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Boundary filtering method for intra-frame prediction

An intra-frame prediction and boundary technology, applied in the field of video coding, can solve problems such as intra-frame prediction block boundary distortion, achieve the effect of improving utility, solving boundary distortion problems, and increasing intra-frame prediction accuracy

Active Publication Date: 2018-03-13
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0008] In order to overcome the deficiencies in the prior art above, the present invention provides a boundary filtering method for intra-frame prediction, which can effectively solve the problem of intra-frame prediction block boundary distortion, and can increase the accuracy of intra-frame prediction and improve the accuracy of intra-frame prediction blocks. coding efficiency

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Embodiment Construction

[0053] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0054] The present invention provides an effective intra-frame prediction filtering method, which uses RDO decision-making to adaptively select whether to perform boundary filtering on the intra-frame prediction block; the proposed intra-frame prediction block filter filters the first N lines or N columns are filtered, and the value of N is associated with the filter coefficient. Since the present invention adopts filter coefficients that decay exponentially relative to the boundary distance, N is the position when the filter coefficient decays to 0. For example, if the attenuation of the filter is 0 in line n, then the value of N is n. The present invention can filter the first 10 rows or the first 10 columns of the intra-frame prediction block at most; adopt the filter coefficient of relative boun...

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Abstract

The invention discloses a boundary filtering method for intra-frame prediction, and relates to the technical field of video coding. The method comprises the following steps: firstly, adaptively selecting whether boundary filtering is performed on intra-frame prediction blocks through a rate distortion optimization decision; during filtering, filtering the front N rows or the front N columns of theintra-frame prediction blocks by an intra-frame prediction block filter with the filter coefficient which has an attenuated relative boundary distance index; and adopting different filtering strengths for different intra-frame prediction blocks sizes. Therefore, the problem of boundary distortion of the intra-frame prediction blocks is solved, the intra-frame prediction accuracy is improved and the coding efficiency of the intra-frame prediction blocks is improved; and meanwhile, the practicability and the robustness of the boundary filtering technology are increased.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a boundary filtering method for intra-frame prediction, which can be used to filter intra-frame prediction blocks to enhance the accuracy of intra-frame prediction, thereby improving the coding efficiency of intra-frame prediction blocks. Background technique [0002] Intra-frame filtering technology is a very effective coding tool for optimizing the boundaries of intra-frame prediction blocks, which can effectively alleviate the distortion at the boundaries of intra-frame prediction blocks. [0003] In the High Efficiency Video Coding (HEVC) standard, the existing method adopts two types of boundary filter technologies for intra-frame prediction. One is for the DC (Direct Current) prediction mode (DC prediction mode), using a two-tap filter (filter coefficient is [1 / 4 3 / 4]) to the first row and first column of the intra prediction block Filtering; the other is to f...

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Application Information

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IPC IPC(8): H04N19/117H04N19/147H04N19/82H04N19/85H04N19/11H04N19/176H04N19/157H04N19/593
CPCH04N19/11H04N19/117H04N19/147H04N19/157H04N19/176H04N19/593H04N19/82H04N19/85H04N19/159
Inventor 王荣刚范逵李革高文
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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