BSB663 Image Processing - Hacettepe Üniversitesipinar/courses/BSB663/lectures/filters.pdf'More effective smoothing filters can be generated ... cleaned using frequency domain filtering

BSB663Image Processing

Pinar Duygulu

Slides are adapted from

Gonzales & Woods,

Emmanuel Agu

Suleyman Tosun

Filters

Spatial Filter

Average (Mean) of a 3x3 neighborhood

Smoothing an image by averaging

Smoothing an image by averaging

Smoothing as filtering

Smoothing as filtering

Filter

What does this filter do?

What does this filter do?

Mean filters: effect of filter size

Convolution

Weighted smoothing filters

Computation range

What to do at image boundaries?

Gaussian Filter

Difference Filters

Mathematical Properties of convolution

Separability

Gaussian Kernel

Seperability of Gaussian

Impulse (or Dirac) Function

Noise

Non-linear filters

Median Filter

Weighted Median Filter

Outlier removal