Appl. Sci. 2023 , 13 , 1389
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• cropping obtained images to the following regions: the examined paper sample, the checkerboard on the movable handle, and the checkerboard on the fixed handle, • linear filtering of the sample image by means of a filter that enhances the vertical edges in the image; its mask is shown in Figure 3, • linear filtering of checkerboard images using a filter that emphasizes the corners of the checkerboard fields in the image; its mask is shown in Figure 4.
Figure3. Filter mask designed to emphasize edges in an image.
Figure4. Filter mask designed to emphasize checkerboard corners in an image.
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