Back to results
US 9,313,353 B2Granted
Scanner that detects debris
AssigneeHewlett-Packard Development Company, L.P.
InventorsDejan Depalov, Jain Chirag, Craig T. Johnson, Goudar Chanaveeragouda, Baris Efe
Life of this patent
Estimating the term…
Abstract
A scanner is disclosed. The scanner detects when the to surface of the ADF scan glass is contaminated.
Claims13
A scanner, comprising:
- a calibration strip having a bottom surface;
- an automatic document feeder (ADF) scan glass located underneath the calibration strip, the ADF scan glass having a top surface;
- a scan sensor located underneath the ADF scan glass, where the scan sensor can view the bottom surface of the calibration strip;
- an ADF to feed sheets across the ADF scan glass during a scan;
- a processor to control the scanner, the processor coupled to the ADF and the scan sensor;
- memory coupled to the processor, the memory having a debris detection module loaded therein,
- the debris detection module, when executed by the processor, causing the scanner to:
- locate a position for each long vertical streak (LVS) detected in a segment of the scan of a sheet being fed past the ADF scan glass;
- and
- compare the position of each LVS in the segment of the scan of the sheet being fed across the ADF scan glass to a scan of the calibration strip, to determine when the ADF scan glass has debris located on the top surface, wherein the scan of the calibration strip is done with no relative motion between the scan sensor and the calibration strip;
- the debris detection module to take corrective action when debris are located on the top surface.
8 more elements
A method of detecting debris on a scanner, comprising:
- comparing stationary calibration data with moving calibration data to detect when debris is located on an ADF scan glass;
- taking corrective action when debris are detected;
- wherein stationary calibration data is data from a scan of a stationary calibration strip scanned with a stationary scan sensor and moving calibration data is data from a scan of a sheet of media as the sheet of media is moved with respect to the stationary scan sensor and wherein determining when debris is located on the ADF scan glass further comprises:
- locating a position for each long vertical streak (LVS) detected in the moving calibration data, wherein the position of each LVS in the moving calibration data is compared to the stationary calibration data to detect when debris is located on the ADF scan glass.
1 more element
Dependencies are inferred from the claim text.