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Re:Show HN: Trigrad, a novel image compression with interest... by JosephRedfern on Saturday July 04, 2015 @07:17AM (#9829853)
I see - thanks for the explanation!

Have you tried using Canny Edge detection rather than Sobel? It might help a bit with the noise. I've just attempted it, but can't seem to get Canny working under Mono (I've not got a windows machine at the moment).

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