Generating an "evil" mode using edge filters
Cartoons and comics always have both good and bad characters. With the right combination of edge filters, a scary image can be generated from the most innocent-looking people! The trick is to use a small-edge filter that will find many edges all over the image, then merge the edges using a small Median filter.
We will perform this on a grayscale image with some noise reduction, so the previous code for converting the original image to grayscale and applying a 7 x 7 Median filter should be used again (the first image in the following figure shows the output of the grayscale Median blur). Instead of following it with a Laplacian filter and Binary threshold, we can get a scarier look if we apply a 3 x ...
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