Motion detection in an image capturing device

• US 7,271,830 B2
• Filed: 02/11/2002
• Issued: 09/18/2007
• Est. Priority Date: 02/11/2002
• 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: Bean, Heather N., Robins, Mark N.
• Primary Examiner(s): Ometz; David
• Assistant Examiner(s): NGUYEN, LUONG TRUNG
• Application Number:
  US10/073,623
• Publication Number:
  US 20030151672A1
• Time in Patent Office: 2,045 Days
• Field of Search: 348/208.99, 348/208.6, 348/208.4, 348/208.12, 348/208.13, 348/208.14
• US Class Current: 348/208.6
• CPC Class Codes: G08B 13/19663 Surveillance related processing done local to the camera
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal

Abstract

An image capturing device includes an electronic image sensor, a memory, and a processor. The memory includes a motion detect routine, a predetermined image interval, and at least one predetermined motion threshold. The processor conducts the capturing of images separated by the predetermined image interval, compares a current image to one or more previous images, determines when motion between the current image and the previous image is below the at least one predetermined motion threshold, and stores the current image as a final image when the current image is stable.

Claims

1. An image capturing device, comprising:

an electronic image sensor;

a memory including a motion detect routine, a predetermined image interval, and at least one predetermined motion threshold; and

a processor communicating with said electronic image sensor, a shutter button, and said memory, said processor being configured to;

(a) compare a second image to a first image, wherein the second image is captured after the first image is captured, to determine if motion between said second image and said first image is below said at least one predetermined motion threshold, (b) store said second image as a final image if the motion between said second image and said first image is below said at least one predetermined motion threshold, and (c) capture a third image and compare the third image with the second image to determine if motion between said third image and said second image is below said at least one predetermined motion threshold if the motion between said second image and said first image is not below said predetermined motion threshold.

2. The image capturing device of claim 1, said memory further including a predetermined sampling pattern of pixels to be sampled in a captured image and wherein a comparison is performed on pixels included in said predetermined sampling pattern.

3. The image capturing device of claim 1, wherein the processor is configured to compare a main object of the second image with a main object of the first image to determine if motion between said second image and said first image is below said at least one predetermined motion threshold.

4. The image capturing device of claim 1, said memory further including a number of regions data dividing a captured image into a plurality of image regions and wherein a region-by-region comparison is performed between two successive images.

5. The image capturing device of claim 1, said memory further including a motion detect variable, wherein a motion detection is performed when said motion detect variable is set to an enable state.

6. The image capturing device of claim 1, wherein said predetermined motion threshold is user-settable.

7. The image capturing device of claim 1, wherein said processor is further configured to set a hold out timer to expire in a predetermined amount of time in response to detecting a shutter button press.

8. The image capturing device of claim 1, wherein said processor is further configured to store said second image as a final image in response to the expiration of said hold out timer.

9. The image capturing device of claim 1, said memory further including a hold timeout timer tat stores a predetermined hold timeout period and wherein said current image is stored as a final image if said hold timeout timer expires.

10. An image capturing method, comprising:

detecting a shutter button press; and

in response to detecting the shutter button press, performing an image capturing operation, wherein the image capturing operation produces a final image and comprises the acts of;

(a) capturing a previous image;

(b) capturing a current image;

(c) determining if said current image is stable with regard to motion;

(d) if it is determined that said current image is stable with regard to motion. then storing the current image as the final image of the image capturing operation; and

(e) if it is determined that said current image is not stable with regard to motion, then repeating steps (b) through (e).

11. The method of claim 10, further comprising

setting a hold out timer to expire in a predetermined amount of time in response to detecting the shutter button press.

12. The method of claim 11, further comprising the step of storing said current image as the final image upon expiration of said hold timeout timer.

13. The method of claim 10, further comprising the step of waiting a predetermined un age interval between image captures.

14. The method of claim 10, wherein the step of comparing compares all pixels in said current image and in said previous image.

15. The method of claim 10, wherein the step of comparing compares a predetermined sampling pattern of pixels in said current image and in said previous image.

16. The method of claim 10, wherein the step of comparing compares a predetermined region in said current image and in said previous image.

17. The method of claim 10, wherein the step of comparing compares a user-designated region in said current image and in said previous image.

18. The method of claim 10, wherein the step of comparing compares a user-designated object in said current image and in said previous image.

19. The method of claim 10, wherein the step of comparing compares a plurality of regions in said current image to a corresponding plurality of regions in said previous image, and wherein said current image is determined to be stable when all regions in said plurality of regions are determined to be stable.

20. An image capturing method, comprising the steps of:

detecting a shutter button press; and

in response to detecting the shutter button press, performing an image capturing operation, wherein the image capturing operation produces a final image and comprises the acts of;

setting a hold out timer to expire in a predetermined amount of time;

capturing a first image;

capturing a second image after capturing the first image;

comparing the second image to the first image;

determining whether the hold out timer has expired;

if it is determined that the hold out timer has expired, then storing the second image as the final image of the image capturing operation;

determining if the second image is stable with regard to motion;

if the second image is stable with regard to motion, then storing the second image as the final image, and

if the second image is not stable with regard to motion, then (i) capturing a third image and (ii) comparing the third image to the second image.

21. The method of claim 20, further comprising the step of waiting a predetermined time interval between image captures.

22. The method of claim 20, wherein the step of comparing compares all pixels in said second image and in said first image.

23. The method of claim 20, wherein the step of comparing compares a predetermined sampling pattern of pixels in said second image and in said first image.

24. The method of claim 20, wherein the step of comparing compares a predetermined region in said second image and in said first image.

25. The method of claim 20, wherein the step of comparing compares a user-designated region in said second image and in said first image.

26. The method of claim 21, wherein the step of comparing compares a user-designated object in said second image and in said first image.

27. The method of claim 21, wherein the step of comparing compares a plurality of regions in said second image to a corresponding plurality of regions in said first image, and wherein said second image is determined to be stable when all regions in said plurality of regions are determined to be stable.