Frei & Chen
The Frei and Chen module is used to detected edges with an image.
The Frei and Chen edge detection technique is less sensitive to noise than other edge operators.
The final pixel value is the ratio between the mulitiplication of four kernals with
the surrounding pixel neighborhood and the square sum of all pixels. The following
are the kernals used to multiply the pixel neighborhood:
| +2 |
+3 |
+4 |
|
+2 |
0 |
-2 |
|
+3 |
0 |
-3 |
|
+2 |
0 |
-2 |
| 0 |
0 |
0 |
|
0 |
-2 |
+3 |
|
+2 |
0 |
-2 |
|
-3 |
+2 |
0 |
| -2 |
-3 |
-2 |
|
+3 |
-2 |
0 |
|
-2 |
0 |
+2 |
|
0 |
+2 |
-3 |
Example
| Source Image | Frei & Chen |
 |
 |
See Also
Sobel Filter
Prewitt Filter
For more information
IMap-Vision
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