Browse Prior Art Database

Graphic Image Processor

IP.com Disclosure Number: IPCOM000097359D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 4 page(s) / 47K

Publishing Venue

IBM

Related People

Kerl, RR: AUTHOR

Abstract

The apparatus retrieves data graphically expressed in sterographically overlapping, diapositive terrain images 1 and 2 and produces an orthographically corrected image from retrieved, processed data.

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Graphic Image Processor

The apparatus retrieves data graphically expressed in sterographically overlapping, diapositive terrain images 1 and 2 and produces an orthographically corrected image from retrieved, processed data.

Images 1 and 2 are mounted in machine bed 4. Bed 4 is movable in the Y direction by motor 19. A scan (reading) operation takes place after the advance of bed 4 by a fixed distance as indicated by shaft position encoder 10. This produces an output signal upon completion of such advance. The signal from encoder 10 causes tape adapter unit 9 to start the operation of intensity control 14 and deflection control 11. The latter cause cathode ray tube 3 to generate in time sequence a series of uniform-intensity light spots. These are transmitted over an optical system to images 1 and 2. The spots of each series so produced pass through images 1 and 2 at uniformly spaced apart distances from each other and along lines parallel to X. X is normal to the Y direction and parallel to the common nadir line of images 1 and 2. The optical system is arranged so that the spots, generated during any scan operation of tube 3, are shown on lines displaced by like distances from the nadir lines of images 1 and 2.

The light transmitted through images 1 and 2 is received at photomultiplier tubes 5 and 6, respectively. As each scan operation of tube 3 is carried out, tubes 5 and 6 produce first and second series of analog signals. The amplitudes of signals in each series represent the optical density of points in images 1 and 2 along the lines scanned. It is these series of signals (profiles) from which raw data for later processing are derived. A detailed description of the machine, cathode ray tube 3, encoder 10, and tubes 5 and 6 is found in The Rectification of Satellite Photography by Digital Techniques by R. E. Mach and T. L. Gardner, IBM Journal of Research and Development, Volume 6, page 290, 1962.

Control of the scanning apparatus as well as A/D converters 7A and 7B and tape units 8A and 8B is effected by tape adapter unit 9.

During the reading of images 1 and 2, unit 9 carries out a series of steps. In each step, unit 9 sequentially directs controls 11 and 14.

Such cause tube 3 to generate a series of uniform intensity scanning spots. At the same time, unit 9 makes converters 7A and 7B operative to digitize the analog signals produced by tubes 5 and 6. Unit 9 also is effective at this time to cause units 8A and 8B to record the various series of digitized signals on first and second tapes. The series of signals so recorded are derived from profile signals taken from images 2 and 1, respectively. The scanning operation of images 1 and 2 continues until profiles have been generated for lines extending across the the widths of images 1 and 2 and digitized signals are generated from the the profiles which, in turn, are stored on the first and second tapes.

The data on these tapes afterwards are read serially into computer 18. Her...