Automatic photogrammetric stereo plotter

Details Automatic photogrammetric stereo plotter Automatic photogrammetric stereo plotter

1976-11-17

1978-03-28

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 2, G01C 1112

Patent

active

040816907

ABSTRACT:
An automatic stereo plotter comprises a correlator and a follow-up unit, which is preferably employed to follow-up a measuring mark in z-direction relative to a stereo model to be evaluated. In order to improve the efficiency of the stereo plotter additional means are provided which increase the amplification factor between the parallax error signals at the output of the image correlator and the follow-up signals. Thus variations in the video signals derived from the measuring photographs are compensated for. Such means are, for example, an adjustable amplifier, which can be set to a plurality of stable amplification factors, and an analog multiplier which, due to a corresponding control voltage, permits a continuous variation of the amplification.

REFERENCES:
patent: 3145303 (1964-08-01), Hobrough

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