Method and system for compensating the non-linearities in a reproduction process
US4075662A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Jun 8, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6033
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of calibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising the steps: generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; generating and storing a set of second signals corresponding respectively to said first signals; generating a set of third signals corresponding substantially to the gray scale values of said sample recorded gray scale; correlating said third signals to said first signals; generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; and storing said second signals in a storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.