define fiducial markers
Coins also make good fiducial markers. 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.oins also make good fiducial markers. 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.
fiducial marks. Any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark in the form of an image is called a fiducial mark.These are usually four fiducial marks on a photograph and are used to define the principal point of the photograph.Their appearance on the image permits various calibrations, such as determination of the degree of enlargement needed to fit the picture to the rectification grids.hese are usually four fiducial marks on a photograph and are used to define the principal point of the photograph. Their appearance on the image permits various calibrations, such as determination of the degree of enlargement needed to fit the picture to the rectification grids.