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For example: What algorithm is used to generate the image by the fresco filter in Adobe Photoshop?
Do you know some place where I can read about the algorithms implemented in these filters?
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Feature detection algorithmMarr–Hildreth algorithm: It is an early edge detection algorithm. Canny edge detector algorithm: Canny edge detector is used for detecting a wide range of edges in images. Generalized Hough transform algorithm. Hough transform algorithm.
Filtering is a technique for modifying or enhancing an image. For example, you can filter an image to emphasize certain features or remove other features. Image processing operations implemented with filtering include smoothing, sharpening, and edge enhancement.
Lode's Computer Graphics Tutorial
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The source code for GIMP would be a good place to start. If the code for some filter doesn't make sense, at least you'll find jargon in the code and comments that can be googled.
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