Method and apparatus for scanning images

• US 6,720,560 B1
• Filed: 10/31/2000
• Issued: 04/13/2004
• Est. Priority Date: 12/30/1999
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Edgar, Albert D., Penn, Steven C.
• Primary Examiner(s): Hannaher, Constantine
• Assistant Examiner(s): Gabor, Otilia
• Application Number:
  US09/702,388
• Time in Patent Office: 1,260 Days
• Field of Search: 250/341.8, 250/340, 250/341, 250/349, 250/339.11, 250/910, 250/330, 250/341.7, 356/239.1, 356/51, 356/237.1, 356/419, 382/275, 382/191, 382/272, 382/318, 396/309
• US Class Current: 250/341.8
• CPC Class Codes: H04N 1/00002 Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for error detection, error correction or monitoring in digital computers or digital computer components G06F11/00
• CPC Class Codes: H04N 1/00037 Detecting, i.e. determining the occurrence of a predetermined state H04N1/00031 takes precedence
• CPC Class Codes: H04N 1/0005 in service, i.e. during normal operation
• CPC Class Codes: H04N 1/00063 using at least a part of the apparatus itself, e.g. self-testing
• CPC Class Codes: H04N 1/00092 relating to the original or to the reproducing medium, e.g. imperfections or dirt detecting properties of a sheet H04N1/00681
• CPC Class Codes: H04N 1/4097 Removing errors due external factors, e.g. dust, scratches

Abstract

A method for generating a digital representation of an image by scanning the image with two different types of light. A system for use in generating a digital representation of an image, as well as digital representation of an image are also provided.

Claims

1. A method for generating a digital representation of an image, comprising:

(a) applying visible and infrared light to an image storing medium which includes the image;

(b) directing said visible and infrared light which is reflected from or transmitted through said image storing medium to a reflective surface, wherein said visible light is reflected by said reflective surface towards a first sensor and said infrared light is transmitted through said reflective surface towards a second sensor;

(c) detecting said visible light which is reflected from or transmitted through said image storing medium at said first sensor in order to provide a first image signal; and

(d) detecting said infrared light which is reflected from or transmitted through said image storing medium at said second sensor in order to provide a second image signal;

whereby said second image signal may be used to modify said first image signal to generate a modified digital representation of said image; and

wherein the optical distance between said image storing medium and said first sensor is different from the optical distance between said image storing medium and said second sensor.

2. The method of claim 1, wherein said visible and infrared light are applied to the image storing medium from the same light source.

3. The method of claim 1, wherein said visible and infrared light are applied to the image storing medium from separate light sources.

4. The method of claim 1, wherein said visible and infrared light are simultaneously applied to said image storing medium.

5. The method of claim 4, wherein said first sensor comprises a trilinear CCD array.

6. The method of claim 5, wherein said second sensor comprises one or more linear CCD arrays.

7. The method of claim 1, wherein said image storing medium comprises film, and wherein said steps of detecting visible and infrared light comprise detecting light which is transmitted through said film.

8. The method of claim 1, wherein said reflective surface comprises a cold mirror.

9. The method of claim 1, wherein the optical distance between said image storing medium and said first sensor and the optical distance between said image storing medium and said second sensor may be adjusted independently of one another.

10. The method of claim 9, wherein said first sensor is moveable to adjust the optical distance between said image storing medium and said first sensor.

11. The method of claim 9, wherein said second sensor is moveable to adjust the optical distance between said image storing medium and said second sensor.

12. A method for generating a digital representation of an image, comprising:

(a) applying visible and infrared light to an image storing medium which includes the image;

(b) directing said visible and infrared light which is reflected from or transmitted through said image storing medium to a reflective surface, wherein said visible light is transmitted through said reflective surface towards a first sensor and said infrared light is reflected by said reflective surface towards a second sensor;

(c) detecting said visible light which is reflected from or transmitted through said image storing medium at said first sensor in order to provide a first image signal; and

(d) detecting said infrared light which is reflected from or transmitted through said image storing medium at said second sensor in order to provide a second image signal; and

whereby said second image signal may be used to modify said first image signal to generate a modified digital representation of said image; and

wherein the optical distance between said image storing medium and said first sensor is different from the optical distance between said image storing medium and said second sensor.

13. The method of claim 12, wherein said visible and infrared light are applied to the image storing medium from the same light source.

14. The method of claim 12, wherein said visible and infrared light are applied to the image storing medium from separate light sources.

15. The method of claim 12, wherein said visible and infrared light are simultaneously applied to said image storing medium.

16. The method of claim 15, wherein said first sensor comprises a trilinear CCD array.

17. The method of claim 16, wherein said second sensor comprises one or more linear CCD arrays.

18. The method of claim 12, wherein said image storing medium comprises film, and wherein said steps of detecting visible and infrared light comprise detecting light which is transmitted through said film.

19. The method of claim 12 wherein said reflective surface comprises a hot mirror.

20. The method of claim 12, wherein the optical distance between said image storing medium and said first sensor and the optical distance between said image storing medium and said second sensor may be adjusted independently of one another.

21. The method of claim 20, wherein said first sensor is moveable to adjust the optical distance between said image storing medium and said first sensor.

22. The method of claim 20, wherein said second sensor is moveable to adjust the optical distance between said image storing medium and said second sensor.

23. A system for use in generating a digital representation of an image, comprising:

(a) one or more light sources operable to apply first and second types of light to an image storing medium having an image;

(b) a first sensor responsive to at least said first type of light;

(c) a second sensor responsive to at least said second type of light; and

(d) a reflective surface which reflects said first type of light and transmits said second type of light, said reflective surface positioned such that when said first and second types of light are applied to an image storing medium, said first type of light which is reflected from or transmitted through said image storing medium will be reflected towards said first sensor and said second type of light which is reflected from or transmitted through said image storing medium will be transmitted through said reflective surface towards said second sensor;

wherein the system is configured such that the optical distance between said image storing medium and said first sensor is different from the optical distance between said image storing medium and said second sensor.

24. The system of claim 23, wherein said system is configured such that said first type of light may be focused on said first sensor, and said second type of light may be focused on said second sensor.

25. The system of claim 23, wherein said system is configured such that the optical distance between said image storing medium and said first sensor and the optical distance between said image storing medium and said second sensor may be adjusted independently of one another.

26. The system of claim 23, wherein said reflective surface is chosen from the group consisting of a hot mirror and a cold mirror.

27. The system of claim 23, wherein said first type of light comprises visible light, and said second type of light comprises infrared light.

28. The system of claim 23, wherein said first type of light comprises infrared light, and said second type of light comprises visible light.

29. The system of claim 23, further comprising single light source operable to apply said first type and said second type of light to an image storing medium.

30. The system of claim 23, wherein said system comprises a scanner.

31. The system of claim 30, wherein said first type of light comprises visible light, said second type of light comprises infrared light, said first sensor comprises a trilinear CCD array and said second sensor comprises one or more linear CCD arrays.

32. The system of claim 30, wherein said first type of light comprises infrared light, said second type of light comprises visible light, said second sensor comprises a trilinear CCD array and said first sensor comprises one or more linear CCD arrays.

33. A digital representation of an image, generated by the method comprising:

(a) applying a visible and infrared light to an image storing medium which includes the image;

b) directing said visible and infrared light which is reflected from or transmitted through said image storing medium to a reflective surface, wherein one of said visible and infrared light is reflected by said reflective surface towards a first sensor and the other is transmitted through said reflective surface towards a second sensor, and further wherein the optical distance between said image storing medium and said first sensor is different from the optical distance between said image storing medium and said second sensor;

(c) detecting said visible light which is reflected from or transmitted through said image storing medium in order to provide a first image signal;

(d) detecting said infrared light which is reflected from or transmitted through said image storing medium in order to provide a second image signal; and

(e) modifying said first image signal by said second image signal in order to generate a modified digital representation of said image.

34. The digital representation of claim 33, wherein said image includes surface defects, and wherein said surface defects are substantially absent in said digital representation of the image.