Video coding method and system based on HEVC/H.265

Abstract

The invention discloses a video coding method and system based on HEVC / H.265. The method comprises the following steps: acquiring video image data and establishing a virtual background frame; for the ith frame of CU with the depth of l, calculating the inter-frame difference degree BD1 between the ith frame of CU and the CU module at the same position of the adjacent frame and the background difference degree BD1'between the ith frame of CU and the CU module at the same position of the virtual background frame; calculating BDl+1 and BDl+1' of four sub-block CUs divided by the CU for the ith frame of CU with the depth of 1; selecting the optimal inter-frame prediction model based on the division depth l, the BD1 and the BD1', and performing CU division continuing / stopping judgment based on the BD1, the BD1', the BD1+1 and the BD1+1' which are obtained through calculation. According to the method, the calculation complexity brought by inter-frame division can be effectively reduced, and the inter-frame coding complexity brought by traversal calculation rate distortion calculation selection can be reduced.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a HEVC / H.265-based video coding method and system. Background technique [0002] A video file is composed of consecutive image frames, each frame is a still image. Due to the persistence of vision effect of the human eye, when the image frame sequence is played at a certain rate, a continuous video display will be seen. Due to the high similarity between adjacent frames, in order to facilitate storage and transmission, it is necessary to encode and compress the original video to remove redundancy in space and time dimensions. Image and video coding compression technology is the premise of computer video processing. After the video signal is digitized, the data bandwidth is very high, usually above 20Mbps; the video coding technology can usually reduce the data bandwidth to 1-10Mbps, so that the video signal can be saved in computer and process accordingly. [0003...

AI Technical Summary

Problems solved by technology

Therefore, the minimum number of traversals of the inter-frame prediction mode is 1+4+16+256×6=1662 times, and the maximum number of traversals is 1+4+16+256×8=2216 times. The selection of the inter-frame prediction mode in the entire video encoding process The computational complexity is extremely high. Obviously, this traversal calculation process makes the computational complexity of the encoding end very high, and the encoding time consumed by video compression is relatively long, which cannot meet the growing demand for real-time video compression.

[0012] To sum up, the inter-frame prediction process of HEVC introduces a lot of computational complexity, how to effectively reduce the computational complexity of the encoder has become an urgent problem to be solved

Images