Optical scanning device having a calibrated pixel output and method for calibrating such a device
June 16, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2935619 Optical reading system Optical information reading device Optical path monitoring circuit for a document scanner 4920428 Mark sense detector with variable threshold Shading correcting method in image reading device Illumination type optical recorded information reading device Circuit for adjusting sensitivity of optical character reader and method thereof Method and apparatus for calibrating a bar code scanner InventorsAssigneeApplicationNo. 596274 filed on 06/16/2000US Classes:358/509, Illumination358/475, Facsimile illumination control358/486, Scan rate or document movement variation in accordance with data presence358/496, Document moves during scanning358/504Measuring, testing, and calibratingExaminersPrimary: Lee, CheukfanAttorney, Agent or FirmInternational ClassH04N 001/46AbstractAn optical reading head system has a calibrated pixel output, consisting of a discrete value for each of a plurality of pixels. The system has a scanning station with an exposure region that includes an image region and a detector including an array of photosensitive sites that sense reflected light from the exposure region during a detector exposure period to generate a pixel output profile of the image region. There are a plurality of light sources for lighting the exposure region. Each light source emits an individually controllable amount of light to the exposure region during a detector exposure period such that the system's pixel output is acceptably calibrated. A calibration medium is supplied with a calibration region, and a target pixel output profile is defined for the calibration. The individually controllable light sources are adjusted to make the pixel output profile acceptably within range of the target pixel output profile.Other References
Field of SearchIlluminationFacsimile illumination control Document moves during scanning Document position detection Facsimile control unit Facsimile measuring, testing, or calibrating Measuring, testing, and calibrating Scan rate or document movement variation in accordance with data presence Scanning HISTOGRAM PROCESSING | |
