Image reading apparatus and image forming apparatus using the same
US10237449B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 2016 |
| Grant date | Mar 19, 2019 |
| Priority date | — |
| Expiry date | Aug 2, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus includes a light source, a detector, and an image processing unit that processes an image so as to determine a color and density of each pixel based on image signals detected by the detector. The image processing unit includes a determination unit that compares a target pixel and adjacent front and rear pixels and that determines a degree of matching of the target pixel to a condition for the target pixel to be a color shift pixel between the adjacent front and rear achromatic color pixels based on a pattern of the color and density. The image processing unit further includes a correction unit that variably sets a color shift correction amount based on the degree of matching, and that corrects the image signal by the color shift correction amount such that the target pixel which is the color shift pixel becomes an achromatic color pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.