Void Pantograph: A pantograph screen that has the word 'VOID' hidden in it, created by using special screens and background designs. When photocopied by a color copier, the word 'VOID' appears on.

In, void pantograph refers to a method of making and patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out 'void', 'copy', 'invalid' or some other indicator message. Void pantographs work by exploiting the limitations and features of copying equipment.

A scanner or photocopier will act as a on the original image, blurring edges slightly. It will also not be perfectly aligned with the directions of the document, causing. Features smaller than the resolution will also not be reproduced. In addition, human vision is sensitive to.

This means that if a grey region consists of a grid of very small dark dots the filtering will produce a lighter grey, while a region of larger dots will be affected differently ('big-dot-little-dot'). This makes it possible to see a pattern that had been invisible.

Numerous variations exist, including printing the marks using a raster of lines in one direction on a background of lines in another direction, or using fine line patterns that alias into a visible when copied. References [ ].

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Aronoff, Steven J. Simske, Margaret Sturgill. Automated Optimization of Void Pantograph Settings. HP Laboratories HPL-2011-179 • J.

Lee and J Choi, 'Development of Visible Anticopy Patterns,' in TrustBus 2004, LNCS 3184, pp. 209-218 (2004) • John R.

Printing method and copy-evident secure document. US patent 5487567 • George K. New Digital Anti-Copy/Scan and Verification Technologies.

In: Optical Security and Counterfeit Deterrence Techniques V, San Jose, California; June 3, 2004; p.

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