Video coding intra-frame prediction method

The invention discloses a video coding intra-frame prediction method, which comprises the steps of: in the aspect of brightness prediction, according to image characteristics, the degree of correlation between coded pixels and coded adjacent predicted pixels and sub-adjacent coded predicted pixel information, adopting different brightness prediction modes; and in the aspect of chromaticity prediction, adopting a chromaticity intra-frame prediction mode based on sub-blocks to predict different coded sub-blocks by using different predicted pixels according to the characteristic that the degree of correlation between the pixels and the coded adjacent pixels of the current encoded sub-block is decreased with the increase of distance. By adopting the method for intra-frame prediction, the prediction is more accurate and the coding effect is improved. Not only is the intra-frame prediction method provided by the embodiment of the invention a complete intra-frame prediction system, but also each prediction mode can be separately used.