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Multi-level effective map scanning

A technology of internal scanning and effective coefficients, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of high computational intensity and expensive memory access operations, etc.

Inactive Publication Date: 2016-09-14
BLACKBERRY 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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Examples

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Embodiment Construction

[0035]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.

[0036] 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 b...

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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 process. The significant-coefficient flags forming the significance map are grouped into consecutive groups, and the significant-coefficient group flag indicates for each group whether the group contains no non-zero significant-coefficient flags. A multi-level scanning order may be used in which the significant coefficient flags are scanned group by group. The group scan order specifies the order in which groups are processed, and the scan order specifies the order in which individual significant-coefficient flags within a group are processed. The bitstream may interleave the significant-coefficient group flags with their corresponding significant-coefficient flags, if present.

Description

technical field [0001] 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 [0002] 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 required for each video frame and the speed at which encoding and decoding often needs to occur. The current state-of-the-art in video coding is the ITU-T H.264 / AVC video coding standard. The standard defines a number of different profiles for different applications, including a main profile, a baseline profile, and so on. A next-generation video coding standard currently under development through a jo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/176H04N19/70H04N19/46H04N19/13H04N19/63H04N19/129H04N19/61H04N19/91H04N19/136H04N19/18H04N19/40
CPCH04N19/129H04N19/13H04N19/136H04N19/176H04N19/18H04N19/40H04N19/46H04N19/61H04N19/63H04N19/70H04N19/91H04N19/132H04N19/60
Inventor 何大可阮·阮计天颖
Owner BLACKBERRY LTD
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