Colorization Using Optimization

[Colorization Using Optimization](http://www.cs.huji.ac.il/~yweiss/Colorization/index.html#interactive)
> In this paper we present a simple colorization method that requires neither precise image segmentation, nor accurate region tracking. Our method is based on a simple premise: neighboring pixels in space-time that have similar intensities should have similar colors.
This is so cool.

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