1
Ludwig Leitz, Knut Heitmann: System for measuring position and/or velocity. Ernst Leitz Wetzlar, Gilbert L Wells, April 1, 1980: US04195425 (25 worldwide citation)

System for measuring the relative position and/or velocity of two objects with respect to each other and/or with respect to a common reference system, such as the ground, according to the magnitude and direction thereof, using electro-optical measuring means, the improvement comprising:


2
Ludwig Leitz, Knut Heitmann, Eckart Schneider: System for monitoring spaces by electro-optical means. Gilbert L Wells, July 27, 1976: US03972021 (25 worldwide citation)

System for monitoring spaces by electro-optical means, using optical imaging means (1) capable of detecting objects present in the monitored spaces and beam splitting means (2) for grating resolution of the object images into geometric, mutually complementary components. The imaging and beam splitti ...


3
Ludwig Leitz: Optical correlator. Ernst Leitz Wetzlar, Gilbert L Wells, November 28, 1978: US04127778 (22 worldwide citation)

The invention relates to an optical correlator comprising an optical system for imaging an object space, a spatial frequency filter disposed in or close by the image plane, and at least one photoelectric detector assigned to said spatial frequency filter. According to the invention the spatial frequ ...


4
Ludwig Leitz, Knut Heitmann, Eckart Schneider, Klaus Dieter Schaefer: Method and apparatus for photoelectrically determining the position of at least one image focus plane. Ernst Leitz, Gilbert L Wells, January 31, 1978: US04071297 (18 worldwide citation)

A system for determining photoelectrically the position of at least one focus plane of an image within an optical apparatus, wherein the object is reproduced at least at one spatial frequency filter of an optical image correlator and there is measurement and/or display of the light fluxes leaving th ...


5
Ludwig Leitz, Walter Mandler: Still pocket camera. Ernst Leitz G m b H, Gilbert L Wells, July 19, 1977: US04037238 (10 worldwide citation)

An improved photographic still pocket camera, where the film is inserted in a cassette provided with a feed part or spool and a take-up part or spool, these parts or spools connected by a film guide ledge. A zoom lens is mounted inside the camera, with the picture-taking beam path of the zoom lens l ...


6
Ludwig Leitz: Method for combining individual road-transport with rail-bound train-transport, and apparatus for implementing the method. Wells & White, October 23, 1990: US04964767 (10 worldwide citation)

Individual road transport and rail-bound transport are combined with rapid transfer from one transport mode to the other. The transport units for individual traffic are semi-trailer trucks. The load and transported-material bearing semi-trailer are transferred by cross-rolling onto the low-platform ...


7
Ludwig Leitz, Knut Heitman: System for achieving a maximum braking effect. Ernst Leitz G m b H, Gilbert L Wells, June 1, 1976: US03960410 (8 worldwide citation)

The maximum braking or powering effect due to changing road conditions, preferably for the case of full braking of a rubber-tired vehicle is determined in the system of the present invention during normal driving conditions. In this system measurement apparatus known per se are used wherein


8
Ludwig Leitz: Method and apparatus for photoelectrically determining the position of at least one focal plane of an image. Ernst Leitz Wetzlar, Gilbert L Wells, August 29, 1978: US04110042 (8 worldwide citation)

Method and apparatus for measuring distance using an optical correlator system containing at least one imaging optic, at least one optically active array, and at least a system of photoelectric detectors associated with the array preferably in the form of an optical grating structure wherein for the ...


9
Ludwig Leitz, Werner Holle, Knut Heitmann: Apparatus for determining the relative position of the plane of maximum amplitude of the local frequency component. Ernst Leitz G m b H, Gilbert L Wells, April 27, 1976: US03953728 (6 worldwide citation)

In an apparatus, an imaging system, at least one optically effective grating and a photoelectric receiver system are employed for determining the relative position of the plane of maximum amplitude of a spatial frequency component in the image of an object. The imaging system produces from light flu ...


10
Ludwig Leitz, Knut Heitmann, Horst Schmidt: Apparatus for measurement of mechanical aberrations affecting stereoscopic image analysis. Ernst Leitz, Gilbert L Wells, January 31, 1978: US04071772 (4 worldwide citation)

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 f ...