Image reading device and density correction method for read images
US5808756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus for book-like document includes a height detecting device which detects a height of the document, a luminance detecting device which detects a luminance of a background portion of the document image, a gloss calculating device which calculates gloss of a surface of the document in accordance with the height and the luminance, a luminance calculating device which calculates luminance corresponding to a background portion of the document image in accordance with the gloss and the height, a selecting device which selects either the detected luminance or the calculated luminance, and a density correcting means for correcting a density of the image data in accordance with said selected luminance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.