Variable threshold quantification process in encoding by...

Details Variable threshold quantification process in encoding by... Variable threshold quantification process in encoding by...

H - Electricity

04

N

350/33

H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 1321013

- 15 - ABSTRACT The invention relates to a quantification process in an encoding by transformation for transmission on a low rate link of an image signal, said image signal being processed in the form of blocks, each containing a set of digital data, each block being trans- formed to produce a transformed block of coefficients (Ci) rep- resenting the frequency components of the block, each transformed coefficient of a block being quantified during a scan by comp- arison with quantification levels, the first being called the threshold, the process being characterized in that the quantifi- cation is performed with a threshold (T) able to vary between one transformed coefficient (Ci) and the next (Ci+1) in the scan, depending on whether the transformed coefficient does or does not fulfil the condition -T<Ci<+T. Application to the low rate transmission of image signals. (fig. 1) B 9842.C LB

611658

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