1 July 1970 An Inexpensive Automatic Digital Film Reader
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An inexpensive digital film reader has been developed which can automatically record x and y coordinates of manually located points within a 2.5 cm x 2.5 cm area to within 20μ. The reader consists of a projection microscope with an instrumented movable stage. Positions of images on films clamped to the stage are determined by moving the stage until the target image point falls under a cross hair on the projection screen. Coordinates of the stage position are sensed with a digital voltmeter. The voltmeter drives a keypunch which records film position data in a form compatible with computer processing.
Diamantis D. Preonas, Diamantis D. Preonas, Hallock F. Swift, Hallock F. Swift, G. S. Williams, G. S. Williams, } "An Inexpensive Automatic Digital Film Reader," Optical Engineering 8(5), 805184 (1 July 1970). https://doi.org/10.1117/12.7971534 . Submission:

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