Depth image intra-frame encoding and decoding methods, devices and encoder and decoder

Abstract

The invention provides depth image intra-frame encoding and decoding methods, devices and an encoder and a decoder. The encoding method is applied to three-dimensional video encoding or multi-view video encoding, and comprises the steps of: judging whether to adopt an intra-frame skipping encoding mode when carrying out intra-frame encoding on a prediction unit of a depth image; setting the residual error data of the prediction unit to zero if determining to adopt the intra-frame skipping encoding mode, and not carrying out encoding on the residual error data. The decoding method is applied to three-dimensional video decoding or multi-view video decoding, and comprises the steps of: judging whether an encoder end adopts the intra-frame skipping encoding mode when carrying out intra-frame decoding on the prediction unit of the depth image; setting the residual error data of the prediction unit to zero if determining that the encoder end adopts the intra-frame skipping encoding mode, and not carrying out decoding on the residual error data. According to the invention, the code rate needed in the process of depth image encoding is lowered; on the basis that the efficiency of encoding and decoding is improved, the structure of the existing image is not damaged; and the realization of hardware is facilitated.

Description

technical field [0001] The present invention relates to the technical field of video encoding and decoding, in particular to a depth image intra-frame encoding and decoding method, device and codec. Background technique [0002] In 3D video coding or multi-view applications, depth images can be used to provide more flexible views. Depth information is different from texture information. It is not used for direct display, but is first converted into disparity vector, and then used together with texture information to generate a synthetic viewpoint. [0003] In the process of generating a synthetic view, the distortion of the depth block has little effect on the distortion of the synthetic view in the following two cases: 1. The distortion of the depth value does not cause the distortion of the disparity information, 2. The area near the texture value corresponding to the current depth value Very smooth. [0004] It can be seen from the above that in the above two cases, the...

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Problems solved by technology

[0004] To sum up, in the above two cases, the residual error of encoding or decoding the depth block needs to occupy the code rate but cannot bring about the improvement of the quality of the synthetic view

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