Motion detection system and method

• US 8,638,991 B2
• Filed: 07/21/2008
• Issued: 01/28/2014
• Est. Priority Date: 07/26/2007
• Status: Active Grant

• Current Assignee: BAR ILAN University, Universtitat D.E. Valencia
• Original Assignee: BAR ILAN University, Universtitat D.E. Valencia
• Inventors: Zalevsky, Zeev, Garcia, Javier
• Primary Examiner(s): BHATNAGAR, ANAND P
• Application Number:
  US12/670,477
• Publication Number:
  US 20100226543A1
• Time in Patent Office: 2,017 Days
• Field of Search: 382/100, 382/103, 382/106, 382/107, 382/128, 382/129, 382/130, 382/131, 382/132, 382/181, 382/190, 382/195, 348169-172, 704200-504, 73/14.8, 73/18.2, 73/544.1, 702/54, 702/56, 381/56, 372/4, 375/316, 375/325
• US Class Current: 382/107
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: G01B 9/02083 characterised by particular signal processing and presentation
• CPC Class Codes: G01B 9/02094 Speckle interferometers, i.e. for detecting changes in speckle pattern
• CPC Class Codes: G01H 9/002 for representing acoustic field distribution sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00

Abstract

A method is presented for imaging an object. The method comprises imaging a coherent speckle pattern propagating from an object, using an imaging system being focused on a plane displaced from the object.

Claims

1. A method for use in motion detection of an object, the method comprising:

providing a system comprising a source of a beam of coherent light and an imaging system capable of being focused on a plane displaced from an intersection of the beam and a field of view of the imaging system and being in a far field from said intersection;

operating said system for illuminating an object by the beam of coherent light, and imaging the coherent speckle pattern, originated at and propagating from the object, while focusing the imaging system on a plane being in a far field of the object and being located further than D²/4λ

from the object, D and λ

being respectively a size and a wavelength of the speckle pattern at the object.

2. The method of claim 1, wherein said displaced plane is located between the imaging system and the object, or is located further from the imaging system than the object.

3. The method of claim 1, wherein the object is moving.

4. The method of claim 3, wherein the movement is associated with a vibration of at least one of the following:

vibration of a living body'"'"'s part, and a cloth on a living body.

5. The method of claim 3, wherein the movement is associated with a vibration, said vibration corresponding to at least one of the following:

a speech, a sequence of heart beats, a heart beat resolved to a heart beat'"'"'s structure, and a blood pressure.

6. The method of claim 5, wherein the imaging is repeated at least two times for obtaining a sequence of at least two said speckle pattern images.

7. The method of claim 6, comprising:

processing image of the object obtained by said imaging of the coherent speckle pattern propagating from the object, said processing comprising at least one of the following;

extracting the speech from said sequence;

extracting the sequence of heart beats, extracting the heart beat'"'"'s structure, extracting the heart beat'"'"'s structure and comparing it with a heart beat'"'"'s structure of the same or different heart.

8. The method of claim 3, wherein the movement is associated with a vibration of a living body'"'"'s part, said vibration corresponding to a speech.

9. The method of claim 3, wherein the movement is associated with a vibration of a living body'"'"'s part, said living body'"'"'s part being at least one of a hand joint, a chest, a throat, a temporal fossa, a throat, a cheekbone, a head, a stomach.

10. The method of claim 3, wherein the movement is associated with a vibration, said vibration being that of a vehicle'"'"'s part.

11. The method of claim 10, wherein said vehicle'"'"'s part comprises at least one of vehicle interior or exterior parts.

12. The method of claim 10, wherein said vehicle'"'"'s part is a part of vehicle'"'"'s engine.

13. The method of claim 1, comprising:

determining at least one shift between regions of the object which appear in at least first and second images of the object, each of said regions including the stationary speckle pattern formed by light originated at the same region of the object and imaged by focusing the imaging system on the plane which is displaced from the object and located in the far field of the object; and

determining motion of the object along transverse, axial, and tilt dimensions.

14. The method of claim 1, comprising determining a shift between regions of the object which appear in first and second images of the object, each of said regions including the stationary speckle pattern formed by light originated at the same region of the object and imaged by focusing the imaging system on the plane which is displaced from the object and is located in the far field of the object.

15. A system for use in motion detection, the system comprising:

a source of a beam of coherent light and an imaging system, said imaging system being capable of being focused on a plane displaced from an intersection of the beam and a field of view of the imaging system and being in a far field from said intersection; and

a processing unit associated with said imaging system, said processing unit being configured and operable to determine a shift between two images of a speckle pattern originated at the intersection location, said processing unit being configured for communication with a device comprising a memory unit, comprising data indicative of a sequence of images of a stationary coherent speckle pattern originated at a subject, being indicative of the subject'"'"'s heart beats and/or heart beat structure, said sequence being thereby enabled for use in determination of at least one physiological parameter.

16. The system of claim 15, wherein said plane is located either between the imaging system and the intersection location or is located further from the imaging system than the intersection location.

17. A system of claim 15, wherein said processing unit is configured for determining at least one of the following:

a sequence of shift values between the images in the sequence of images of the stationary speckle pattern; and

a spectrogram of a sequence of shift values.

18. The system claim 15, wherein said plane is located further than D²/4λ

from the intersection location, D and λ

being respectively a size and a wavelength of a speckle pattern originated at the intersection location, said plane thereby being in a far field of the intersection location.

19. The system of claim 15, wherein the processing unit is configured to operate the imaging system to repeat imaging at least two times for obtaining a sequence of at least two images of the speckle pattern.

20. The system of claim 15, wherein the processing unit is configured for processing an image of the intersection location obtained by imaging of the coherent speckle pattern propagating from the intersection location, said processing comprising at least one of the following:

extracting a speech from said sequence;

extracting the sequence of heart beats, extracting a heart beat'"'"'s structure, extracting a heart beat'"'"'s structure and comparing it with a heart beat'"'"'s structure of the same or different heart.

21. A system for use in for use in motion detection, the system comprising:

a source of a beam of coherent light and an imaging system, said imaging system being capable of being focused on a plane displaced from an intersection of the beam and a field of view of the imaging system; and

a processing unit associated with said imaging system, said processing unit being configured and operable to determine a shift between two images of a speckle pattern originated at the intersection location, wherein said processing unit is configured for communication with a device comprising a memory unit comprising data indicative of a sequence of images of a stationary speckle pattern originated at a subject, said sequence being indicative of the subject'"'"'s speech.

22. The system of claim 21, wherein said data comprises at least one of the following:

the sequence of images of the stationary speckle pattern; and

a sequence of shift values between the images of the stationary coherent speckle pattern, said sequence being indicative of the speech.

23. The system of claim 21, wherein said sequence comprises an image of at least one of a throat, a cheekbone, a head.

24. The system of claim 21, comprising a processor for determining a spectrogram of said sequence of shift values, said sequence being taken with a rate of 2 kHz or higher.

25. The system of claim 21, wherein said plane is located either between the imaging system and the intersection location or is located further from the imaging system than the intersection location.

26. The system of claim 21, wherein said plane is located further than from the intersection location, and being respectively a size and a wavelength of a speckle pattern originated at the intersection location, said plane thereby being in a far field of the intersection location.

27. The system of claim 21, wherein the processing unit is configured to operate the imaging system to repeat imaging at least two times for obtaining a sequence of at least two images of the speckle pattern.

28. The system of claim 21, wherein the processing unit is configured for processing an image of the intersection location obtained by imaging of the coherent speckle pattern propagating from the intersection location, said processing comprising at least one of the following:

extracting a speech from said sequence;

extracting the sequence of heart beats, extracting a heart beat'"'"'s structure, extracting a heart beat'"'"'s structure and comparing it with a heart beat'"'"'s structure of the same or different heart.

29. A system for use in for use it motion detection, the system comprising:

a source of a beam of coherent light and an imaging system, said imaging being capable of being focus on a plane displaced from an intersection of the beam and a field of view of the imaging system; and

a processing unit associated with said imaging system, said processing unit being configured and operable to determine a shift between two images of a speckle pattern originated at the intersection location, wherein said processing unit is configured for communication with a device comprising a memory comprising data indicative of a sequence of images of a stationary speckle pattern originated at a vehicle, the images being indicative of vibrations associated with the vehicle and the sequence being indicative of the vehicle operation.

30. The system of claim 29, wherein said plane is located either between the imaging system and the intersection location or is located further from the imaging system than the intersection location.

31. The system of claim 29, wherein said plane is located further than from the intersection location, and being respectively a size and a wavelength of a speckle pattern originated at the intersection location, said plane thereby being in a far field of the intersection location.

32. The system of claim 29, wherein the processing unit is configured to operate the imaging system to repeat imaging at least two times for obtaining a sequence of at least two images of the speckle pattern.

33. The system of claim 29, wherein the processing unit is configured for processing an image of the intersection location obtained by imaging of the coherent speckle pattern propagating from the intersection location, said processing comprising at least one of the following:

extracting a speech from said sequence;

extracting the sequence of heart beats, extracting a heart beat'"'"'s structure, extracting a heart beat'"'"'s structure and comparing it with a heart beat'"'"'s structure of the same or different heart.

34. A method for use in motion detection of an object, the method comprising:

providing a system comprising a source of a beam of coherent light and an imaging system capable of being focused on a plane displaced from an intersection of the beam and a field of view of the imaging system;

operating said system for illuminating an object by the beam of coherent light, and imaging the coherent speckle pattern, originated at and propagating from the object, by an imaging system being focused on a plane displaced from the object; and

determining at least one shift between regions of the object which appear in at least first and second images of the object, each of said regions including the stationary speckle pattern formed by light originated at the same region of the object and imaged by focusing the imaging system on the plane which is displaced from the object.

35. The method claim 34, wherein said plane is located further than D²/4λ

from the object, D and λ

being respectively a size and a wavelength of the speckle pattern at the object.

36. The method of claim 34, comprising utilizing the determined at least one shift between said regions of the object, and determining motion of the object along transverse, axial, and tilt dimensions.

37. The method of claim 36, wherein the object is moving.

38. The method of claim 37, wherein the movement is associated with a vibration of at least one of the following:

vibration of a living body'"'"'s part, and a cloth on a living body.

39. The method of claim 38, wherein the movement is associated with the vibration corresponding to at least one of the following:

a speech, a sequence of heart beats, a heart beat resolved to a heart beat'"'"'s structure, and a blood pressure;

a vibration of a living body'"'"'s part being at least one of a hand joint, a chest, a throat, a temporal fossa, a throat, a cheekbone, a head, a stomach;

a vibration of a vehicle'"'"'s part comprises at least one of vehicle interior or exterior parts.

40. The method of claim 39, wherein the imaging is repeated at least two times for obtaining a sequence of at least two said speckle pattern images.