Image recorder having automatic alignment method and apparatus
US4754334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Jan 8, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04793
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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 corresponding 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). T…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.