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

Claim 18:
19. A coding device for coding a coded data stream representative of at least one image, said image being split into blocks, wherein the coding device comprises:
a processor configured, for at least one block of the image, referred to as a current block, to:
code 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, code the current block by determining a first quantization step according to the quantization parameter to quantize a prediction residue associated with the current block in a transform domain,
when the coding mode of the current block corresponds to the second coding mode, code the current block by determining a second quantization step according to the quantization parameter to quantize a prediction residue associated with the current block in a spatial domain.