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Volume: 13 | Article ID: art00023
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Color to Gray and Back: Color Embedding Into Textured Gray Images
  DOI :  10.2352/CIC.2005.13.1.art00023  Published OnlineJanuary 2005
Abstract

We have developed a reversible method to convert color graphics and pictures to gray images. The method is based on mapping colors to low-visibility high-frequency textures that are applied onto the gray image. After receiving a monochrome textured image, the decoder can identify the textures and recover the color information. More specifically, the image is textured by carrying a sub-band (wavelet) transform and replacing band-pass sub-bands by the chrominance signals. The low-pass sub-band is the same as that of the luminance signal. The decoder performs a wavelet transform on the received gray image and recovers the chrominance channels. Registration problems are discussed and examples are presented.

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Karen M. Braun, Ricardo L. de Queiroz, "Color to Gray and Back: Color Embedding Into Textured Gray Imagesin Proc. IS&T 13th Color and Imaging Conf.,  2005,  pp 120 - 124,  https://doi.org/10.2352/CIC.2005.13.1.art00023

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