METHODS AND APPARATUSES FOR VIDEO INTRA-FRAME PREDICTION USING A PRESET PREDICTION MODE SET AND INTRA-FRAME PREDICTION MODES OF ADJACENT VIDEO BLOCKS

摘要

The present invention provides a method for encoding an intra-frame predictionmode,including: obtaining an intra-frame prediction mode of a current intra-frameencoding blockfrom a preset prediction mode set; obtaining reference prediction modes of thecurrentintra-frame encoding block, where the reference prediction modes are intra-frame predictionmodes of available adjacent blocks of the current intra-frame encoding blockor predictionmodes in a preset backup reference mode set; writing a first flag bit into acode streamaccording to the reference prediction modes and the intra-frame predictionmode; and, whenthe intra-frame prediction mode of the encoding block is different from allthe referenceprediction modes, obtaining a prediction mode encoding value according to asizerelationship between the value of the intra-frame prediction mode and valuesof the referenceprediction modes, and encoding the prediction mode encoding value. By usingthe encodingmethod provided by the present invention, judgment logic of an encoding endcan be saved,and thereby the encoding efficiency is improved. The present invention furtherprovides acorresponding decoding method and corresponding encoding and decodingapparatuses.