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Method for coding and for reconstruction of a block of an image sequence

A technology for encoding and reconstructing images, applied in the general field of image encoding, and can solve problems such as non-uniformity

Inactive Publication Date: 2012-10-31
THOMSON LICENSING SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a predicted block is generally non-uniform with respect to the neighboring blocks of the reconstructed current block

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  • Method for coding and for reconstruction of a block of an image sequence
  • Method for coding and for reconstruction of a block of an image sequence
  • Method for coding and for reconstruction of a block of an image sequence

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Embodiment Construction

[0055] An image contains pixels or image points each associated with at least one item of image data. One item of image data is, for example, one item of luminance data or one item of chrominance data.

[0056] The term "residual" means data obtained after extraction of other data. The extraction is generally the subtraction of the predicted pixels from the source pixels. However, this extraction is more general and involves weighted subtraction in particular.

[0057]The term "reconstructed" denotes data (eg, pixels, blocks) obtained after combining residuals with predicted data. This combination is generally the sum of the predicted pixels and the residual. However, the combination is more general and involves weighted addition in particular. A reconstruction block is a block of reconstructed pixels.

[0058] With regard to image decoding, the terms "reconstruction" and "decoding" are often used synonymously. Therefore, a "reconstructed block" is also denoted by the te...

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PUM

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Abstract

The invention relates to a method for coding a current block comprising the following steps for: - determining (30, 32, 34) a prediction block from the current block, - determining (36) a residue block by extracting from the current block the prediction block, - coding (38) the residue block, the method being characterized in that the prediction block from the current block is determined according to the following steps for: - determining (30) an initial prediction block from motion data and at least one reference image previously coded and reconstructed, - applying (32) an atomic decomposition method on a vector of data Yep, comprising the image data of neighbouring blocks of the current block previously coded and reconstructed and the data of the initial prediction block, and - extracting (34) from the decomposed vector the data corresponding to the current block, the extracted data forming the prediction block.

Description

technical field [0001] The invention relates to the general field of image coding. [0002] The invention relates to a method of coding a block of an image sequence and a corresponding method of reconstructing such a block. Background technique [0003] Referring to FIG. 1 , it is known in the prior art to encode a current block Bc of pixels belonging to a current image of a sequence of several images by spatial or temporal prediction. For this purpose, it is known in the prior art that in the case of spatial prediction from pixels spatially adjacent to a previously reconstructed current block, or from other images, called reference images, besides the previously reconstructed current image Determine the prediction block Bp for the current block Bc to be encoded in the pixels. [0004] During a step 12, a residual block Br is determined by extracting a prediction block Bp from the current block Bc. [0005] During a step 14, the residual block is encoded in stream F. Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/34H04N7/36H04N19/593
CPCH04N19/00278H04N19/00763H04N19/00733H04N19/00024H04N19/00975G06T9/004H04N19/105H04N19/176H04N19/51H04N19/593H04N19/97G06T7/00
Inventor A.马丁D.索罗E.弗朗索瓦J.维尔隆
Owner THOMSON LICENSING SA