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 ?
In this algorithm, speech watermark information is divided into two portions and then inserted into wavelet coefficients of red channel and blue channel of the color face image.
In this algorithm, multiple watermark logos are inserted into LH and HL subbands of the host image.
Transmitter part performs the coding and watermark embedding in the cover image.
They include one spatial domain technique and three transform domain watermark embedding techniques.
We select the primitives to watermark as the way mentioned before.
A watermark can prevent illegal regeneration of copies of the marked data.
In a closed system in which the multimedia content needs special hardware for copying and viewing, a digital watermark can be inserted to indicate the number of copies permitted.
Due to its excellent spatio-frequency localization properties, the DWT is very suitable to identify areas in the host image where a watermark can be embedded effectively.
White Paper Produced by Collaboration of Leading Technology and Entertainment Industry Groups, Including the DWA and MPAA, Describes How Digital Watermarks Can Benefit Both Consumers and Content Owners
Watermark detection is achieved through comparison with the original un-watermarked image.
One by-product of this process is the watermark - the technique of impressing into the paper a form, image, or text derived from the negative in the mold, as the paper fibers are squeezed and dried.