Imaging apparatus and method

• US 7,327,496 B2
• Filed: 04/11/2003
• Issued: 02/05/2008
• Est. Priority Date: 04/11/2003
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Larson, Bradley R.
• Primary Examiner(s): LEE, TOMMY D
• Application Number:
  US10/412,108
• Publication Number:
  US 20040201868A1
• Time in Patent Office: 1,761 Days
• Field of Search: 358/3.26, 358/471, 358/474, 358/463, 358/464, 382/275
• US Class Current: 358/3.26
• CPC Class Codes: H04N 1/4095 Correction of errors due to scanning a two-sided document, i.e. show-through correction

Abstract

An imaging apparatus includes a first sensor for imaging a first side of an object and a second sensor for imaging a second side of an object. The imaging apparatus also includes an information handling system for generating a negative image of the second side, and a background generator for displaying the negative image of the second side. A method for imaging includes imaging a second side of an object; and producing a negative of an image on the second side; and summing the negative of the image on the second side with the image of the second side.

Claims

1. A method for imaging comprising:

imaging a first side of the object;

imaging a second side of an object; and

producing a negative of an image on the second side; and

summing the negative of the image on the second side with the image of the second side; and

shifting a contrast on a image of the first side in response to an amount of correction applied by summing the produced negative of the second side with the image on the second side.

2. The method for imaging of claim 1 wherein producing a negative of the image on the second side includes producing a negative that is less dark than the image on the second side.

3. The method for imaging of claim 1 wherein producing a negative of the image on the second side includes:

locating the negative of the image of the second side on the first side; and

determining darkness levels of the negative of the image on the second side on the first side.

4. The method for imaging of claim 1 wherein summing further comprises matching the produced negative of the image to the image on the second side.

5. The method for imaging of claim 4 wherein matching the negative of the image on the second side to the produced negative image includes:

rotating the produced negative of the image; and

translating the produced negative of the image.

6. The method for imaging of claim 1 wherein imaging the second side of the object is performed at a lower resolution than the imaging of the first side on the page.

7. The method for imaging of claim 1 further comprising shifting the white point on the image of the first side in response to an amount of correction applied by summing the produced negative of the second side with the image on the second side.

8. The method for imaging of claim 1 and wherein imaging the first side of the object follows imaging the second side of an object.

9. The method for imaging of claim 8 wherein imaging the first side of an object and imaging the second side of an object includes imaging the first side and the second side of a document.

10. The method for imaging of claim 8 wherein imaging the first side of an object and imaging the second side of an object includes scanning the first side of the object and the second side of the object.

11. A method for imaging comprising:

imaging a second side of an object;

producing a negative of an image on the second side;

summing the negative of the image on the second side with the image of the second side;

locating the negative of the image of the second side on the first side;

determining darkness levels of the negative of the image on the second side on the first side; and

producing a negative substantially as dark as the darkest of the darkness levels associated with the negative of the image on the second side on the first side.

12. The method for imaging of claim 11 wherein producing a negative of the image on the second side further includes producing a negative having varying levels of darkness, wherein the darkest portion of the negative of the image on the second side is substantially as dark as the darkest of the darkness levels associated with the negative of the image on the second side on the first side.

13. A method for imaging comprising:

imaging a first side of the object;

imaging a second side of an object; and

producing a negative of an image on the second side; and

summing the negative of the image on the second side with the image of the second side; and

shifting the white point on the image of the first side in response to the amount of correction applied by summing the produced negative of the image on the second with the image and the image on the second side.

14. A computer readable medium having instructions for causing an information handling system to perform a method, the method comprising:

imaging a second side of an object; and

producing a negative of an image on the second side; and

summing the negative of the image on the second side with the image on the second side,

wherein producing a negative of the scan of an image on the second side further includes producing a negative image substantially as dark as the darkest of the plurality of darkness levels associated with the negative image of the second side.

15. The computer readable medium of claim 14 if wherein producing a negative of an image on the second side further includes:

locating the image of the second side; and

determining a plurality of darkness levels of the negative image of the second side on a first side of the object.

16. The computer readable medium of claim 14 further comprising imaging a first side of an object as the negative of the second side is summed with the image on the second side.

17. A computer readable medium having instructions for causing an information handling system to perform a method, the method comprising:

imaging a second side of an object; and

producing a negative of an image on the second side; and

summing the negative of the image on the second side with the image on the second side,

wherein producing a negative image on the second side further includes producing a negative having varying levels of darkness, wherein the darkest portion of the negative image on the second side is substantially as dark as the darkest of the darkness levels associated with the negative image of the second side on the first side.

18. An imaging apparatus comprising:

a first sensor for imaging a first side of an object;

a second sensor for imaging a second side of an object;

an information handling system for generating a negative image of the second side; and

a background generator for displaying the negative image of the second side, wherein the sensor for imaging the first side of the object compensates for a shift in a white point value.

19. The imaging apparatus of claim 18 wherein the information handling system sums the negative of the image of the second side with the image of the second side during the scan of the first side.

20. The imaging apparatus of claim 19 wherein the sensor for imaging the first side of the object adjusts a contrast value based on the scan of the first side of the object as the negative of the image presented of the second side of the object is summed with the image on the second side of the object.

21. The imaging apparatus of claim 20 wherein the maximum capable resolution of the second scan sensor is lower than the maximum capable resolution of the first scan sensor.

22. The imaging apparatus of claim 20 wherein one of the first scan sensor and the second scan sensor is a monochrome scan sensor.

23. The imaging apparatus of claim 19 wherein the sensor for imaging the first side of the object compensates for a shift in a contrast value.

24. The imaging apparatus of claim 18 wherein the first sensor and the second sensor are scan sensors.

25. The imaging apparatus of claim 18 wherein for the background generator produce a negative image of the second side.

26. The imaging apparatus of claim 25 further comprising a first in, first out memory for storing a negative image of the second side.

27. An imaging apparatus for imaging an object comprising:

a sensor for imaging the second side of an object;

means for producing a negative image of the second side;

means for summing the negative of the image of the second side with the image of the second side;

a memory for storing the negative image; and

a background generator, wherein the background generator projects the negative of the image on the second side onto the second side of the object.

28. The imaging apparatus of claim 27 wherein the means for summing the negative image of the second side with the image of the second side includes a memory for storing the negative image.

29. The imaging apparatus of claim 27 further comprising a sensor for imaging a first side of an object.

30. The imaging apparatus of claim 27 wherein the means for summing the negative image of the second side with the image of the second side includes a microprocessor.

31. The imaging apparatus of claim 27 further comprising a sensor for imaging a first side of an object,

wherein the background generator adds the negative of the second image to the second image so produce a substantially uniform background as the first sensor images the first side of the object.