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 paper we proposed an efficient approach for compressed and encrypted domain watermarking in JPEG 2000 images using spread spectrum watermarking technique.
Blind watermark estimation attack for spread spectrum watermarking.