In the image, the edge is adjacent to the gray-scale and different domains consisting of the pixel points. Thus, if the edge enhancement, it should highlight the points between adjacent gray-scale changes. Differential operator can be used to signal changes in the rate of demand and thus to strengthen the role of high-frequency component. If the images on their application, will enable a clear outline of the image. Since we often can not be pre-determined orientation of the outline, so the selection for the differential operator to enhance the outline of midnight, to choose those who do not have the space and the direction of rotation-invariant linear differential operator.

enhance.txt

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