Film image reading system and image processing method
US5740312A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus achieves an exposure control for getting an image with the best SN without a mechanical iris and an image processing which is good at the color-reappearance and the gradation property with a simple digital processing circuit. When the film image is read by the line sensor 14 which has an electric shutter function, the electric shutter, the film feeding speed and the analog amplifier 16 are controlled totally so as to obtain images with the best SN from high to low transmittance negatives. And, when the dot sequential R, G, B digital signals are processed digitally, the offset values and the gain volumes of the respective R, G, B are calculated based on the maximum value and the minimum value which are detected by the respective R, G, B digital signals, the calculated offset values of the respective R, G, B are added to the dot sequential R, G, B digital signals which are obtained during the re-scanning, and the calculated gain volumes of the respective R, G, B are multiplied by the offset dot-sequential R, G, B digital signals so as to adjust the white balance and the black balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.