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Further work is described on simple sets of parallel operations that detect "texture edges" (abrupt discontinuities in the average values of local picture properties), as well as spots or streaks that are texturally different from their surrounds.

Major "edges" in a noisy signal or picture can be detected by subtracting averages taken over pairs of adjacent nonoverlapping neighborhoods, but this method does not locate the edges precisely. It has been found that using a product of such differences of averages tends to yield sharply localized edges.