Non-linear filters Flashcards
1
Q
Is median filtering non-linear?
A
No
2
Q
What is salt and pepper noise?
A
White spots caused by false saturation, and dark spots caused by a failed response - caused by failed sensors
3
Q
What is median filtering used to fix?
A
Salt and pepper noise
4
Q
Mean and gaussian filters are both…
A
Diffusion processes
5
Q
Meaning of anisotropic
A
- not the same in all directions, we consider the likelihood a pixel will be similar to those close to it
6
Q
Basically, whats the difference between mean/guassian filters and anisotropic filters?
A
Mean and gaussian: make pixels more like its neighbours
Anisotropic: makes a pixel more like its neighbours that its already similar too
7
Q
What type of filtering is bilateral filtering?
A
non-linear
8
Q
What is bilateral filtering used for?
A
Smoothing and edge preserving
