Abstract
This article presents the basic ideas behind transform and subband representations of a signal. Although transform and subband representations appear to be different, in fact, they are equivalent. This theoretical relationship gives useful insights into the design of video processing and compression systems. An application of this result to the design of an adaptive amplitude modulation/demodulation (AM/DM) system for noise reduction of images is described. Also discussed is the AM noise-reduction technique for additive noise, and a method is presented to reduce the AM side information by exploiting the transform representation of an image.
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