A 3D video depth image intra prediction mode selection method

Abstract

The invention discloses a 3D video depth image intra-frame prediction mode selection method. The method comprises the following steps: 1), searching an intra-frame corner of any one depth image through an adaptive corner detection algorithm, and storing the position of the intra-frame corner; 2), selecting an intra-frame coding mode CHIMs commonly used by HEVC for a PU block through a mode rough selection method, and adding the intra-frame coding mode CHIMs to a candidate prediction mode list; 3), judging whether a current PU meets a smoothing condition or not: directly switching to step 6) if the current PU meets the smoothing condition, or else continuing to execute step 4); 4), introducing a classifier for classifying the PU: determining that the current PU is a smooth block if the current PU is classified in a C0 class, and switching to step 6), or else continuing to execute step 5); 5), carrying out the DMM mode calculation, searching an optimal wedge-shaped mode for segmentation, and adding the optimal wedge-shaped mode to a candidate mode list; 6), carrying out the rate distortion calculation of the candidate mode list, and selecting the optimal prediction mode. The method effectively reduces the number of intra-frame prediction mode selections, reduces the coding time needed by the intra-frame prediction, and guarantees the final video quality of a decoding end at a synthesis view angle.

Description

technical field [0001] The invention belongs to the technical field of video encoding and decoding, in particular to a method for selecting a 3D video depth image intra-frame prediction mode. Background technique [0002] As a new generation of international video coding standard, H.265 inherits the previous generation of H.264 and uses macroblocks as the basic unit of coding. The main structure is similar to H.264, mainly including intra prediction, inter prediction, conversion, quantization, entropy coding and other modes; at the same time, H.265 is divided into three parts: coding unit, prediction unit and conversion unit. H.265 can transmit higher-quality video under limited bandwidth, that is, H.265 can transmit video of the same quality with only half the bandwidth of H.264. H.265 uses a variety of methods to reduce the code rate: improve compression efficiency and coding quality, improve robustness and error recovery capability, reduce real-time delay and channel acq...

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Problems solved by technology

[0005] In the actual encoding process, when selecting the optimal intra-frame prediction mode, not only the rate-distortion cost of the 35 intra-frame prediction modes must be calculated, but also the rate-distortion cost of the wedge-shaped partition mode. The increase in computational complexity seriously hinders the 3D- Real-time application of HEVC

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