Edge Detection

Announcements

Edge detection

Origin of Edges

Edge detection

Images as functions…

Image gradient

The discrete gradient

The discrete gradient

The Sobel operator

Effects of noise

Solution:  smooth first

Derivative theorem of convolution

Laplacian of Gaussian

2D edge detection filters

The Canny edge detector

The Canny edge detector

The Canny edge detector

The Canny edge detector

Non-maximum suppression

Effect of s (Gaussian kernel spread/size)

Edge detection by subtraction

Edge detection by subtraction

Edge detection by subtraction

Gaussian - image filter