Apparatus for measurement of mechanical aberrations affecting stereoscopic image analysis

US4071772A · kind A · utility

Assignee

• Ernst Leitz GmbH

Inventors

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

Key dates

• Filing date: Oct 23, 1975
• Grant date: Jan 31, 1978
• Expiry date: Oct 23, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B7/34
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Apparatus to automatically analyze stereoscopic images comprising the determination of the maximum degree of correlation between two similar images of the same object projected by two objectives, for instance in a rangefinder, wherein the two images are superimposed on one or two spatial frequency filters identical in their structures, and wherein the particular generated superimposition signal, is preferably applied to a particular photoelectric detector and wherein the output signals from the latter are used for display and/or control purposes. The apparatus is improved by a system (20,20',21,21',22-25; 30-34) for generating a reference beam indicating mechanical changes affecting the image position of at least one of the measuring beams, at least one photoelectric detector (28,29;40) being associated with the one reference beam, the output signals from the one detector corresponding to the mechanical changes being used to display and/or correct the changes or the effects of same.