Image reading device, image forming apparatus, method of replacing a part of shading reference data, and recording medium
US10277776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2017 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Dec 6, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading device includes: a scanner having characteristics of causing a distorted sine wave being formed by its obtained image data and being represented as an array of shade values arranged in a main scanning direction; a reference member to be scanned; a hardware processor that: obtains a shade value at each main scanning coordinate from shading reference data obtained from the reference member; detects the start and end position of a distorted waveform range in the shading reference data; defines the start and end position of a target range as the main scanning coordinates of two peaks, the two peaks being in a distorted sine wave formed by the shading reference data, the two peaks being within a predetermined reference distance to the right and left of the start and end position; and replaces a part of data in the target range with a substitute part of data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.