Sandipan Dey walks through a paper on colorization and shows some examples:

Colorization is a computer-assisted process of adding color to a monochrome image or movie. In the paper the authors presented an optimization-based colorization method that is based on a simple premise:

in space-time that haveneighboring pixelsshould havesimilar intensities.similar colorsThis premise is formulated using a

quadratic cost functionand as anoptimization problem. In this approach an artist only needs to annotate the image with a fewcolor scribbles, and the indicated colors areautomatically propagatedin both space and time to produce a fully colorized image or sequence.In this article the optimization problem formulation and the way to solve it to obtain the automatically colored image will be described for the images only.

It’s an interesting approach.

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