Equivalent tone region detecting device
US4470702A · kind A · utility
4Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1981 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | Nov 2, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/622
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an equivalent tone region detecting device, a position on a color picture is specified, so that video signals are provided separately according to the tricolor hues for the specified position through a scanning operation with a television camera, and similarly video signals are provided for another position through the succeeding scanning operation. The former and latter video signals are compared with one another, respectively, to determine whether or not the tone of the second position is equivalent to that of the specified position, whereby a region which is equal in tone to the specified position is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.