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Method for encoding block of coefficient

A coefficient block, coding technology, applied in the field of image coding

Inactive Publication Date: 2012-12-19
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0042] And the (m, n) parameter storage of the initialization process requires a lot of space, and the CABAC Main Profile needs about 6400bytes. Initialize the calculation process of each ctx It's also complex, involving a multiplication, a shift, and an addition

Method used

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  • Method for encoding block of coefficient
  • Method for encoding block of coefficient

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Embodiment Construction

[0112] The H.264 coefficient block encoding scheme first scans the coefficient blocks into a one-dimensional array according to a certain predetermined scanning order and then encodes them, while the present invention directly encodes the original coefficient blocks, so the process of scanning and reverse scanning for the coefficient blocks can be omitted .

[0113]In order to facilitate understanding of the present invention, each noun involved in the present invention is firstly explained below.

[0114] 1. Definition of article

[0115] There are 5 types of optional bar patterns in the present invention:

[0116] Bar: One line of the coefficient block is a bar, which is recorded as the 0th to 7th bar from top to bottom.

[0117] Vertical bar: A column of the coefficient block is a vertical bar, which is recorded as the 0th to 7th vertical bar from left to right.

[0118] Diagonal bar: Each 45-degree slanted line element from the lower left to the upper left in the coeffi...

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Abstract

A method for encoding coefficient blocks mainly includes steps of: firstly, dividing a coefficient block which has been transformed and quantized during picture encoding into several slice groups according to a predetermined rule, wherein slice group can be horizontal slice group, vertical slice group, inclined slice group, J slice group, and inverse L slice group; then, encoding said blocks based on said each slice group. An apparatus for encoding coefficient blocks is also provided here. Though the solution of the invention, encoding efficient is further improved, and better compression efficient is provided when the complexity of the invention is equal to the one of H.264, simultaneity, the process of scanning and scanning back can be left out.

Description

technical field [0001] The present invention relates to the technical field of image coding, in particular to a method for coding coefficient blocks. Background technique [0002] At present, image compression coding standards include: moving image coding standards H.261 and H.263 formulated by ITU-T Video Coding Experts Group (VCEG); still image coding standards JPEG and H.263 formulated by ISO / IEC Moving Picture Experts Group (MPEG). JPEG2000, moving image coding standards MPEG1, MPEG4-Part2; international video coding standards MPEG2 / H.262, H.264 / AVC; audio and video coding standard AVS moving picture coding standard, etc. [0003] Moving image video coding includes the following basic steps: prediction, residual, transformation, quantization and coding. Still image coding includes the following basic steps: transformation, quantization and coding. [0004] The sizes of the transformed and quantized coefficient blocks include 16×16, 8×8, 4×4, 2×2 and other types. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32
CPCH04N19/00278H04N19/00272H04N19/00775H04N19/00109H04N19/129H04N19/174H04N19/176H04N19/60
Inventor 何芸余微杨平孟新建
Owner HUAWEI TECH CO LTD
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