Foreground stabilization system for use in composite photography
US4169666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1978 |
| Grant date | Oct 2, 1979 |
| Priority date | — |
| Expiry date | Jan 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B15/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a composite photography system of the type wherein a foreground camera photographs life-size actors and objects while a background camera photographs scenery on a life-size scale or a scale different from life-size so that when the outputs from both cameras are combined the actor or foreground objects will appear to be located in the scenery filmed by the background camera, it is crucial that the motion of the background camera be slaved to the motion of the foreground camera. The foreground camera is mounted on a yaw and pitch support mechanism which is in turn mounted on a boom that provides movement along the z axis. The boom is carried by a dolly that moves the entire assembly in the x-y plane. Sensors on the dolly detect movement along the five axes of x, y, z, yaw and pitch, and cause the background camera to move its corresponding amount. These sensors, however, do not detect dolly rotation about its vertical, or z, axis which is perpendicular to the stage floor, or x-y plane, on which the dolly moves. Even a slight rotation of the dolly as it moves on the stage floor causes a misalignment of the foreground and background scenes. An inertial sensor, located on the dolly, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.