Image generator having automatic alignment method and apparatus
USRE33973E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1990 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Jun 21, 2010 |
Classification
- Technology area (CPC —)General
Abstract
An image recorder for providing a CRT image and apparatus to store the image on a film disposed on a film plane. The relative position, intensity and focus parameters of the image are measured during an initial startup of the image recorder, wherein the position, intensity and focus parameters of the CRT and the image thereon are automatically aligned to assure enhanced performance. The apparatus according to the present invention provides an alignment mask disposed in the CRT plane and the CRT parameters are measured by observation of the light collected through the alignment mask from the CRT and processing the corresopnding light intensity signals. The light sensing device provides a signal which is processed typically by a microprocessor controlled geometry engine to derive a set of correction data which is based on a prototype array of initialized data values. The correction data provide signals which are combined with uncorrected CRT deflection signals to provide a corrected signal. The parameters corrected by the apparatus and method according to the present invention include x and y position, focus and relative picture intensity over the surface of the screen (vignette). Th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.