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Methods and devices for image encoding and decoding

An image coding and coding technology, which is used in image communication, digital video signal modification, electrical components, etc., to achieve the effect of good data compression.

Active Publication Date: 2015-11-25
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The present invention provides an image encoding and decoding method and device to at least solve the problems caused by directly entropy encoding on the matching relationship parameters in the related art

Method used

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  • Methods and devices for image encoding and decoding
  • Methods and devices for image encoding and decoding
  • Methods and devices for image encoding and decoding

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Embodiment 1

[0159] The above value range is divided into K (usually 1

Embodiment 2

[0161] The above value range is divided into L (usually 1

Embodiment 3

[0163] One of the above-mentioned mappings or one of the inverse mappings within the above value range or the sub-value range is a combination of several (usually less than 4) consecutively executed partial mappings or partial inverse mappings.

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Abstract

The invention provides methods and devices for image encoding and decoding. The method for image encoding comprises: conducting matching encoding for pixels of an input video image to obtain one or more matching relationship parameters, wherein the matching relationship parameters are parameters used during construction of predictive values and / or restoring values of the pixels in the image; mapping the matching relationship parameters to obtain map values of the matching relationship parameters; and conducting entropy coding for the map values of the matching relationship parameters. By means of the methods and devices provided by the invention, the problems caused by performing entropy coding directly on the matching relationship parameters in the prior art can be solved, so as to achieve a good data compression effect of entropy coding.

Description

technical field [0001] The present invention relates to digital video compression encoding and decoding, in particular to an image encoding and decoding method and device. Background technique [0002] The natural form of a digital video signal for images is a sequence of images. An image is usually a rectangular area composed of several pixels. If a digital video signal has 50 images per second, then a 30-minute digital video signal is a video image sequence consisting of 30x60x50=90000 images, sometimes referred to as for a video sequence or sequences. Encoding a digital video signal is encoding an image one by one. [0003] In the latest international video compression standard HEVC (High Efficiency Video Coding), when encoding an image, an image is divided into several sub-images of MxM pixels, which are called "Coding Units (CU for short)". The basic coding unit encodes sub-images one by one. Commonly used M sizes are 4, 8, 16, 32, 64. Therefore, encoding a video i...

Claims

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Application Information

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IPC IPC(8): H04N19/91H04N19/182
CPCH04N19/593H04N19/517H04N19/91H04N19/134H04N19/85H04N19/157H04N19/182
Inventor 林涛李明尚国强吴钊
Owner TONGJI UNIV