halftone
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A simple implementation of Structure-Aware Halftone (SIGGRAPH'08).
The simple implementation of Structure-Aware Halftone.
Page: http://www.cse.cuhk.edu.hk/~ttwong/papers/structurehalftone/structurehalftone.html
I modified the method.
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the origin algorithm init the halftone image using random distribution of black and white points; I init it using [Ostromoukhov 2001].
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The origin method randomly swaps an arbitrary pair of black and white pixels in the image; while I swap the black and white pixels within a small k by k block and run for all the blocks.
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They use an anneal-like algorothm, I think a single pass is enough, for that the time consumption is very expensive.
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