Research Article

Enclosed Laplacian Operator of Nonlinear Anisotropic Diffusion to Preserve Singularities and Delete Isolated Points in Image Smoothing

Figure 2

The test image, diffusion points and difference images between the test image and the smoothing images for different methods.
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(a) The test image
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(b) The test image with pink test points
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(c) The labeled pink test points
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(d) The first- to the fourth-scale diffusion points for ELONAD
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(e) The first- to the fourth-scale diffusion points for PM method [18]
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(f) The first- to the fourth-scale diffusion points for shock filter [20]
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(g) The first- to the fourth-scale diffusion points for coherence filter [21]
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(h) The difference image for ELONAD
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(i) The difference image for PM method [18]
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(j) The difference image for shock filter [20]
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(k) The difference image for coherence filter [21]