Correlation peak detector in optical spatial filtering system
Abstract
Abstract A MEANS IS DISCLOSED TO DETECT A BRIGHT SPOT CORRELATION PEAK AT ANY POSITION IN AN OUTPUT PLANE OF A DOUBLE DIFFRACTOMETER OPTICAL CORRELATOR IN WHICH AN INPUT IMAGE IS RANDOMLY LOCATED IN AN INPUT PLANE. A LENS IS POSITIONED A DISTANCE EQUAL TO ITS FOCAL LENGTH F FROM THE OUTPUT PLANE. A CENTRAL PHOTODECTOR AND A CONCENTIC OUTER PHOTODETECTOR ARE POSITIONED AT THE DISTANCE F FROMTHE LENS. THE PHOTODETECTORS ARE CONSTRUCTED SO THAT THE OUTER PHOTODETECTOR PRODUCES A LARGER ELECTRICAL OUTPUT SIGNAL WHEN BOTH PHOTODETECTORS ARE UNIFORMLY ILLUMINATED. A BRIGHT SPOT CORRELATION PEAK AT ANY LOCATION IN THE OUTPUT PLANE UNIFORMLY ILLUMINATES BOTH OF THE CONCENTRIC PHOTODETECTORS, AND A GENERAL OR DIFFUSE ILLUMINATION IN THE OUTPUT PLANE ILLUMINATES SOLELY THE CENTRAL PHOTODETECTOR. A COMPARATOR RECEPTIVE TO ELECTRICAL FROM THE PHOTODETECTORS PROVIDES A "MATCH"OUTPUT WHEN THE SIGNAL FROM THE OUTER PHOTODETECTOR IS LARGER THAN THE SIGNAL FROM THE CENTRAL PHOTODETECTOR. D R A W I N G
Inventors
- 👤 Walter Wright Lee
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