System for calibrating a stationary image capture module of an optical scanner

1. A calibration member for use with an automatic document feed (ADF) scanner in calibrating a stationary image capture module thereof having an imaging surface against which a surface of a fed media sheet is scanned, the calibration member comprising: a body rotatably mountable about a pivot axis in the ADF scanner opposite the imaging surface, the body having an arcuate outer surface and a length substantially spanning a length of the imaging surface; a first background strip of a first thickness disposed on and extending along a first longitudinal portion of the outer surface of the body, a top surface of the first background strip having a first reflectivity; and a second background strip disposed on and extending along a second longitudinal portion of the outer surface of the body, the second background strip having a second thickness that is greater than the first thickness and having a top surface that is higher than the top surface of the first background strip, the top surface of the second background strip having a second reflectivity that is different than the first reflectivity, wherein, when the calibration member is mounted within the ADF scanner at the position opposite the imaging surface, the top surface of the second background strip wipes the imaging surface when the body is rotated about the pivot axis during positioning of the second background strip within a field of view of the image capture module during a calibration operation thereof.

2. The calibration member of claim 1 , further comprising a compliant strip positioned within and attached to the second longitudinal portion of the outer surface of the body with the second background strip being attached on top of the compliant strip.

3. The calibration member of claim 1 , wherein, when the calibration member is mounted within the ADF scanner and the body is rotated about the pivot axis to position the first background strip in the field of view of the image capture module for an image capture operation of the fed media sheet, a gap is formed between the top surface of the first background strip and the imaging surface allowing the fed media sheet to pass therebetween.

4. The calibration member of claim 1 , wherein the top surface of the second background strip comprises a substantially white area.

5. The calibration member of claim 1 , wherein the top surface of the first background strip comprises a substantially black area.

6. The calibration member of claim 1 , further comprising a transition zone longitudinally extending between the first and second background strips.

7. The calibration member of claim 1 , further comprising a third background strip extending along a third longitudinal portion of the outer surface of the body, the third background strip having a thickness that is substantially the same as the first background strip.

8. The calibration member of claim 7 , wherein a top surface of the third background strip has a reflectivity that is different from the first reflectivity of the first background strip.

9. A calibration unit for calibrating a stationary image capture module of an automatic document feed (ADF) scanner, the calibration unit comprising: a housing; a frame member positioned in the housing to extend substantially parallel to an imaging surface of the image capture module and rotatably mounted within the housing about a pivot axis, the frame member having an outer side that is rotatably moveable across and adjacent to the imaging surface upon rotating the frame member about the pivot axis; a compliant layer attached to and extending along a longitudinal portion of the outer side of the frame member; and a calibration strip extending along the longitudinal portion of the outer side of the frame and attached over the compliant layer, the calibration strip having a top surface having a first reflectivity, wherein the compliant layer and the calibration strip have a stack thickness that is greater than a closest distance between the imaging surface and the outer side of the frame member such that the top surface of the calibration strip wipes across the imaging surface when the frame member is rotated to move the calibration strip in a field of view of the image capture module during a calibration process.

10. The calibration unit of claim 9 , wherein the outer side of the frame member includes a substantially arcuate surface and the compliant layer and the top surface of the calibration strip conforms to the arcuate surface of the outer side of the frame member.

11. The calibration unit of claim 9 , wherein the top surface of the calibration strip comprises a white area.

12. The calibration unit of claim 9 , further comprising at least one image backer extending along a second longitudinal portion of the outer side of the frame member, each of the at least one image backer having a thickness that is less than the closest distance between the imaging surface and the outer side of the frame member such that a gap is defined between the imaging surface and a top surface of each of the at least one image backer to allow a media sheet to pass through the gap when the frame member is rotated to move each of the at least one image backer in the field of view of the image capture module during an image capture operation.

13. The calibration unit of claim 12 , further comprising a wiper mounted to the housing adjacent to the frame member, the wiper having a length corresponding to at least the second longitudinal portion wherein the wiper wipes the top surface of the at least one image backer when the frame member is rotated into contact with the wiper.

14. The calibration unit of claim 12 , wherein the at least one image backer comprises a first image backer and a second image backer, the top surface of the first image backer having a reflectivity that is different from a reflectivity of the top surface of the second image backer.

15. The calibration unit of claim 12 , wherein the gap has a height that is about 1 mm.

16. The calibration unit of claim 9 , wherein the stack thickness of the compliant layer and the calibration strip is greater than about 1 mm.

17. A system for calibrating a stationary image capture module of an automatic document feed (ADF) scanner, the image capture module having an imaging surface against which a surface of a fed media sheet is scanned by the image capture module, the system comprising: a housing; a rotatable frame rotatably disposed in the housing at a position opposite to the imaging surface, the frame having an outer curved surface extending through an aperture in the housing; an image backer formed on a first longitudinal portion of the outer curved surface of the frame extending substantially parallel to the imaging surface and having a top surface that does not contact the imaging surface when the frame is rotated to position the image backer in a field of view of the image capture module; a calibration surface portion formed on a second longitudinal portion of the outer curved surface of the frame and extending substantially parallel to the imaging surface, the calibration surface portion having a top surface that contacts the imaging surface when the frame is rotated to position the calibration surface portion in the field of view of the image capture module; a drive mechanism disposed within the housing and coupled to the frame for rotating the frame; and a controller in operable communication with the drive mechanism, the controller configured for controlling the drive mechanism to rotate the frame and selectively position the image backer in the field of view of the image capture module during an image capture operation, and the calibration surface portion in the field of view of the image capture module during calibration of the image capture module.

18. The system of claim 17 , wherein, during the calibration, the controller is further configured to rotate the frame to allow the image capture module to acquire a plurality of scan lines while the calibration surface portion is moving against the imaging surface.

19. The system of claim 17 , further comprising a foam layer attached to and extending along the second longitudinal portion of the frame, wherein the calibration surface portion is disposed over the foam layer.

20. The system of claim 17 , wherein the foam layer and the calibration surface portion have a stack thickness that is greater than a closest distance between an outer side of the frame and the imaging surface.

21. The system of claim 17 , further comprising a jam door connected to a housing of the ADF scanner adjacent to the imaging surface, wherein the jam door is movable between an open position and a closed position relative to the imaging surface and the frame is rotatably mounted to the jam door.

22. The system of claim 17 , further comprising a position sensor disposed adjacent the frame and in operable communication with the controller, the position sensor providing a signal representative of a position of the frame.

23. The system of claim 17 , further comprising a second image backer having a reflectivity that is less than a reflectivity of the image backer, wherein the controller is further configured to rotate the frame to position one of the image backer and the second image backer in the field of view of the image capture module based on user input.

24. The system of claim 17 , further comprising a wiper mounted to the housing adjacent to a first longitudinal edge of the aperture, the wiper having a length corresponding to at least the second longitudinal portion wherein the wiper wipes the top surface of the image backer when the frame is rotated into contact with the wiper.

25. The system of claim 24 , further comprising a second wiper mounted to the housing adjacent to a second longitudinal edge of the aperture, the second wiper having a length corresponding to at least the second longitudinal portion wherein the second wiper wipes the top surface of the image backer when the frame is rotated into contact with the second wiper.

26. The system of claim 25 , wherein the first wiper is a foam block and the second wiper is a resilient blade.

27. The system of claim 17 , wherein the top surface of the calibration surface portion comprises a white area.