Patent ID: 11863751
Assignee: ORANGE
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A device for decoding a coded data stream representative of at least one image, said image being split into blocks, wherein the decoding device comprises:
a processor (PROC0) configured, for at least one block of the image, referred to as a current block, to:
decode an item of information indicating a coding mode of the current block,
determining the coding mode of the current block from among at least a first and a second coding mode, the first coding mode corresponding to a type of coding mode using a transform of the prediction residue before quantizing the coefficients and the second coding mode corresponding to a type of coding mode using no transform of the prediction residue before quantizing the coefficients,
obtaining a quantization parameter,
when the coding mode of the current block corresponds to the first coding mode, decode the current block by determining a first quantization step according to the quantization parameter to dequantize, in a transform domain, a prediction residue associated with the current block,
when the coding mode of the current block corresponds to the second coding mode, decode the current block by determining a second quantization step according to the quantization parameter to dequantize, in a spatial domain, a prediction residue associated with the current block.