Abstract
A shift invariant Walsh power spectrum for real periodic signals is defined, and an algorithm for its computation is presented. The Walsh power spectrum of the boundary angular function φ∗ of Zahn and Roskies (1972) is computed. It is shown that most of the energy of the power spectrum is concentrated in the lower sequency coefficients. A small number of low-sequency coefficients is enough for shape discrimination of closed contours.
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