Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images
First Claim
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1. A method for decoding a stream of coded data representative of a sequence of images divided into blocks comprising the following steps for a current block:
- reconstructing a residual block of residual data from the decoding of a first part of the coded stream of data relating to the current block,determining a prediction block,reconstructing the current block by merging said residual block and said prediction block,said method further comprises a step of reorganisation of residual data in said residual block before the reconstruction of said current block according to the content of said prediction block, wherein the step of reorganisation of residual data in said residual block comprises the following steps;
calculating, for at least two spatial directions, an energy level of spatial gradients of the prediction data, anddetermining the reorganisation of residual data according to the spatial direction corresponding to the lowest energy level.
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Abstract
A method for decoding a stream of coded data representative of a sequence of images divided into blocks is described. It comprises the following steps for a current block:
- reconstructing a residual block of residual data from the decoding of a first part of the coded stream of data relating to the current block,
- determining a prediction block, and
- reconstructing the current block by merging the residual block and the prediction block,
According to the invention, the decoding method comprises in addition a step of reorganisation of residual data in the residual block before the reconstruction of the current block according to the content of the prediction block.
The invention also relates to a method for coding.
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Citations
8 Claims
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1. A method for decoding a stream of coded data representative of a sequence of images divided into blocks comprising the following steps for a current block:
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reconstructing a residual block of residual data from the decoding of a first part of the coded stream of data relating to the current block, determining a prediction block, reconstructing the current block by merging said residual block and said prediction block, said method further comprises a step of reorganisation of residual data in said residual block before the reconstruction of said current block according to the content of said prediction block, wherein the step of reorganisation of residual data in said residual block comprises the following steps; calculating, for at least two spatial directions, an energy level of spatial gradients of the prediction data, and determining the reorganisation of residual data according to the spatial direction corresponding to the lowest energy level. - View Dependent Claims (2, 3, 4, 5)
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5. A method for decoding according to claim 1, wherein the step of reorganisation of residual data in said residual block also comprises a step of calculation of an additional energy level from the energy levels of spatial gradients calculated in at least two spatial directions.
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6. A method for coding a sequence of images divided into blocks comprising the following steps for a current block:
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determining a prediction block for said current block, determining a residual block of residual data by extracting from said current block said prediction block, coding said residual block, said method further comprises a step of reorganisation of residual data in said residual block before its coding according to the content of said prediction block, wherein the step of reorganisation of residual data in said residual block comprises the following steps; calculating, for at least two spatial directions, an energy level of spatial gradients of the prediction data, and determining the reorganisation of residual data according to the spatial direction corresponding to the lowest energy level. - View Dependent Claims (7, 8)
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Specification