Apparatus for reading image from original image on translucent film with automatic adjustment of the quantity of light from a light source
US5414535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1992 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | May 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus includes a projector for projecting light through a translucent film so as to produce a projected image from an original image on the film, a correction part for adjusting a quantity of the light, an image sensor for reading out an image from the projected image and outputting an analog signal indicating the read-out image, a signal conversion part for converting the analog signal into a digital signal indicating the read-out image, and a control part for measuring a peak value of digital signals supplied by the signal conversion part with respect to an effective range of the original image, and for allowing the correction part to adjust appropriately the quantity of the projected light in response to the measured peak value of the digital signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.