Fast screen content coding method based on spatiotemporal correlation

Abstract

The invention discloses a fast screen content coding method based on spatiotemporal correlation. According to the fast screen content encoding method disclosed by the invention, a CU division module based on spatiotemporal correlation firstly calculates an absolute frame difference between a current frame CU and the CU at the same position of a previous frame and divides the CUs into two categories; then the CU division module based on spatiotemporal correlation judges that the current CU terminates division in advance or judges that the current CU only performs PLT mode prediction according to the correlation between the current frame CU and a spatiotemporal adjacent CU of the current frame CU on depths and intra-frame prediction modes; a mode selection module based on spatiotemporal correlation skips a specific prediction mode by means of the mode correlation between the current CU and the spatiotemporal adjacent CU of the current CU; and a CU division module based on coding bits firstly obtains the threshold of a CU coding bit under each depth via a CU hit rate and a curve chart of the coding bits, and terminates the CU division in advance if the coding bit of the current CU issmaller than the threshold. By adoption of the fast screen content coding method disclosed by the invention, the CU division complexity is reduced, the selection process of the intra-frame predictionmodes is simplified, and the SCC coding efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of screen content coding (SCC), in particular to a low-complexity fast SCC intra-frame video coding method. Background technique [0002] In recent years, with the application of high-definition and ultra-high-definition video (resolution up to 4K×2K, 8K×4K) into people’s field of vision, video compression technology has been greatly challenged. In addition, various video applications are emerging with the development of network and storage technologies. The diversification of video applications and the trend of high-definition put forward higher requirements for video compression performance. To this end, in April 2010, ITU-T's Video Coding Experts Group (VCEG) and ISO / IEC's Moving Picture Experts Group (MPEG) established the Video Coding Joint Development Team (JCT-VC) to jointly formulate a new generation of video coding standards. , completed the High Efficiency Video Coding HEVC (High Efficiency Video...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the shortcomings of the existing SCC video coding complexity, and propose a fast screen content coding method based on spatio-temporal correlation, which can reduce the complexity of coding while ensuring the coding quality, and is especially suitable for the needs of screen video Real-time compression occasions, such as various portable mobile terminal equipment