What is edge detection?

Answer 1

Edge detection generally applies to a square wave signal, such as a clock pulse or a trigger pulse. Then the edge detection comes from either using the rising voltage, or the falling voltage of the signal (usually a square wave) to trigger the next event. Using the falling voltage implies a delay in the signal and the rising pulse to trigger an immediate `step` in the circuit.

Answer 2

Edge detection means highlighting the edges of objects in a photograph (they get illuminated, while all other image points become dark).