Image processing apparatus and method for detecting change in image

• US 6,421,452 B1
• Filed: 07/29/1999
• Issued: 07/16/2002
• Est. Priority Date: 08/07/1998
• Status: Expired due to Term

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Ishida, Yoshihiro, Oya, Takashi, Matsuura, Tomohiko
• Primary Examiner(s): Johns, Andrew W.
• Assistant Examiner(s): NAKHJAVAN, SHERVIN K
• Application Number:
  US09/363,105
• Time in Patent Office: 1,083 Days
• Field of Search: 382/100, 382/107, 382/312, 382/319, 396/3, 396/4, 396/63, 396/64, 396/65, 396/79, 396/80, 396/81, 396/82, 396/104, 396/153, 396/154, 396/169, 396/213, 396/235, 396/246, 396/247, 73/14.1, 73/14.2, 73/15.6, 352/39, 352/46, 352/48, 352/140, 352/141, 352/205, 352/206, 348/152, 348/155, 348/169
• US Class Current: 382/107
• CPC Class Codes: G06T 7/254 involving subtraction of images
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19604 involving reference image or background adaptation with time to compensate for changing conditions, e.g. reference image update on detection of light level change
• CPC Class Codes: G08B 13/19663 Surveillance related processing done local to the camera

Abstract

An image processing apparatus or an image processing method is arranged to input image data obtained by an image pickup device and an image pickup parameter of the image pickup device used in obtaining the image data, to make a comparison between the image pickup parameter for a target image and the image pickup parameter for another image, and to decide whether or not the target image differs from the other image, according to a result of the comparison.

Claims

1. An image processing apparatus comprising:

a) input means for inputting image data obtained by image pickup means and an image pickup parameter of said image pickup means used in obtaining the image data;

b) comparison means for making a comparison between the image pickup parameter for a target image and the image pickup parameter for another image; and

c) decision means for deciding whether or not said target image differs from said another image, according to an output of said comparison means.

2. An apparatus according to claim 1, wherein the image pickup parameter is exposure information.

3. An apparatus according to claim 2, wherein the exposure information is information related to one of a shutter speed, an iris aperture and a gain or information related to a combination of the shutter speed, the iris aperture and the gain.

4. An apparatus according to claim 1, wherein the image pickup parameter is focusing-distance information.

5. An apparatus according to claim 1, wherein said decision means decides whether or not a moving body exists in said target image.

6. An apparatus according to claim 4, wherein said decision means decides that a moving body exists in said target image, when said target image differs from said another image in the focusing-distance information.

7. An apparatus according to claim 1, further comprising output means for externally outputting the image data according to an output of said decision means.

8. An apparatus according to claim 7, wherein said output means outputs the image data after subjecting the image data to compression encoding.

9. An apparatus according to claim 8, wherein the compression encoding is an encoding process of JPEG system.

10. An apparatus according to claim 8, wherein the compression encoding is an encoding process of MPEG system.

11. An apparatus according to claim 1, wherein said input means includes said image pickup means.

12. An apparatus according to claim 1, further comprising parameter storing means for storing the image pickup parameter inputted by said input means.

13. An apparatus according to claim 12, wherein the image pickup parameter stored by said parameter storing means is updated according to a result of the decision made by said decision means.

14. An apparatus according to claim 1, further comprising image data storing means for storing the image data inputted by said input means.

15. An apparatus according to claim 14, wherein the image data stored by said image data storing means is updated according to a result of the decision made by said decision means.

16. An apparatus according to claim 15, further comprising detection means for detecting a moving body on the basis of the image data inputted by said input means and the image data stored by said image data storing means.

17. An apparatus according to claim 1, wherein said comparison means makes a comparison between the image pickup parameters in a desired area within an image plane.

18. An image processing apparatus comprising:

a) measuring means for measuring an optical parameter;

b) image pickup means for generating image data by controlling an optical system according to an output of said measuring means;

c) parameter storing means for storing the optical parameter measured by said measuring means;

d) comparison means for making a comparison between the optical parameter measured by said measuring means and the optical parameter stored by said parameter storing means; and

e) decision means for deciding whether the image data has changed or not, according to a result of the comparison made by said comparison means.

19. An apparatus according to claim 18, wherein said measuring means includes setting means for setting a measuring area for which the optical parameter is to be measured.

20. An apparatus according to claim 18, wherein the optical parameter includes exposure information.

21. An apparatus according to claim 20, wherein the exposure information is information related to one of a shutter speed, an iris aperture and a gain or information related to a combination of the shutter speed, the iris aperture and the gain.

22. An apparatus according to claim 18, wherein the optical parameter includes focusing-distance information.

23. An apparatus according to claim 18, wherein, when the image data is decided by said decision means to have changed, the optical parameter stored by said parameter storing means is updated.

24. An apparatus according to claim 18, further comprising image data storing means for storing the image data.

25. An apparatus according to claim 24, wherein, when the image data is decided by said decision means to have changed, the image data stored by said image data storing means is updated.

26. An apparatus according to claim 25, further comprising detection means for detecting a moving body on the basis of the image data generated by said image pickup means and the image data stored by said image data storing means.

27. An apparatus according to claim 18, further comprising notifying means for, when the image data is decided by said decision means to have changed, externally giving a notice of a result of the decision.

28. An image processing method comprising the steps of:

inputting image data obtained by image pickup means and an image pickup parameter of said image pickup means used in obtaining the image data;

making a comparison between the image pickup parameter for a target image and the image pickup parameter for another image; and

deciding whether or not said target image differs from said another image, according to a result of the comparison.

29. An image processing method comprising the steps of:

measuring an optical parameter;

generating image data by controlling an optical system according to a result of the measurement;

storing the optical parameter measured by said measuring step in a storage medium;

making a comparison between the optical parameter measured by said measuring step and the optical parameter stored in said storage medium; and

deciding whether the image data has changed or not, according to a result of the comparison.