Abstract: A stereoscopic film projection system including one or more electro-optical light modulators used as part of, or in conjunction with, stereoscopic projection optics for the above-and-below film format employed for 35 mm theatrical cinema. The optical state of each modulator is voltage dependent, and the driving voltage therefor is generated in response to signals from a sensor positioned in the projector aperture. The sensor detects the presence or absence of index marks on the film. This arrangement insures that each subframe is maintained in a proper relationship with the optics' polarizers for preventing the projection of pseudostereoscopic motion pictures.

Abstract: An electronic stereoscopic video camera for capture and playback of still or moving images. The camera of the invention employs a signal processing means to process the video output of left and right image sensors in order to locate the positions of left and right images in the camera's left and right image fields, respectively. As a result of comparison of the left and right image locations, control signals are generated for adjusting the effective position of one or both of the sensors in relation to a set of fixedly mounted camera lenses. The invention permits rapid and accurate control of a variety of video camera parameters by employing a self-correcting closed loop servo means in which the unmodified output of the left and right image sensors of a camera serves as feedback for generating control signals.

Abstract: A stereoscopic television system comprising single or double camera designs adapted to televise twin perspective points of view, which are the source for encoding alternate odd and even fields with right and left images, and a television receiver for displaying such images with either passive or infra-red signaled or internally clock controlled active selection devices. The receiver and the preferred embodiment of the camera use field storage devices to record and playback picture information in an appropriate sequence in such a manner to eliminate flicker and to overcome spurious temporal parallax effects. The receiver uses monochromatic or color television tubes, like those of present manufacture, but employs means to double the scan rate so that, for example, an effective 60 fields for each eye for domestic receivers, and 50 fields for each eye, for certain foreign receivers, is achieved. Field storage or buffer circuits allow the doubling of the number of fields without doubling of the bandwidth.

Abstract: Paired movie cameras, each having synchronized movements and in phase shutters, are provided with focus and zoom optics of identical, but conventional and commercial manufacture. The paired lenses are first rotated relative to one another to obtain a coincidence between the centration vector for each lens for either zoom or focus. Once the centration vectors are aligned identically on a polar basis, mounting to the camera with provision for synchronous zoom between the respective cameras thereafter occurs. Typically, and before each stereo shooting, the zoom optics are set to a maximum magnification and registered to the appropriate distance with the lens finders and reticules. Upon change of the focus and/or zoom setting, a variable prism affixed to one camera is moved relative to the remaining camera to maintain identical centration between the respective lens cameras.