Patent ID: 6891895
Filing Date: 2005-05-10
Classification: G06F,H04N

Abstract:
1. A method of transforming a digital signal representing a physical quantity into signals of frequency sub-bands distributed in at least two different frequency bands and in at least two different resolutions, comprising the steps of: spatially dividing the signal into first blocks all having a same predetermined first number of samples, transforming each of the first blocks into a plurality of second blocks by a space-frequency transformation, any second block under consideration having a second respective number of samples which depends on the resolution of the second block under consideration and which is inferior to a predetermined third number of samples, and containing samples selected according to their frequency, and grouping second blocks having the same second number of samples and samples selected according to the same frequency band, and issuing from the transformation of spatially adjacent first blocks, in order to form third blocks all having the predetermined third number of samples.