Calibration method for color film inspection system
US4736245A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1987 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Jun 18, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The conventional color film inspection system does not consider calibration of an image input unit at all. It therefore cannot maintain precision at a sufficiently high level against shifts caused by gains or offset fluctuation. This invention system can prevent deterioration in inspection precision against gain drift or offset drift as it is adapted to calibrate the input unit. Further, as this invention system can obtain in advance the correspondence between images displayed in the color film inspection system with images actually printed, the original images on a negative film, if once inspected optimally, can always be printed optimally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.