METHOD AND DEVICE FOR PROGRESSIVE QUANTIZATION, METHOD AND DEVICE FOR INVERSE QUANTIZATION, CORRESPONDING COMPUTER PROGRAMMES, SIGNAL AND DATA SUPPORT

摘要

The invention concerns a method and a device for progressive quantization, a method and a device for inverse quantization, corresponding computer programmes, signal and data support. The invention concerns a method for progressive quantization of coefficients, by successive refining operations including, after an initial quantization step (63) performed on each of said coefficients with a predetermined quantization step and delivering quantized data, at least one iteration (65) of the following phases: determining a residue; refining, by quantization of said residue, including, for at least part of the coefficients, the steps of: selecting a quantization value (68) by projecting said reconstruction value on a quantization interval split into two parts corresponding to two predetermined values associated with the quantization indices 0 and 1; estimating a first displacement (69) to be applied to a decoding reconstruction value, based on a predetermined criterion for minimizing a reconstruction error, to form said refining value. The invention also concerns the corresponding decoding.