Two Decades of Colorization and Decolorization for Images and Videos. (arXiv:2204.13322v1 [cs.CV])

Colorization is a computer-aided process, which aims to give color to a gray
image or video. It can be used to enhance black-and-white images, including
black-and-white photos, old-fashioned films, and scientific imaging results. On
the contrary, decolorization is to convert a color image or video into a
grayscale one. A grayscale image or video refers to an image or video with only
brightness information without color information. It is the basis of some
downstream image processing applications such as pattern …

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