watermark


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watermark:

see paperpaper,
thin, flat sheet or tissue made usually from plant fiber but also from rags and other fibrous materials. It is used principally for printing and writing on but has many other applications. The term also includes various types of paperboard, such as cardboard and wallboard.
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Watermark

 

a picture in a piece of paper, visible when the paper is held up to the light; it is formed during the process of making the paper.

Watermarks began to appear in Europe in the 13th century, and in Russia in the second half of the 17th century. The study of watermarks and the determination of the exact place and time of the making of a piece of paper are very important for the correct interpretation of a source.

Since 1723, Russia, following the example of other European countries, impressed watermarks on stamped paper (a depiction of the state coat of arms and the words“stamped paper”) in order to avoid counterfeiting of official documents and currency. Watermarks are usually made on paper at precise intervals, or they cover the whole field of the paper in the form of a repeated drawing or pattern. They can be used to distinguish genuine money, valuable papers and documents, and stamps from counterfeit items. Watermarks are also used as a means of ornamenting paper. The imprinting of watermarks is usually done with a dandy roll or with cylinders of a cylinder paper-making machine on a wet web of the paper.

N. M. BOKAREVA

watermark

[′wȯd·ər‚märk]
(graphic arts)
A localized modification of the structure and opacity of a sheet of paper so that a pattern or design can be seen when the sheet is held to the light.
References in periodicals archive ?
We compute the bitwise exclusive-OR of the copyright watermark [W.
In this section, we propose a hybrid algorithm in which the watermark bits are not embedded directly on the wavelet coefficients, but rather on the elements of singular values of the matrix V of the original image's DWT sub-bands.
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Perform 1-level discrete wavelet transform on the primary watermark.
Pinion Software Launches Innovative Serialized Watermark Technology
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Kennedy will retain ownership of all trademark rights relating to the Watermark Hotel and Spa and its restaurant, Pesca on the River.
Together, digital watermarks and laser perforation raise the bar against driver license counterfeiting, alteration and photo swapping, providing Utah's citizens with a much higher level of security than prior licenses and preparing the State to meet anticipated federal ID security standards.
and international patents and 24 patent applications for embedding and detecting digital watermarks in audio, image and video files.
Digital video delivered via STB with invisible, user-specific watermarks creates an environment with unique advantages to effectively secure the content.