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Browse Prior Art Database

Orthophoto Scanner Printer

IP.com Disclosure Number: IPCOM000095861D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Sharp, JV: AUTHOR

Abstract

Aerial photographs contain foreshortening, surface relief and other distortions which must be removed to generate map-like orthoreproductions. If these distortion factors are known from previous calculations, the corresponding correction factors can be stored and used repeatedly to correct subsequent photographs which have the same distortion factors or ones having a known relation to the same.

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Orthophoto Scanner Printer

Aerial photographs contain foreshortening, surface relief and other distortions which must be removed to generate map-like orthoreproductions. If these distortion factors are known from previous calculations, the corresponding correction factors can be stored and used repeatedly to correct subsequent photographs which have the same distortion factors or ones having a known relation to the same.

The uncorrected film 10 is moved at a constant velocity under an optical detection head 12 while the head 12 is moved or incremented slowly transversely to the direction of the film motion to effect a raster-scan of the film. The varying analog value of the gray tones of the film scanned by the detection head 12 is applied as a Spot Intensity control signal to a CRT or other beam projection device 14. The beam deflection and Spot Size of the CRT is controlled through suitable circuitry 16 by the digital output of three magnetic tape units 18, 20 and 22 which have stored in them the predetermined X-direction, Y-direction and spot size correction information.

A blank film 24 is driven in a rectilinear fashion under the CRT device 14, while the device 14 is moved or incremented transversely, in correspondence with the motion of the detection head 12 with respect to the original film 10. The X and Y deflection of the CRT beam effect a delta-X and delta-Y relocation of the gray level information represented by the Spot Intensity analog signal, so that...