Device for photogrammetric evaluation of stereo-couples of photographs
First Claim
1. A device for photogrammetric evaluation of stereo-couples of serial photographs, comprisinga stereo-couple of two photographs,displacement means for displacing at least one of said two photographs,a first and a second cathode ray tube,a first and a second photo-detectorsaid first cathode ray tube emitting a first light beam, said first photodetecting being for detecting said first light beam,one of said photographs being arranged in said first light beam,said second cathode ray tube being for emitting and said second photodetector being for detecting a second light beam,the other of said photographs being arrranged in said second light beam,a first group of four correlator signal channels,a second group of four correlator signal channels,said first group being electrically connected to the output of said first photodetector,said second group being connected to the output of said second photodetector,the individual correlator signal channels in said first and said second group having different frequency ranges and different delay times,the individual signal channels from said first group and the individual channels from said second group are connected in pairs,said pairs having identical frequency ranges and delay times,eight gate circuits,said gate circuits having first inputs,second inputs and an output each,said first inputs being connected to said individual signal channels,said second inputs connecting those gate circuits being in turn connected via said first inputs to said pairs of signal channels, thus forming pairs of gate circuits,a pulse switch having one input and four outputs,a clock-pulse generator being connected to said one input,said four outputs being respectively connected to said four pairs of gate circuits,a discriminator having two inputs and one output,the two discriminator inputs being connected via said four pairs of gate circuits and via said first group and said second group of signal channels to said first and second photodetector, respectively,a displacement meansthe discriminator output being connected to said displacement means,said displacement means being provided with means for displacing at least one of said two photographs.
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Abstract
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 correlator 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 desireable 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 informations. 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 distributer connected to a clock pulse generator in a sequence of the rising resolution of said channels.
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Citations
1 Claim
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1. A device for photogrammetric evaluation of stereo-couples of serial photographs, comprising
a stereo-couple of two photographs, displacement means for displacing at least one of said two photographs, a first and a second cathode ray tube, a first and a second photo-detector said first cathode ray tube emitting a first light beam, said first photodetecting being for detecting said first light beam, one of said photographs being arranged in said first light beam, said second cathode ray tube being for emitting and said second photodetector being for detecting a second light beam, the other of said photographs being arrranged in said second light beam, a first group of four correlator signal channels, a second group of four correlator signal channels, said first group being electrically connected to the output of said first photodetector, said second group being connected to the output of said second photodetector, the individual correlator signal channels in said first and said second group having different frequency ranges and different delay times, the individual signal channels from said first group and the individual channels from said second group are connected in pairs, said pairs having identical frequency ranges and delay times, eight gate circuits, said gate circuits having first inputs, second inputs and an output each, said first inputs being connected to said individual signal channels, said second inputs connecting those gate circuits being in turn connected via said first inputs to said pairs of signal channels, thus forming pairs of gate circuits, a pulse switch having one input and four outputs, a clock-pulse generator being connected to said one input, said four outputs being respectively connected to said four pairs of gate circuits, a discriminator having two inputs and one output, the two discriminator inputs being connected via said four pairs of gate circuits and via said first group and said second group of signal channels to said first and second photodetector, respectively, a displacement means the discriminator output being connected to said displacement means, said displacement means being provided with means for displacing at least one of said two photographs.
Specification
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- Resources
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Current AssigneeJenoptik JENA GmbH (Jenoptik AG)
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Original AssigneeJenoptik JENA GmbH (Jenoptik AG)
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InventorsLauenroth, Gerhard, Papenkordt, Lutz
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Primary Examiner(s)Nelms, David C.
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Application NumberUS05/797,658Time in Patent Office529 DaysField of Search356/2, 356/203, 356/205, 250/558, 250/208, 250/209US Class Current250/558CPC Class CodesG01C 11/10 using computers to control ...
