HEVC intra-frame prediction coding method and system

The invention discloses an HEVC intra-frame prediction coding method and system, and belongs to the technical field of the video coding technique. The method comprises the steps that each image frame is segmented into largest coding units (LCUs) which are not overlapped; the area smoothness of a current LCU is calculated; the similarity between the current LCU and an adjacent LCU is calculated; self-adaption depth prediction is performed according to the similarity between the current LCU and the adjacent LCU; the depth of the current LCU is determined according to the smoothness of the current LCU and the similarity between the current LCU and the adjacent LCU, and coding is performed according to the depth of the current LCU. By the adoption of the HEVC intra-frame prediction coding method and system, CU partition is stopped in advance by early stopping prediction or a certain layer of partition is omitted; meanwhile, as the number of intra-frame prediction modes in an RDO process is reduced in a PU layer, a CU layer and the PU layer are optimized and integrated together, implementation complexity can be reduced, and HEVC intra-frame prediction time is greatly shortened.