The invention discloses an H.264 / AVC intra-prediction method based on edge characteristics, which includes: performing data block prejudging before intra-prediction based on principal edge intensity (DES) and the like edge direction characteristics calculated by the edge
histogram description describing the image marginal distribution, selecting the mode subclass corresponding to the characteristics to perform RDO calculation, thereby reducing the
mode selection number of the intra-prediction; at the same time directly determining the Intra_8*8
chrominance prediction mode from the Intra_16*16 brightness prediction mode according to the correlativity of the
chrominance prediction mode and the brightness prediction mode, to further reduce the complexity of the
algorithm. The method has six steps, and is convenient and facilitating. Practice shows that the method can obviously improve the encoding speed, and can ensure that the bit-rate encoding (an increase of 3%) and peak
signal-
noise ratio (reduced about 0.02dB) have little change compared with the full search method. The method has very good practical value and application prospects.