Imaging apparatus configured for scanning a document

• US 20060268365A1
• Filed: 05/27/2005
• Published: 11/30/2006
• Est. Priority Date: 05/27/2005
• Status: Abandoned Application

• Current Assignee: Lexmark International Incorporated (Ninestar Corporation)
• Original Assignee: Lexmark International Incorporated (Ninestar Corporation)
• Inventors: Thakur, Khageshwar
• Application Number:
  US11/139,712
• Publication Number:
  US 20060268365A1
• Time in Patent Office: Days
• US Class Current: 358/474
• CPC Class Codes: H04N 1/38 Circuits or arrangements for blanking or otherwise eliminating unwanted parts of pictures H04N1/387 takes precedence

Abstract

An imaging apparatus configured for scanning a document includes a sensor for collecting image data. A phosphorescent material forming a phosphorescent area is located opposite the sensor, wherein the document is positioned between the sensor and the phosphorescent area during a scanning operation.

Claims

1. An imaging apparatus configured for scanning a document, comprising:

a sensor for collecting image data; and

a phosphorescent material forming a phosphorescent area located opposite said sensor, wherein said document is positioned between said sensor and said phosphorescent area during a scanning operation.

2. The imaging apparatus of claim 1, further comprising:

a scanner lid; and

a document pad affixed to said scanner lid, wherein said phosphorescent material forms a surface of said document pad.

3. The imaging apparatus of claim 2, further comprising a document glass having a first side for supporting said document that faces said scanner lid, and a second side, said sensor being positioned to face said second side of said document glass.

4. The imaging apparatus of claim 1, wherein said phosphorescent area is greater than a surface area of said document.

5. The imaging apparatus of claim 1, further comprising an illuminant for charging said phosphorescent material.

6. The imaging apparatus of claim 1, wherein said phosphorescent material is charged by ambient light.

7. The imaging apparatus of claim 1, further comprising a controller communicatively coupled to said sensor, said sensor providing signals to said controller relating to light emitted by said phosphorescent material at various locations on said phosphorescent area, wherein said document is sensed by said sensor as a dark image in comparison to a background formed by said phosphorescent area.

8. The imaging apparatus of claim 7, wherein dark image data associated with said dark image is interleaved with RGB image data.

9. The imaging apparatus of claim 7, further comprising said controller executing program instructions to collect data relating to a boundary of said dark image for determining a border of said document.

10. The imaging apparatus of claim 9, further comprising said controller using coordinates associated with said border of said document to de-skew image data that corresponds to said document.

11. The imaging apparatus of claim 9, further comprising an illuminant used in collecting image data relating to said document and for charging said phosphorescent material, said controller executing program instructions to turn OFF said illuminant while said light emitted by said phosphorescent material is being sensed by said sensor.

12. The imaging apparatus of claim 9, further comprising a source of ambient light to charge said phosphorescent material, wherein said ambient light is substantially blocked while said light emitted by said phosphorescent material is being sensed by said sensor.

13. The imaging apparatus of claim 9, further comprising a dedicated illuminant used for charging said phosphorescent material, said controller executing program instructions to turn said dedicated illuminant ON and OFF at prescribed times in relation to a scanning of said document.

14. The imaging apparatus of claim 1, further comprising a print engine for printing image data associated with said document.

15. The imaging apparatus of claim 1, further comprising:

an illuminant; and

a controller coupled to said sensor and said illuminant, said controller executing program instructions to collect RGB image data associated with said document, and to collect dark image data associated with said document when said illuminant is OFF, said controller using only said dark image data to determine a border of said document.

16. The imaging apparatus of claim 15, further comprising said controller using coordinates associated with said border of said document to de-skew image data that corresponds to said document.

17. The imaging apparatus of claim 1, wherein said phosphorescent material is applied non-uniformly in said phosphorescent area.

18. The imaging apparatus of claim 17, wherein said phosphorescent material is sprinkled in said phosphorescent area.

19. The imaging apparatus of claim 1, wherein said phosphorescent material is applied uniformly in said phosphorescent area.

20. The imaging apparatus of claim 1, wherein said phosphorescent material is applied in a pattern in said phosphorescent area.

21. The imaging apparatus of claim 20, wherein said pattern is a grid pattern.

22. An imaging apparatus, comprising:

a controller; and

a scanner unit coupled to said controller for scanning a document, said scanner unit including;

an illuminant;

a document glass having a first side for supporting said document to be scanned and a second side opposite said first side;

a sensor positioned to face said second side of said document glass; and

a phosphorescent material forming a phosphorescent area positioned to face said first side of said document glass.

23. The imaging apparatus of claim 22, further comprising said sensor providing signals to said controller relating to light emitted by said phosphorescent material at various locations on said phosphorescent area, wherein said document is sensed by said sensor as a dark image in comparison to a background formed by said phosphorescent area.

24. The imaging apparatus of claim 23, wherein dark image data representing said dark image is generated to be interleaved with RGB image data representing said document.

25. The imaging apparatus of claim 23, further comprising said controller executing program instructions to collect data relating to a boundary of said dark image for determining a border of said document.

26. The imaging apparatus of claim 25, further comprising said controller using coordinates associated with said border of said document to de-skew image data that corresponds to said document.

27. The imaging apparatus of claim 22, further comprising said controller executing program instructions to turn OFF said illuminant while said light emitted by said phosphorescent material is being sensed by said sensor.

28. The imaging apparatus of claim 27, wherein said phosphorescent material is charged when said illuminant is ON.

29. The imaging apparatus of claim 28, wherein said illuminant is positioned to face said second side of said document glass.

30. The imaging apparatus of claim 22, wherein said illuminant is a dedicated illuminant used only for charging said phosphorescent material.

31. The imaging apparatus of claim 22, wherein said phosphorescent material is charged by ambient light, and wherein said ambient light is substantially blocked while said light emitted by said phosphorescent material is being sensed by said sensor.

32. The imaging apparatus of claim 22, further comprising:

a scanner lid; and

a document pad affixed to said scanner lid, wherein said phosphorescent material forms a surface of said document pad.

33. The imaging apparatus of claim 32, wherein said illuminant is positioned to supply light between said scanner lid and said phosphorescent material for charging said phosphorescent material.

34. The imaging apparatus of claim 22, further comprising a print engine coupled to said controller.

35. The imaging apparatus of claim 22, said controller executing program instructions to control said illuminant and said sensor to collect RGB image data associated with said document, and to collect dark image data associated with said document, said controller using only said dark image data to determine a border of said document.

36. The imaging apparatus of claim 35, further comprising said controller using coordinates associated with said border of said document to de-skew image data that corresponds to said document.