Reversible color-to-gray mapping using subband domain texturization
Pattern Recognition Letters
An accurate algorithm for color to gray and back
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Accurate reversible color-to-gray mapping algorithm without distortion conditions
Pattern Recognition Letters
Image and video decolorization by fusion
ACCV'10 Proceedings of the 10th Asian conference on Computer vision - Volume Part I
Improved color to gray and back
Proceedings of the International Conference & Workshop on Emerging Trends in Technology
Securing color information of an image by concealing the color palette
Journal of Systems and Software
Color recovery of black-and-white halftoned images via categorized color-embedding look-up tables
Digital Signal Processing
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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 subband (wavelet) transform and replacing bandpass subbands by the chrominance signals. The low-pass subband 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. The intent is to print color images with black and white printers and to be able to recover the color information afterwards. Registration problems are discussed and examples are presented.