Frequency Domain-HighPass Filters in image processing.pdf

Frequency Domain-HighPass Filters in image processing.pdf

1. ❖Sharpening Filters
Ideal highpassfilters This has a sharp
discontinuity and hence,
Ringing effect is present
Butterworth highpass
filters
Does not have a sharp
discontinuity and hence
ringing is only observed
for filters of higher
orders.
Gaussian highpassfilters The profile of GHPF is
not as tight as that of
BLPF and hence no
ringing effect is present.

2. Spatial Representation of Freq. Domain HPF

3. Ideal High Pass Example

4. Ideal High Pass (Sharpening) Filters IHPF:

5. Butterworth High Pass Example

6. Butterworth High Pass (Sharpening) Filters BHPF:

7. Gaussian High Pass Example

8. Gaussian High Pass (Sharpening) Filters GHPF: