Watermark

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Watermark

An image in a piece of paper that may be seen more clearly when it is held up to light. This is used in printing some money and passports to prevent counterfeiting. For example, if one holds a $20 American bill up to light, one would see a watermark of Andrew Jackson's face.
References in periodicals archive ?
Finally, the color image reconstruction is applied on modified RGB channels to get watermarked color image IW.
PSNR is a better test to check distortions between original image and watermarked image because it uses mean squared error also.
A watermarked data may undergo certain types of attacks before being reached to the detector or extractor.
It is through the integrity of the extracted watermark that we can tell whether the watermarked image has been changed or manipulated.
where MSE is the mean square error between the original image and the watermarked image, and MAXI is the maximum pixel value of the image which is equal to 255 in our implementations since pixels were represented using 8 bits per sample.
Distribution not only involves distributing the watermarked content but also highlights the issues of the usage model: how the content owner wants users to use the marked content and what capabilities he or she is willing to provide those users.
The resultant watermarked primary watermark image (obtain from the previous sub-section) is the watermark for the host image and it is used for the following embedding algorithm.
Standard watermarking [ILLUSTRATION FOR FIGURE 5a OMITTED] involves the creation of a watermarked image by encoding a signature into an original image.