Intraframe coding method, device and encoder for depth images

Abstract

Provided are an intraframe coding method, device and encoder for depth images. The method is applied to 3D video coding or multi-view video coding. The method comprises: in an intraframe coding mode for the depth images, generating a non-all-zero residual and an all-zero residual when a prediction unit is coded; and selecting rate-distortion optimization between the non-all-zero residual and the all-zero residual so as to be used as the residual coding scheme of the prediction unit. The device is applied to 3D video coding or multi-view video coding. The device comprises: a residual generation unit used in an intraframe coding mode for depth images, for generating a non-all-zero residual and an all-zero residual when a prediction unit is coded; and a rate-distortion optimization selecting unit used for selecting rate-distortion optimization between the non-all-zero residual and the all-zero residual so as to be used as the residual coding scheme of the prediction unit. By adopting the method, device and encoder provided by the invention, the code rate required for coding depth images is reduced, and the coding performance is increased.

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 method, device and encoder. 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 residual o...

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Problems solved by technology

[0004] In summary, in the above two cases, the residual of the coded depth block needs to occupy the code rate but cannot improve the quality of the synthetic view.

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