28-01-2013, 04:38 PM
Edge Enhancement
Edge Enhancement.ppt (Size: 934 KB / Downloads: 152)
Image Enhancement
Brightness control
Contrast enhancement
noise reduction
Edge enhancement
Objectives
What are edges?
What are the properties of an edge?
What is edge enhancement?
How is edge enhancement performed?
edge enhancement from first principles
Neighbourhood operators
laplacian
unsharp masking
What are edges ?
Change, or discontinuity, in image brightness between two reasonably smooth regions.
Fundamentally important primitive image characteristics.
Only information in most black and white images.
Conclusion
Gradient of an edge has magnitude and direction.
Adding Laplacian to an image results in edge undershoot and overshoot.
k factor tunes the degree of edge enhancement