An efficient, real-time, method for transmitting Walsh-Hadamard transformed pictures
N. Bourbakis, Nikitas A. Alexandridis · 2005
This paper presents an efficient method for transmitting regularly-decomposed pictures which have been coded through an orthogonal Walsh-Hadamard transformation. The regular-decomposition procedure converts the picture into a tree representation and compresses the original amount of data by not retaining non-informative areas of the picture. The Walsh-Hadamard transformation is performed on the regularly-decomposed picture as an averaging or smearing process to allow transmission which is more immune to channel errors. It also makes bandwidth reduction possible because, since the image energy which is usually uniformly distributed in the spacial domain now tends to be concentrated near the origin of the transform domain, some of the low-magnitude samples may be discarded. A conceptual design is given where the three steps of regular-decomposition, Walsh-Hadamard transformation, and transmission, instead of being performed sequentially one after the other, are now carried out simultaneously.