Apparatus and method for adjusting video display
US5475447A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1993 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Dec 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/31
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and a method for adjusting a video display, device with no need to determine precisely the positional relationship between an image producing element and the video display area of a projector or monitor while the latter device is being adjusted for video display by detecting beam positions. The entire video display area is detected by a image input. Camera and the video display area information thus obtained is represented by the coordinates, in a memory, of four points enclosing the area. The memory coordinates of the first points to be obtained based on a reference image are calculated from the coordinates of these four points. The coordinates of the first points are compared with those of the second points determined with respect to the reference image. The result is used to operate a system controller for adjustment and control of the video display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.