Fiducial

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• In statistics, fiducial inference is a form of interval estimation developed by R.A. Fisher in connection with the Behrens-Fisher problem.

• In physics, 3D computer graphics and photography, "fiducials" or "fiduciary markers" are reference points: fixed points or lines within a scene to which other objects can be related or against which objects can be measured. Cameras outfitted with reseau plates produce these reference marks (also called reseau crosses) and are commonly used by NASA.[1]

• In applications of augmented reality or virtual reality, "'fiducials'" are often manually applied to objects in the scenery to recognize these objects in images of the scenery. For example, to track some object, a light emitting diode can be applied to it. With the knowledge of the color of the emitted light, the object can easily be identified in the picture.

• In printed circuit board (PCB) design, "fiducial" marks, also known as circuit pattern recognition marks, allow automated assembly equipment to accurately locate and place parts on boards. These equipment locate the circuit pattern by providing common measurable points. They are usually made by leaving a spot of the board bare with a bare copper-, nickel-, or solder-coated dot inside.

• In color printing "fiducials" are used at the edge of the cyan, magenta, yellow and black (CMYK) printing plates so that they can be correctly aligned with each other.

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

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• This page was last modified 20:57, 4 March 2007 by Anonymous user(s) of Wikipedia. Based on work by Wikipedia user(s) Michael Hardy, Leon7, Jaredroberts, TedE, Commander Keane bot, Lectonar, Dcoetzee, DMG413 and LeeHunter.
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