Image processing method and apparatus for preventing coping of specified documents

• US 5,828,777 A
• Filed: 05/12/1995
• Issued: 10/27/1998
• Est. Priority Date: 02/28/1992
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Suzuki, Akio
• Primary Examiner(s): Boudreau, Leo
• Assistant Examiner(s): Kelley, Christopher S.
• Application Number:
  US08/440,318
• Time in Patent Office: 1,264 Days
• Field of Search: 355/201, 382/135, 382/137, 382/165, 382/191, 382/227, 382/309, 382/310, 358/504, 358/515, 358/518, 358/522
• US Class Current: 382/135
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation
• CPC Class Codes: H04N 1/00843 based on recognising a copy prohibited original, e.g. a banknote pattern authentication and markers therefor, forgery detection G06V20/95; character recognition G06V30/10; document-oriented image-based pattern recognition G06V30/40; testing paper currency or similar valuable papers for genuineness G07D7/00
• CPC Class Codes: H04N 1/00848 by detecting a particular original

Abstract

An image processing apparatus for performing accurate discrimination between specific originals and ordinary originals. CCD 101 inputs RGB signals, and color-space matching judgment circuit 106 and pattern matching judgment circuit 113 judge the similarity in the color distribution and pattern between the input RGB data and a predetermined specific image data. CPU 114 judges the similarity and print-signal generator 105 generates a change signal in accordance with the judged similarity. The input RGB signals are changed based on the generated change signal and outputted to external color printer 111.

Claims

1. A controlling method for generating a control signal used for controlling an image processing apparatus which processes image data representing an image in synchronism with a synchronizing signal, the method comprising the steps of:

inputting the image data in synchronism with processing performed by said image processing apparatus;

a first judging step, performed by first judging means, for judging similarity between an image represented by the input image data and a specific original image by using a first judging method;

a second judging step, performed by second judging means which is independent of said first judging means, for judging similarity between the image represented by the input image data and the same specific original image as in said first judging step by using a second judging method which is different from the first judging method;

synchronizing said first and second judging means by using the synchronizing signal to provide a common timing signal for said first and second judging means;

determining similarity between the image represented by the input image data and the specific original image based on judgment results of said first and second judging steps; and

outputting a determination result as the control signal, where the control signal controls image processing of the input image data by the image processing apparatus such that the image processing of the image processing apparatus is performed in parallel with said first and second judging steps and said determining step.

2. A controlling apparatus for generating a control signal used for controlling an image processing apparatus which processes image data representing an image in synchronism with a synchronizing signal, the apparatus comprising:

input means for inputting the image data in synchronism with processing performed by said image processing apparatus;

first judgment means for judging similarity between an image represented by the image data input by said input means and a specific original image by using a first judging method;

second judgment means for judging similarity between the image represented by the image data input by said input means and the specific original image by using a second judging method which is different from the first judging method; and

determination means for determining similarity between the image represented by the image data input by said input means and the specific original image based on judgment results by said first and second judgment means, and for outputting a determination result,

wherein the first and second judgment means are arranged independently of each other and perform judging on the same specific original image and on the same image data; and

wherein the synchronizing signal provides a common timing signal to synchronize said first and second judgment means in order to output the determination result as the control signal, where the control signal controls image processing of the input image data by the image processing apparatus such that the image processing of the image processing apparatus is performed in parallel with judging by said first and second judging means and determining by said determination means.

3. The image processing apparatus according to claim 2, wherein said first judgment means judges the similarity based on color-space information.

4. The image processing apparatus according to claim 3, wherein the color-space is R (Red)-G (Green)-B (Blue) three-dimensional color-space.

5. The image processing apparatus according to claim 2, wherein said second judgment means judges the similarity based on pattern information.

6. The image processing apparatus according to claim 5, wherein the image data represents an original image;

and

wherein said second judgment means comprises;

pattern extracting means for extracting pattern data from the original image; and

pattern comparison means for comparing the extracted pattern data with pattern data of the specific original image which has been stored in advance.

7. The image processing apparatus according to claim 6, wherein said pattern extracting means extracts pattern data at a predetermined position on the original image, and said pattern comparison means compares the pattern data at the predetermined position of the original image with pattern data for the specific original image.

8. The image processing apparatus according to claim 6, wherein said pattern comparison means outputs a signal indicating pattern similarity if at least one part of the original image is similar to a corresponding part of the specific original image.

9. The image processing apparatus according to claim 2, wherein, if both of said first and second judgment means judge that the image is similar to the specific original image, said determination means determines that the image is similar to the specific original image.

10. The image processing apparatus according to claim 2, further comprising judgment control means for, if either one of said first and second judgment means judges that the image is similar to the specific original image, performing judgment using the other judgment means based on the input image data.

11. The image processing apparatus according to claim 2, wherein said first judgment means judges similarity based on color-space information;

and

wherein said second judgment means judges the similarity based on pattern information,

said apparatus further comprising judgment control means for, if said first judgment means judges that the image is similar to the specific original image, performing judgment using said second judgment means based on the input image data.

12. An original image judgment method for generating a control signal used for controlling an image processing apparatus which processes image data representing an image in synchronism with a synchronizing signal, the method comprising the steps of:

inputting image data in synchronism with processing performed by said image processing apparatus;

extracting color-space information from the image data;

a first obtaining step for obtaining a first comparison result by comparing the extracted color-space information with color-space information of a specific original;

extracting pattern information from the image data;

a second obtaining step for obtaining a second comparison result by comparing the extracted pattern information with pattern information of the specific original; and

judging similarity between the original image and the specific original based on the first comparison result of the color-space information and the second comparison result of the pattern information,

wherein the extracted color-space information and the extracted pattern information are compared to the same specific original,

wherein the first and second comparison results are obtained from the same original image by respective first and second judgment means arranged independently of each other, and

wherein said first and second obtaining steps are performed at the same time as said step of inputting image data in order to output a judgment result from the judging step as the control signal, where the control signal controls image processing of the image data by the image processing apparatus such that the image processing of the image processing apparatus is performed in parallel with said first and second obtaining steps and said judging step.

13. The judgment method according to claim 12, wherein the color-space is RGB three-dimensional color-space.

14. The judgment method according to claim 12, wherein in the pattern information comparison step, pattern data at a predetermined position of the image is compared to pattern data at a corresponding position of the specific original image.

15. The judgment method according to claim 12, wherein in the pattern information comparison step, if one part of the original image is similar to a corresponding part of the specific original image, a comparison result indicating similarity of patterns is output.

16. The judgment method according to claim 12, further comprising performing the pattern information comparison step using the input image data in a case that the first comparison result indicates that the image is similar to the specific image.

17. A controlling method for generating a control signal used for controlling an image processing apparatus which processes image data representing an image, the method comprising the steps of:

inputting the image data in synchronism with processing performed by said image processing apparatus;

a first judging step, performed by first judging means, for judging similarity between an image represented by the input image data and a specific original image by using a first judging method;

a second judging step, performed by second judging means which is independent of said first judging means, for judging similarity between the image represented by the input image data and a specific original image by using a second judging method which is different from the first judging method;

determining similarity between the image represented by the input image data and the specific original image based on judgment results of said first and second judging steps; and

outputting a determination result as the control signal, wherein the control signal controls image processing of the input image data by the image processing apparatus such that the image processing of the image processing apparatus is performed in parallel with said first and second judging steps and said determining step.

18. A method according to claim 17, wherein said first judging method is a color matching method.

19. A method according to claim 17, wherein said second judging method is a pattern matching method.

20. A method according to claim 17, wherein said image processing apparatus is a color copy machine.

21. A method according to claim 17, wherein said control signal switches image processing performed in accordance with said image data.

22. A method according to claim 17, wherein said control signal controls whether or not to process said image data.

23. A method according to claim 17, wherein said inputting of the image data is performed by an image scanner.

24. A method according to claim 17, wherein said image processing apparatus is an apparatus forming an image in accordance with said image data by using a laser beam.

25. A method according to claim 17, wherein said image processing apparatus is an apparatus forming an image in accordance with said image data by using an ink.

26. A controlling apparatus for generating a control signal used for controlling an image processing apparatus which processes image data representing an image, the apparatus comprising:

input means for inputting the image data in synchronism with processing performed by said image processing apparatus;

first judging means for judging similarity between an image represented by the input image data and a specific original image by using a first judging method;

second judging means, which is independent of said first judging means, for judging similarity between the image represented by the input image data and a specific original image by using a second judging method which is different from the first judging method;

determination means for determining similarity between the image represented by the input image data and the specific original image based on judgment results of said first and second judging means; and

output means for outputting a determination result as the control signal, where the control signal controls image processing of the input image data by the image processing apparatus such that the image processing of the image processing apparatus is performed in parallel with said first and second judging methods and the similarity determination.

27. An apparatus according to claim 26, wherein said first judging method is a color matching method.

28. An apparatus according to claim 26, wherein said second judging method is a pattern matching method.

29. An apparatus according to claim 26, wherein said image processing apparatus is a color copy machine.

30. An apparatus according to claim 26, wherein said control signal switches image processing performed in accordance with said image data.

31. An apparatus according to claim 26, wherein said control signal controls whether or not to process said image data.

32. An apparatus according to claim 26, wherein said inputting means is an image scanner.

33. An apparatus according to claim 26, wherein said image processing apparatus is an apparatus forming an image in accordance with said image data by using a laser beam.

34. An apparatus according to claim 26, wherein said image processing apparatus is an apparatus forming an image in accordance with said image data by using an ink.