Tonal conversion method for pictures
US5313310A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1990 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Feb 16, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4072
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a tonal conversion method of a picture useful upon producing a reproduced picture such as hard or soft reproduced picture from an original picture recorded or otherwise stored on a recording medium. Tonal conversion is conducted in such a way that the pictorial information value (X.sub.n) of a picture element on a camera subject; i.e., real picture corresponding to a desired picture element on the original picture, i.e., medium picture is obtained from a density information value (D.sub.n) relating to the density information of the desired picture or the original picture or the medium picture, and converting the thus-obtained pictorial information value (X.sub.n) into a tone intensity value (y) by using a specific tonal conversion formula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.