In the image, the edge is constituted by the pixel dots of different gray level and an adjacent domain points. Thus, if you want to enhance edges, it should be highlighted the gray level changes between adjacent points. The differential operator is used to find the rate of change of the signal, which has the role of strengthening the high-frequency component. If its application in the image on the outline of the image can be clear. Often not possible to determine the orientation of the contour, and thus the selection differential operator midnight, you must select those who do not have the space directional rotation invariant linear differential operator for edge enhancement.

Ienhancen\enhance.txt
Ienhancen

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