Fast intraframe coding method of 3D-HEVC depth videos

Abstract

The present invention discloses a fast intraframe coding method of 3D-HEVC depth videos; a depth video frame is smoothed, namely preprocessed, before coding, so as to reduce the airspace complexity and improves the coding performance and the quality of virtual viewpoints; the preprocessed depth video frame is smoother, and the maximum division depth of more maximum coding units focuses on 0 and 1, so a BP neural network is used for actively learning and predicting the maximum division depth of the maximum coding unit; then, the predicted maximum division depth is corrected according to the maximum division depth of the maximum coding unit in a corresponding color video frame and an edge texture information assignment of the coding unit in the depth video frame, the division of the coding unit is terminated early, while an execution range of a prediction mode of each layer of coding units is decided early according to the statistical results of the prediction mode of each layer of coding units and the predicted maximum division depth of the maximum coding unit; and finally, the coding rate distortion performance is improved, while the coding complexity is reduced significantly.

Description

technical field [0001] The present invention relates to a coding technology of a multi-viewpoint video signal, in particular to a fast intra-frame coding method of a 3D-HEVC depth video. Background technique [0002] With the continuous advancement of video technology, 3D (Three-dimensional) video technology has been widely used in many aspects such as consumer entertainment, video conferencing and telemedicine. At present, the Free Viewpoint Video (Free Viewpoint Video, FVV) system based on Multiview Video plus Depth (Multiview Video plus Depth, MVD) is the main implementation of 3D video. In the FVV system, the audience can freely choose the viewing angle to better obtain an immersive visual experience, and in order to achieve this goal, it is necessary to obtain enough viewpoints. In the MVD format video, the existing real viewpoint can be used to obtain enough virtual viewpoints through DepthImageBasedRendering (DIBR) technology, in which the depth video represents dist...

AI Technical Summary

Problems solved by technology

Statistics show that the encoding time of 3D-HEVC depth video is about 10 times that of color video, which is unreasonable for depth video with simpler texture

[0004] At present, many scholars have proposed methods to reduce the complexity of 3D-HEVC depth video intra-frame coding, but these methods are focused on reducing the execution of DMMs or proposing new depth video intra-frame prediction modes to replace DMMs, these methods reduce 3D-HEVC The intra-frame encoding time of depth video is limited, mainly because these methods do not consider that depth video is relatively simple, and the optimal CU depth is mainly concentrated in 0 and 1.

For the estimated depth video, it is not processed in advance before encoding to improve encoding and rendering performance

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