Overview

zero-crossing


Show Summary Details

Quick Reference

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.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.