Fast mode selection method for H.266/VVC screen content coding

Abstract

A fast mode selection method for H.266 / VVC screen content coding comprises the following steps: 1) calculating a corner proportion of a currently input screen video frame, and dividing the currently input screen video frame into a low-contrast screen video frame and a high-contrast screen video frame according to the corner proportion; 2) for a low-contrast screen video frame, dividing a current coding CU into a foreground CU and a background CU according to whether the current CU has an angular point, and then respectively performing corresponding mode detection; 3) for a high-contrast screen video frame, detecting whether the current CU has an angular point or not, if the angular point is not detected, determining that the current CU is a background CU, and turning to step 4), otherwise, determining that the current CU is a foreground CU, and turning to step 5); 4) dividing the background CU into a screen content background CU and a natural content background CU according to the CU activity and the average brightness difference, and then respectively performing corresponding mode detection; and 5) performing corresponding mode detection according to whether the adjacent CU uses the IBC or PLT prediction mode. According to the method, the coding time of the low-contrast screen video frame can be greatly reduced, and the coding complexity is reduced.

Description

Technical field [0001] The present invention relates to the field of video coding, particularly refers to a H.266 / VVC screen content encoding fast mode selection method. Background technique [0002] With the application scenario of remote office / online education, the coding and transmission of screen content (such as PPT, document, form, etc.) have become the focus of academia and industrialism. In order to meet the high-efficiency storage and transmission requirements of the screen video on the effective bandwidth, the latest generation international video coding encoding formulated by the Video Coding Expert Group (VCEG) and the Motor Image Expert Group (MPEG) is formed into a joint video expert group (JVEG) (H. 266 / VVC) covers screen content encoding. This standard introduces a series of high-coded performance screen coding tools, such as intra block replication (IBC), palette mode (PLT), adaptive color transformation (ACT), etc., effectively improves screen content cod...

AI Technical Summary

Problems solved by technology

This standard introduces a series of screen coding tools with high coding performance, such as Intra Block Copy (IBC), Palette Mode (PLT), Adaptive Color Transformation (ACT), etc., which effectively improves the coding efficiency of screen content and brings Huge computational complexity

[0003] Compared with the previous generation of video coding standard H.265 / HEVC, H.266 / VVC's finer CU segmentation method makes the existing method unsuitable for CTU-level content classification. Due to the update of prediction mode types and the CU segmentation method The large computational load problem caused by the increase of

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