The discrete two-dimensional Walsh transform is presented as a specific example of a generalized harmonic analysis approach to (visual) image classification. Certain known aspects of biological systems are briefly presented as motivation for this approach, and some computer experiments are referenced and offered as validation of the approach. It is suggested that the mathematics typified by the Walsh transform provides an appropriate description of neural interactions in the primate visual system.
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Carl et al. (1971) studied this question.
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