page_title: Fiducial marker
section_title: Applications
hierarchical_section_title: Fiducial marker / Applications
caption_attribution_description: English: NASA photo AS14-68-9487
context_page_description: A fiducial marker or fiducial is an object placed in the field of view of an imaging system which appears in the image produced, for use as a point of reference or a measure. It may be either something placed into or on the imaging subject, or a mark or set of marks in the reticle of an optical instrument.
caption: On NASA photographs, crosshair reticles on a Réseau plate enable distortions due to processing and handling to be detected and corrected.
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