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Devices and methods for context reduction in last significant coefficient position coding

一种上下文、最末的技术，应用在视频编码领域，能够解决降低带宽要求、原始变换块质量损失等问题

Active Publication Date: 2015-10-21
GOOGLE TECHNOLOGY HOLDINGS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transform coding using quantization is a type of data compression that is generally "lossy" in that the quantization of a transform block taken from a source image typically discards data associated with the transform block in the source image, thereby reducing its bandwidth requires but also often results in a loss of quality in the reproduction of the original transformed block from the source image

Method used

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  • Devices and methods for context reduction in last significant coefficient position coding
  • Devices and methods for context reduction in last significant coefficient position coding
  • Devices and methods for context reduction in last significant coefficient position coding

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Embodiment Construction

[0027] In this disclosure, the term "coding" refers to encoding as it occurs at an encoder or decoding as it occurs at a decoder. Similarly, the term encoder refers to an encoder, a decoder or a combined encoder / decoder (CODEC). The terms encoder, encoder, decoder, and CODEC all refer to a specific machine designed for the encoding (encoding and / or decoding) of imagery and / or video data consistent with this disclosure. Image and video data generally consists of three components - a luma component representing the brightness of a pixel and two chrominance components representing the color information of a pixel.

[0028] This discussion begins with a very brief overview of some terms and techniques known in the field of digital image compression. This overview is not intended to teach the known art in detail. Those skilled in the art know how to find further details in textbooks and in relevant standards.

[0029] An example of a video system in which embodiments of the pres...

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PUM

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Abstract

In one embodiment, a method of video encoding is disclosed, the method comprising: encoding a position of a last non-zero coefficient within a video block having a first width, wherein the position of the last non-zero coefficient is provided as a string of binary values, wherein each binary value in said string corresponds to a bin index value; and determining a context index value for each bin index value, wherein the context index value for each bin index value is configured to be shared across two or more blocks of different widths.

Description

technical field [0001] The present invention relates generally to the field of video coding, and more particularly to systems, devices and methods for reducing the number of contexts used in coding the last transform position. [0002] Cross References to Related Applications [0003] This application claims U.S. Provisional Patent Application No. 61 / 595,072, filed February 4, 2012, entitled "Chroma Context Reduction for Last Coefficient Position Coding in HEVC," filed February 5, 2012, and entitled U.S. Provisional Patent Application No. 61 / 595,138 for "Chroma Context Reduction for Last Coefficient Position Coding in HEVC," and U.S. Provisional Patent Application No. 61 / 595,138, filed February 9, 2012, entitled The benefit of US Provisional Patent Application No. 61 / 597,033, which is hereby incorporated by reference in its entirety. Background technique [0004] Video compression uses block processing for many operations. In block processing, blocks of adjacent pixels a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/91
CPCH04N19/00945H04N19/102H04N19/13H04N19/91H04N19/90
Inventor 方雪K·帕纽索庞王利民
Owner GOOGLE TECHNOLOGY HOLDINGS LLC