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Re:Anime2Sketch: A sketch extractor for illustration, anime ... by gregoriol on Friday May 07, 2021 @11:53AM (#27077195)
Your edge detection examples are really basic stuff: there are way more advanced studies and examples.

Search for example for "Coherent Line Drawing" by Henry Kang (image from the research: https://d3i71xaburhd42.cloudfront.net/92b2ec5ef4f58c4206fc5c...) or for "XDoG: An eXtended difference-of-Gaussians ..." by Holger Winnemoller, Jan Eric Kyprianidis, ... (https://ars.els-cdn.com/content/image/1-s2.0-S00978493120004...)

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