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n.
In computational theories of vision, a location where the luminance in a smoothed or blurred visual image changes abruptly. Zero-crossing segments that align with one another for different levels of smoothing form the basis of contours in the primal sketch. [So called because in mathematical terms it is a region where the second derivative of the luminance function changes from positive through zero to negative or from negative through zero to positive]
Subjects: Psychology.
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