Finding Edges
Edge Profile
Edges as Geometric Features
Ideal Edge
"Real" Edges
From Edge to Edgel
Four Edgels in a 3 x 3 Region
Edgel Definition
Facetted Edge Model
- Equation of a plane
- (x, y) are pixel coordinates
- z is grayscale (brightness)
- Coefficients found from least-squares
- Equation is also Taylor series about center pixel
Facetted Edge
Edgel Finding
Edgel Found
Edge Linking
Point and Edge Structures
Point and Edge Records
Edge Growing
- prepend to ab
- append to cd
- merge ab-cd
- start new edge ef
Edge Merging
Loop formation
Example of Edge Finding
Maintained by John
Loomis, last updated 7 July 1998
