Intra-frame image predictive encoding method and video encoder

Abstract

The invention discloses an intra-frame image predictive encoding method and a video encoder. The encoding method includes executing selection processing in various graded modes. Execution for the selection processing in a first-stage mode includes executing intra-frame image prediction by vertical, horizontal, average and diagonal prediction modes and selecting the optimal prediction mode according to prediction results. Execution for selection processing in modes higher than second stages includes selecting a direction adjacent to a prediction direction corresponding to the optimal prediction mode obtained in the selection processing in the first-stage mode or a direction adjacent to the prediction direction at intervals, executing intra-frame image prediction in a prediction mode corresponding to the selected prediction direction and selecting the optimal prediction mode according to prediction results. The intra-frame image predictive encoding and the video encoder have the advantages that intra-frame image predictive encoding complexity is reduced, and implementation of real-time video encoding operation is facilitated.

Description

technical field [0001] The present invention relates to the technical fields of image video coding and intra-frame image prediction, in particular to an intra-frame image predictive coding method and a video encoder. Background technique [0002] Image and video compression coding is generally divided into two predictive coding techniques: inter-frame image coding and intra-frame image coding. Intra picture coding utilizes information from already coded picture units of the current frame to predictively encode the currently coded picture unit. [0003] figure 1 Lists the existing intra picture prediction modes. The existing method is to go through all prediction modes, and select the mode with the best performance as the prediction mode of the final prediction unit. Existing methods have superior encoding efficiency, but are highly complex and difficult to encode in real time. Contents of the invention [0004] An embodiment of the present invention provides a method f...

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