Edges and Scale

Origin of Edges

Detecting edges

Effects of noise

Solution:  smooth first

Associative property of convolution

Laplacian of Gaussian

2D edge detection filters

The Sobel operator

The effect of scale on edge detection

Some times we want many resolutions

Gaussian pyramid construction

Subsampling with Gaussian pre-filtering

Subsampling with Gaussian pre-filtering

Subsampling without pre-filtering

Sampling and the Nyquist rate

Image resampling

Image resampling

Image resampling

Resampling filters