G - Physics – 01 – C
Patent
G - Physics
01
C
33/16
G01C 11/06 (2006.01) G01C 11/10 (2006.01)
Patent
CA 1088301
ABSTRACT OF THE DISCLOSURE A device for photogrammetric evaluation of stereo- couples of photographs which are scanned light electrically and, in order to obtain height coordinate values, are evaluated by correlation. The device is particularly useful in the evaluation of aerial photographs. To reduce correlation errors due to interfering signals obtained from different correlation signal channels and, hence, to increase the precision of a correlation operation, at one time only the informations from one correlator signal channel in each of the two scanning channels are exploited to obtain the informations from the scanned stereo-pair of photographs. Therefore, it is desirable that, in the course of the correlation operation, the highly resolving correlator signal channels are predominantly and for a considerable long time employed to correlate the information. According to the invention gate circuits are inserted between the correlator signal channels and the discriminator. The signal channels are successively triggered via the gates by operation of a pulse distributor connected to a clock pulse generator in a sequence of the rising resolution of said channels.
283361
Lauenroth Gerhard
Papenkordt Lutz
George H. Riches And Associates
Veb Carl Zeiss Jena
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