Image reading apparatus with function of correcting for variation of light distribution
US8482809B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2010 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Apr 6, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A correction value determination unit determines a light quantity correction value for each main scanning position of each original based on a reading value obtained by an image reading unit reading a reference member. An anomaly detection unit detects, based on the light quantity correction value with respect to the preceding original and the light quantity correction value with respect to the succeeding original, an anomaly in the correction value, and specifies a main scanning position at which the anomaly occurs. A modification unit modifies a reading value at the main scanning position at which the anomaly occurs, out of reading values obtained from the reference member with respect to the succeeding original, or a correction value for the main scanning position at which the anomaly occurs, out of light quantity correction values with respect to the succeeding original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.