Tonal conversion method of pictures for producing reproduced pictures free of color-fog
US5057931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Feb 16, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tonal conversion method of pictures useful upon producing reproduced pictures such as halftone pictures free of color-fog from color-fogged color original pictures of continuous tone. The tonal conversion is conducted in a manner that objective data relating to color-fog from a color original picture having color-fog thereon are obtained using undistorted X-axis pictorial information values for respective C, M and Y color plates obtained from the corresponding density values on the D axis in accordance with corresponding density characteristic curves of R, G, B photosensitive emulsion layers of a color film used upon photographing the original color pictures, thereby providing reproduced pictures free of color-fog by using a specific tonal conversion formula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.