Optical mark recognition apparatus
作者： Jurgen Erdmann , Gunter Fetzer
DOI:
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摘要: In optical mark recognition apparatus the light transmitter has two sources 11, 12 which can be selectively switched on and transmit beams of different spectral compositions. A semi-permeable mirror 15 directs 13, 14 both along a common path 16 (FIG. 1).
参考文章(7)
Norbert Karl Acker, Color code system ,(1969)
Hidekazu Sekizawa, Masana Minami, Apparatus for detecting the defects of the mask pattern using spatial filtering ,(1975)
Glenn W Robison, Raymond C Runquist, John B Christie, Color bar code tag reader with light-emitting diodes ,(1970)
Hidekazu Sekizawa, Masana Minami, Apparatus for detecting the defects of a pattern with directional characteristics using a filter having arm sections of curved shape ,(1979)
L Baker, P West, P Archer, Method of and apparatus for analysing patterns and inspecting objects ,(1973)
Genaehr Rudolf Dipl Phys, VERFAHREN UND VORRICHTUNG ZUM FORTGESETZTEN APPARATIVEN ERKENNEN VON FARBSIGNALEN ,(1973)
David L Fain, Method and apparatus for authenticating documents ,(1974)