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A fiduciary marker or fiducial is an object used in the field of view of an imaging system which appears in the image produced.

Markers may be used to make otherwise invisible or difficult to distinguish features of an image more visible. Markers can simplify computerized image processing applications such as motion capture, by providing an easy-to-track feature in images which follows the movements of the marked subject.

See reactivision, which implements fiducial tracking. Also other implementations such as Microsoft's Surface references fidicuals as "tags" or patterns.