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Apparatus and method for context-based adaptive binary arithmetic coding of syntax elements

An adaptive binary and syntax element technology, applied in electrical components, digital video signal modification, image communication, etc., can solve the problems of high complexity at the encoder end and decoder end, achieve simplification of storage and complexity, and reduce quantity Effect

Active Publication Date: 2017-05-10
HFI INNOVATION INC
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Problems solved by technology

When a binary bit is encoded using a context, additional memory is required and also creates high complexity at the encoder and decoder

Method used

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  • Apparatus and method for context-based adaptive binary arithmetic coding of syntax elements
  • Apparatus and method for context-based adaptive binary arithmetic coding of syntax elements
  • Apparatus and method for context-based adaptive binary arithmetic coding of syntax elements

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Embodiment Construction

[0027] As mentioned earlier, the use of contexts for syntax element encoding requires additional memory and creates a higher complexity. Embodiments of the invention simplify the number of contexts by using a bypass mode for at least one bin, by sharing contexts with more than one bin, or by a combination of both.

[0028] For example, when the syntax element merge_idx encodes, figure 1 The bins of merge_idx shown in will be processed using the context. The position of the bin is indicated by the bin index binIdx, where the binIdx of the merge_idx is 0 to 3. One context per bin is used in traditional CABAC for merge_idx. Various embodiments according to the present invention may use a bypass mode for at least one bin, allow more than one bin to share a context to reduce the total number of contexts, or use both of the above methods at the same time. When using bypass mode, the bypass mode can be applied to one or more bins whose bin index binIdx belongs to a set, where the...

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Abstract

A method and apparatus for context-adaptive arithmetic coding (CABAC) of a syntax element are disclosed. The bin string corresponding to a syntax element is processed by context- adaptive arithmetic coding with a reduced number of contexts using the bin-level bypass mode, bin-level context sharing, or both. The syntax element belongs to a group comprising merge_idx, ref_idx_lc / ref_idx_10 / ref_idx_l1, pred_type, and cu_qp_delta. In one embodiment, the syntax element corresponds to merge_idx and three bins of the bin string with bin indices corresponding to 1, 2 and 3 are coded in the bin bypass mode. In another embodiment, the syntax element corresponds to ref_idx_lc / ref_idx_10 / ref_idx_l1 and one or more bins of the bin string with bin indices larger than 1 or larger than 2 are coded in the bin bypass mode.

Description

[0001] cross reference [0002] The present invention claims the priority of the PCT patent application with the title of "CABAC Simplification for Some Syntax Elements" and the application number PCT / CN2012 / 070428 filed on January 16, 2012, the entire content of which is quoted hereby and incorporated Merge reference. technical field [0003] The present invention relates to video coding or video processing. More specifically, the present invention relates to context-based adaptive binary arithmetic coding (Context-based Adaptive Binary Arithmetic Coding, CABAC) of syntax elements (syntax elements) with reduced complexity in High Efficiency Video Coding (HEVC). ). Background technique [0004] Arithmetic coding is a well-known efficient data compression method and is widely used in coding standards such as JBIG, JPEG2000, H.264 / AVC, and HEVC. In H.264 / AVC Joint Video Team (JVT) Test Model (JVT Test Model, JM) and HEVC Test Model (HEVC Test Model, HM), context-based adap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/21
Inventor 国玫刘杉雷少民
Owner HFI INNOVATION INC
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