Color to Gray and Back transformation for distributing color digital images
This addresses the problem of secure image distribution for database users, though it appears incremental as it builds on existing watermarking techniques.
The paper tackles the problem of protecting color digital images from unauthorized copying by developing a watermarking protocol that embeds color information into the luminosity component of the YUV color space using a block algorithm, enabling distribution among legitimate users while safeguarding originals.
The Color to Gray and Back transformation watermarking with a secrete key is considered. Color is embedded into the bit planes of the luminosity component of the YUV color space with the help of a block algorithm that allows using not only the least significant bits. An application of the problem of distributing color digital images from a data base among legitimate users is discussed. The proposed protocol can protect original images from unauthorized copying.