Patent · US Expired

Method and apparatus for measuring distances

US4175365A · kind A · utility

2Cited by

6References

6Claims

0Family size

Assignee

Ernst Leitz Wetzlar, GmbH · DE

Inventors

Ludwig Leitz
Knut Heitmann · Wetzlar, DE
Eckart Schneider
Horst Schmidt · Bad Endbach, DE

Key dates

Filing date	Feb 26, 1976
Grant date	Nov 27, 1979
Priority date	—
Expiry date	Feb 26, 1996

Classification

Technology area (CPC G)Physics
CPC primaryG02B27/46
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method and apparatus for the automatic evaluation of stereoscopic images by the determination of the maximum degree of correlation of identical images of an object reproduced by two objectives, for example for a range finder, wherein the two images are superimposed on one and/or two position frequency filters (82, 21, 31, 32) identical in their structures; the respective superimposed signal produced is fed respectively to one photoelectric receiver (13,14,43,44); and the output signals of the photoelectric receivers are used for indicating and/or control purposes. In one embodiment the position frequency filter (82) is moved and the output signals are correlated with each other. In another embodiment the output signals are subtracted from each other.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.