Image-shake correcting device for detecting vibration frequency and for changing vibration characteristics

• US 6,233,009 B1
• Filed: 10/15/1997
• Issued: 05/15/2001
• Est. Priority Date: 09/08/1993
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Fujiwara, Akihiro, Morofuji, Tsuyoshi
• Primary Examiner(s): Bella, Matthew C.
• Application Number:
  US08/950,820
• Time in Patent Office: 1,308 Days
• Field of Search: 348/207, 348/208, 348/214, 396/52, 396/53, 396/55, 382/254
• US Class Current: 348/208.8
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur imaging systems in general using optical elements for stabilisation of the position of the image G02B27/64
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 2217/005 Blur detection
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/6815 by distinguishing pan or tilt from motion
• CPC Class Codes: H04N 23/683 performed by a processor, e.g. controlling the readout of an image memory
• CPC Class Codes: H04N 23/686 with a variable apex prism

Abstract

An image-shake correcting device includes a vibration sensor for detecting a vibration of an apparatus, a correcting member for correcting a movement of an image due to a vibration, a first controlling circuit for controlling the correcting member on the basis of an output of the vibration sensor and driving the correcting member in a direction in which the movement of the image is corrected, a detecting circuit for detecting a frequency and an amplitude of the vibration from the output of the vibration sensor, and a second controlling circuit for controlling a characteristic of the first controlling circuit on the basis of an output of the detecting circuit.

Claims

1. A shake compensating apparatus, comprising:

a) detecting means for detecting a shake of the apparatus;

b) filter means for extracting a predetermined frequency component signal;

c) computing means for computing a compensation value on the basis of the predetermined frequency component signal and a time delay between said shake and a shake detecting operation of said detecting means; and

d) compensating means for compensating a movement of an image caused by the shake of the apparatus on the basis of the compensation value.

2. An apparatus according to claim 1, wherein said compensating means compensates the movement of the image with an image signal.

3. A shake compensating apparatus, comprising:

a) detecting means for detecting a shake of the apparatus and outputting a shake detecting value;

b) delay correcting means for correcting the shake detecting value output from said detecting means so as to compensate a time delay between the shake and a shake detecting operation of said detecting means;

c) computing means for computing a shake compensation value on the basis of an output of said delay correcting means; and

d) compensating means for compensating a movement of an image caused by the shake of the apparatus on the basis of the compensation value.

4. An apparatus according to claim 3, wherein said delay correcting means compensates the time delay in an analog signal process.

5. An apparatus according to claim 3, wherein said delay correcting means compensates the time delay in a digital signal process.

6. An apparatus according to claim 3, wherein said compensating means compensates the movement of the image with an image signal.

7. An apparatus according to claim 3, further comprising:

gain correcting means for correcting a gain of detecting means.

8. A camera apparatus comprising:

a) shake detecting means;

b) phase correcting means for shifting a phase of an output of said shake detecting means by a predetermined amount corresponding to a delay of a shake detecting operation of said shake detecting means;

c) computing means for computing a shake correcting signal on the basis of an output of said phase correcting means; and

d) correcting means for correcting a movement of an image caused by shake on the basis of the shake correcting signal outputted by said computing means.

9. A camera apparatus according to claim 8, wherein said phase correcting means performs a phase advance correction which compensates delay of the phase of the output of said shake correcting means.

10. An apparatus according to claim 8, wherein said phase correcting means shifts the phase in an analog signal process.

11. An apparatus according to claim 8, wherein said phase correcting means shifts the phase in a digital signal process.

12. An apparatus according to claim 8, wherein said correcting means compensates the movement of the image with an image signal.

13. An apparatus according to claim 8, further comprising:

gain correcting means for correcting a gain of said shake detecting means.

14. A camera apparatus comprising:

a) shake detecting means;

b) filter means for performing phase advance compensation which advances a phase of an output of said shake detecting means on the basis of a delay of a shake detecting operation of said shake detecting means;

c) computing means for computing a shake correcting signal on the basis of an output of said filter means; and

d) correcting means for correcting a movement of an image caused by shake on the basis of the shake correcting signal outputted from said computing means.

15. An apparatus according to claim 14, wherein said filter means advances the phase in an analog signal process.

16. An apparatus according to claim 14, wherein said filter means advances the phase in a digital signal process.

17. An apparatus according to claim 14, wherein said correcting means compensates the movement of the image with an image signal.

18. An apparatus according to claim 14, further comprising:

gain correcting means for correcting a gain of said shake detecting means.

19. A camera apparatus comprising:

a) an angle speed sensor for detecting shake;

b) correcting means for correcting a shake of an image caused by the shake according to an output of said angle speed sensor; and

c) delay compensating means, located between said angle speed sensor and said correcting means, for compensating a delay in detection of generation of the shake.

20. An apparatus according to claim 19, wherein said delay compensating means compensates the delay in an analog signal process.

21. An apparatus according to claim 19, wherein said delay compensating means compensates the delay in a digital signal process.

22. An apparatus according to claim 19, wherein said correcting means corrects the movement of the image with an image signal.

23. An apparatus according to claim 19, further comprising:

gain correcting means for correcting a gain of angle speed sensor.

24. A camera comprising:

a) an angle speed sensor for detecting shake;

b) correcting means for correcting a movement of an image caused by the shake according to an output of said angle speed sensor; and

c) phase compensating means for compensating a predetermined delay in a transmission system formed by said angle speed sensor and said correcting means.

25. A camera according to claim 24, wherein said phase compensating means compensates the predetermined delay in an analog signal process.

26. A camera according to claim 24, wherein said phase compensating means compensates the predetermined delay in a digital signal process.

27. A camera according to claim 24, wherein said correcting means compensates the movement of the image with an image signal.

28. A camera according to claim 24, further comprising:

gain correcting means for correcting a gain of said shake detecting means.

29. An apparatus comprising:

a shake detection device;

a compensation device that compensates a shake of an image in accordance with said shake detection device; and

a delay correction device that corrects a shake detection time delay between the shake and a shake detection operation of said shake detection device.

30. An apparatus according to claim 29, wherein said delay correction device comprises a filter.

31. An apparatus according to claim 29, wherein said delay correction device advances a phase of an output of said shake detection device.

32. An apparatus according to claim 29, wherein said delay correction device corrects the shake detection delay in an analog signal process.

33. An apparatus according to claim 29, wherein said delay correction device corrects the shake detection delay in a digital signal process.

34. An apparatus according to claim 29, wherein said compensation device compensates the shake of the image with an image signal.

35. An apparatus according to claim 29, further comprising:

gain correcting means for correcting a gain of said shake detection device.

36. An apparatus according to claim 29, wherein said apparatus comprises a camera.

37. An apparatus according to claim 29, wherein said apparatus comprises an optical apparatus.