Edge detection is a fundamental tool in image processing, machine vision and computer vision, particularly in the areas of feature detection and feature extraction, which aim at identifying points in a digital image at which the image brightness changes sharply or, more formally, has discontinuities. The same problem of finding discontinuities in 1D signals is known as step detection.
Read more about Edge Detection: Motivations, Edge Properties, A Simple Edge Model, Why Edge Detection Is A Non-trivial Task, Approaches
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“The self-consciousness of Pine Ridge manifests itself at the village’s edge in such signs as “Drive Keerful,” “Don’t Hit Our Young ‘uns,” and “You-all Hurry Back”Mlocutions which nearly all Arkansas hill people use daily but would never dream of putting in print.”
—Administration in the State of Arka, U.S. public relief program (1935-1943)