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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“Women were formed to temper Mankind, and sooth them into Tenderness and Compassion; not to set an Edge upon their Minds, and blow up in them those Passions which are too apt to rise of their own Accord.”
—Joseph Addison (1672–1719)