Edge Detection

Updated 25 Sep 2026

•
What it is
- •
  identifying significant spatial changes in image intensity or color that may indicate boundaries
•
Principle
- •
  derivative-like local operators respond to rapid changes
- •
  noise also creates rapid changes, so smoothing may be useful first
•
Output
- •
  an edge-strength image, edge directions, or a binary edge map
•
Caution
- •
  detected edges can arise from texture, lighting, or noise; they are not automatically object boundaries
•
Related
- •
  Spatial Filtering
- •
  Image Sharpening

Linked references 4