Methods and devices for encoding and decoding a data stream representing at least one image that disables post-processing of reconstructed block based on prediction mode
地域：
Issy-les-Moulineaux
摘要
A method for decoding a data stream representative of an image split into blocks. For a current block of the image, an item of information indicating a coding mode among a first and a second coding mode of the current block is decoded from the data stream and the current block is decoded depending on this information. When the coding mode of the current block corresponds to the second coding mode, the current block is reconstructed from a prediction obtained, for each pixel, from another previously decoded pixel belonging to the current block or to a previously decoded block of the image, and from a decoded residue associated with the pixel. At least one processing method is applied to the reconstructed current block for at least one pixel of the current block depending on the coding mode of the current block and/or the coding mode of the neighbouring blocks.
說明書
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A syntax element is coded in the data stream STR to indicate to the decoder which local predictor was used to predict the current block.
In a step E221, a quantization step δ2 is determined. For example, the quantization step δ2 depends on the same quantization parameter as the quantization step δ1 that would be determined in step E210 if the current block was coded according to the first coding mode.
In a step E222, a prediction residue R1 is calculated for the current block. For this purpose, once the local predictor is chosen, for each current pixel of the current block:
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