Optical Matched Filtering Techniques for Automatic Interrogation of Aerial Reconnaissance Film.
GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT
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The continuing requirement for aerial reconnaissance imagery has created a need for systems to rapidly screen and interpret this film to complement the human photointerpreters handling the current work load. The Grumman developed Optical Matched Filter Image Correlation System OMFIC processes such imagery through holographic lens-matched filter optical memories at high speed conservatively estimated at 180 sq cm per second for 70 mm aerial reconnaissance film. To establish such a system, analyses of matched filter output sensitivities with variation in image parameters are made. The - 3 db sensitivities determined for the M-60 target are scale , or - 19 percent in area about 100 percent image contrast, imagery can have optical density range of 1 to 5 OD resolution, equal or greater than 5 cycles per target width and, orientation, or - 8 degrees. These sensitivities were arrived at by independently varying each parameter. Such information is utilized in the memory requirement determination for the target of interest M-60 tank. The data show the requirement for 23 filter positions of memory to cover a 360 degree target orientation. Interrelated parametric variations will require additional memory positions.
- Military Intelligence