture's encoding and decoding efficiencies.

What is claimed is: 
     
         1 . A decoding method comprising:
 obtaining a prediction mode by decoding a bitstream;   obtaining by decoding the bitstream, an intra luma prediction mode of a luma component of a current block when the prediction mode is intra prediction;   obtaining intra prediction mode information by decoding the bitstream;   determining an intra chroma prediction mode of a chroma component which is identical to the intra luma prediction mode of the luma component, when the obtained intra prediction mode information represents that the intra chroma prediction mode is identical to the intra luma prediction mode;   determining the intra chroma prediction mode of the chroma component which is different from the intra luma prediction mode of the luma component when the obtained intra prediction mode information represents that the intra chroma prediction mode is different from the intra luma prediction mode;   obtaining a predicted block using the intra chroma prediction mode of the chroma component;   obtaining residue by decoding the bitstream; and   obtaining a restored image using the obtained residue and the obtained predicted block,   wherein the intra luma prediction mode and the intra chroma prediction mode are used to determine a reference pixel from among adjacent pixels in a previously restored block when obtaining the predicted block, and   wherein the obtained intra prediction mode information is decoded from the bitstream at a block level.   
     
     
         2 . A non-transitory computer readable medium comprising computer readable code to control at least one processing device to implement a decoding method, the method comprising:
 obtaining a prediction mode by decoding a bitstream;   obtaining by decoding the bitstream, an intra luma prediction mode of a luma component of a current block when the prediction mode is intra prediction;   obtaining intra prediction mode information by decoding the bitstream;   determining an intra chroma prediction mode of a chroma component which is identical to the intra luma prediction mode of the luma component, when the obtained intra prediction mode information represents that the intra chroma prediction mode is identical to the intra luma prediction mode;   determining the intra chroma prediction mode of the chroma component which is different from the intra luma prediction mode of the luma component when the obtained intra prediction mode information represents that the intra chroma prediction mode is different from the intra luma prediction mode;   obtaining a predicted block using the intra chroma prediction mode of the chroma component;   obtaining residue by decoding the bitstream; and   obtaining a restored image using the obtained residue and the obtained predicted block,   wherein the intra luma prediction mode and the intra chroma prediction mode are used to determine a reference pixel from among adjacent pixels in a previously restored block when obtaining the predicted block, and   wherein the obtained intra prediction mode information is decoded from the bitstream at a block level.