Multi-level significance maps for encoding and decoding

A coding and effective coefficient technology, applied in image communication, television, electrical components, etc., can solve the problems of expensive memory access operations and high calculation intensity

Active Publication Date: 2013-05-08
VELOS MEDIA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The determination of the context for 16x16 and 32x32 significand maps is quite computationally intensive, since in most cases the processor determines the context by looking up the values ​​of neighboring significands, which involves expensive memory access operations

Method used

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  • Multi-level significance maps for encoding and decoding
  • Multi-level significance maps for encoding and decoding
  • Multi-level significance maps for encoding and decoding

Examples

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Embodiment Construction

[0036] In the following description, some example embodiments are described with reference to the H.264 standard for video coding and / or the developing HEVC standard. Those skilled in the art should understand that the present application is not limited to H.264 or HEVC, but is applicable to other video coding / decoding standards, including possible future standards, multi-view coding standards, scalable video coding standards, and reconfigurable The configured video encoding standard.

[0037] In the following description, the terms frame, picture, slice, tile and rectangular slice group are used somewhat interchangeably when referring to video or images. Those skilled in the art will recognize that, in the case of the H.264 standard, a frame may contain one or more slices. It will also be recognized that, depending on the specific requirements or terminology of the applicable image or video coding standard, some encoding / decoding operations are performed on a frame-by-frame ...

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Abstract

Methods of encoding and decoding for video data are described in which multi-level significance maps are used in the encoding and decoding processes. The significant-coefficient flags that form the significance map are grouped into contiguous groups, and a significant-coefficient-group flag signifies for each group whether that group contains no non-zero significant-coefficient flags. If there are no non-zero significant-coefficient flags in the group, then the significant-coefficient-group flag is set to zero. The set of significant-coefficient-group flags is encoded in the bitstream. Any significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is non-zero are encoded in the bitstream, whereas significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is zero are not encoded in the bitstream.

Description

[0001] Copyright Notice [0002] A portion of the disclosure of this document and accompanying materials contains material to which copyright is claimed. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as published in the Patent and Trademark Office files or records, but reserves all other copyright rights whatsoever. technical field [0003] The present application relates generally to data compression, and in particular to methods and apparatus for encoding and decoding video using multi-level significance maps. Background technique [0004] Data compression occurs in numerous contexts. Data compression is very commonly used in communications and computer networking to efficiently store, transmit and reproduce information. It finds specific application in the encoding of graphics, audio and video. Video presents considerable challenges to data compression due to the large amount of data requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N19/00545H04N19/00278H04N19/00884H04N19/00357H04N19/00127H04N19/00133H04N19/00072H04N19/00175H04N19/00139H04N19/00551H04N19/00369H04N19/132H04N19/136H04N19/18H04N19/70H04N19/119H04N19/134H04N19/147H04N19/176H04N19/192H04N19/196H04N19/46H04N19/463H04N19/13H04N19/60
Inventor 阮·阮计天颖何大可
Owner VELOS MEDIA INT LTD
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