Digital Image Processing
Basic effects
| Frequencial modification |
Low pass filter
Simple 3*3 mask that blur the picture.
Blurring apear beacause of erasing high frequency of the image.
K=9
M=
| 1 | 1 | 1 |
| 1 | 1 | 1 |
| 1 | 1 | 1 |
Hight pass filter
Simple 3*3 mask that sharp the picture.
Sharping apear beacause of erasing low frequency of the image.
K=9
M=
| -1 | -1 | -1 |
| -1 | 4 | -1 |
| -1 | -1 | -1 |
| Edge detection |
Prewitt
Edge detection
K=9
M=
| -2 | -1 | 0 |
| -1 | 0 | 1 |
| 0 | 1 | 2 |
Sobel
Edge detection
K=9
M=
| -2 | -2 | 0 |
| -2 | 0 | 2 |
| 0 | 2 | 2 |
Laplacian
Edge detection
K=9
M=
| 0 | 1 | 0 |
| 1 | -4 | 1 |
| 0 | 1 | 0 |
