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 ?
Secure spread spectrum watermarking for multimedia, IEEE Transactions on Image Processing 6(12) 1673-1687.
(1997) Secure Spread Spectrum Watermarking for Multimedia.
DST is an appropriate way for image watermarking, that it achieved high performance for determine the directional features also the optimal localization [1], In this paper, we used Finite Discrete Shearlet Transform (1) (FDST) for spread spectrum watermarking [24].

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