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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 ImageFrei & Chen

See Also

Sobel Filter
Prewitt Filter

For more information


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