6.17. Applications
All the transforms we have studied in this chapter are good candidates for feature generation, and they have been used extensively in various pattern recognition tasks. However, the wavelet transform offers an extra advantage, which in some cases can be beneficially exploited. Its multiresolution properties conform to the way perception is achieved by humans, through their hearing and visual systems. The human ear exhibits decreasing resolution at higher frequencies, in a way that is uniform on a logarithmic scale (octave bands) [Flan 72]. Experiments in psychophysics and physiology show that the human visual cortex perceives by decomposing the stimuli in a number of frequency bands [Camp 68, Levi 85], which are also dependent ...
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