Digital signal and image processing
15 sec
One thing about edges in images
One thing about image edges
Quick check · tap an answer to continue
Lesson notes
Key points
- An edge is just where brightness changes fast, so edge detectors simply measure the gradient between neighbouring pixels.
Takeaway: Edges are where brightness changes fastest.
Quick check: What does a large gradient value signal?
- An edge
- Uniform colour
- Image noise only
A large gradient means brightness changes fast: an edge.
Gradient
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