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3D (three dimensional) video depth image intra-frame predicting mode selecting method and system

An intra-frame prediction mode and depth image technology, applied in the field of video coding and decoding, can solve the problems of high intra-frame coding complexity and inability to realize real-time application of computing power, so as to ensure video quality, reduce time, and improve coding speed Effect

Inactive Publication Date: 2014-10-29
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0013] Although the above intra-frame prediction mode selection method reduces the intra-frame prediction coding time of the depth image by one time, the complexity of the intra-frame coding of the depth image is still too high, and the current common multimedia terminals (including mobile phones, Tablet PC, digital video camera) computing power cannot realize its real-time application, which also becomes an important obstacle to the commercialization of 3D video in these mobile multimedia terminals in the future

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[0085] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0086] During the intra-frame prediction of the depth image, it is necessary to obtain the adjacent reference pixel values ​​of the lower left, left, upper left, upper and upper right of the current block. In the present invention, the adjacent reference pixels of the current block are stored in a one-dimensional array of the storage unit, and are sequentially numbered from bottom to top and from left to right as the index of the reference pixels. Such as Figure 7 As shown, it is 4*N+1 reference pixels and reference pixel indexes of an NxN prediction block, where N is equal to 8.

[0087] The present invention only proposes the intra-frame prediction mode selection method of the depth image, and does not involve the decision of the coding unit, ...

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Abstract

The invention discloses a 3D video depth image intra-frame predicting mode selecting method and system. The method comprises, firstly, computing the variance of an inter-frame predicting reference pixel set of an HEVC (high efficiency video coding) current block, and predicting whether the current block is a smooth block through the variance; if so, taking two inter-frame predicting modes of Planar and SDC_Planar; if not, dividing the reference pixel set of the current block into two reference pixel sets, and determining whether the current block is a boundary block according to the pixel variance of the two reference pixel sets; if so, predicting an effective HEVC inter-frame predicting mode, an effective depth model mode and the effective direction of an effective wedge splitting mode according to the distribution characteristics of a current reference pixel. The 3D video depth image intra-frame predicting mode selecting method and system effectively reduces the number of candidate depth inter-frame predicting modes of smooth areas and boundary areas, reduce the coding time required by inter-frame prediction, increase the coding speed and guarantee the final video quality of the synthesis perspective of a decoding end.

Description

technical field [0001] The invention belongs to the technical field of video encoding and decoding, and in particular relates to a method and system for selecting a 3D video depth image intra-frame prediction mode. Background technique [0002] In January 2013, the Joint Video Development Group released the next-generation international video coding standard HEVC, also known as H.265. H.265, like the previous generation of video coding standard H.264, adopts a mixed block-based coding structure, but H.265 introduces coding unit structure, transformation unit structure, inter-frame asymmetric segmentation, unified intra-frame coding, and merging ( merge) mode, improved motion vector coding and other new technologies. Due to the introduction of new technologies, compared with H.264, the new video coding standard HEVC can reduce the bit rate by half while obtaining the same reconstructed video quality. Coding units in H.265 are an extension of the concept of macroblocks in H....

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Application Information

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IPC IPC(8): H04N19/597H04N19/103H04N19/159
Inventor 伏长虹张洪彬苏卫民
Owner NANJING UNIV OF SCI & TECH
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