Selective and adaptive illumination of a target

• US 8,081,797 B2
• Filed: 10/10/2008
• Issued: 12/20/2011
• Est. Priority Date: 10/10/2008
• Status: Active Grant

• Current Assignee: Institut national d'optique
• Original Assignee: Institut national d'optique
• Inventors: Jerominek, Hubert, Bergeron, Alain
• Primary Examiner(s): Azarian, Seyed
• Application Number:
  US12/249,436
• Publication Number:
  US 20100092031A1
• Time in Patent Office: 1,166 Days
• Field of Search: 382/100, 382/103, 382/106, 382/107, 382/162, 382/165, 382/168, 382/173, 382/181, 382/224, 382/232, 382/254, 382/274, 382/275, 382/276, 382/284, 382/291, 382/305, 382/312, 362/303, 362/465, 362/611, 701/49, 352/49, 715/745, 356/425
• US Class Current: 382/103
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/20 Electroluminescent [EL] light sources
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths

Abstract

There are provided a method and a system for illuminating one or more target in a scene. An image of the scene is acquired using a sensing device that may use an infrared sensor for example. From the image, an illumination controller determines an illumination figure, such that the illumination figure adaptively matches at least a position of the target in the image. The target is the selectively illuminated using an illumination device, according to the illumination figure.

Claims

1. A system for illuminating at least one target in a scene, the system comprising:

an input for receiving an image updated in time acquired on said scene, said image comprising said target;

an illumination device having an illumination field and adapted to illuminate a selected portion only of said illumination field according to an illumination figure for selectively illuminating said target in said illumination field; and

an illumination controller for determining said illumination figure from said image such that said portion adaptively matches at least a position of said target in said image, said illumination figure being determined according to a known registration between said image and said illumination field, said illumination figure being updated in time as a function of said image such that said illumination figure tracks said target as it moves in the scene.

2. The system as claimed in claim 1, further comprising a sensing device for acquiring said image.

3. The system as claimed in claim 2, wherein said sensing device is an infrared sensor.

4. The system as claimed in claim 2, wherein said sensing device operates in at least one of the x-ray spectrum, the ultra-violet spectrum, the near-infrared spectrum, the mid-infrared spectrum, the long-infrared spectrum and the terahertz spectrum.

5. The system as claimed in claim 2,

wherein said sensing device comprises a sensor array defining an array of sensor pixels, said sensor pixels individually corresponding to points in said image;

and

wherein said registration comprises a correspondence between points in said image and points in said illumination figure.

6. The system as claimed in claim 1, further comprising:

an image processor for processing said image to extract a shape and said position of said target in said image.

7. The system as claimed in claim 1, wherein said illumination device comprises an array of light sources, said light sources individually corresponding to points in said illumination figure.

8. The system as claimed in claim 1, wherein said illumination device comprises a single light source and a spatial light modulator array coupled thereto to define an array of illumination zones individually corresponding to points in said illumination figure.

9. The system as claimed in claim 1, wherein said illumination device comprises at least one of a laser diode, a light emitting diode and a light bulb.

10. A system comprising a plurality of sub-systems as the system claimed in claim 1, wherein the sub-systems are positioned at different view points relative to the same one of said scene.

11. A method for illuminating at least one target in a scene, the method comprising:

acquiring an image of said scene and updating said image in time, said image comprising said target;

determining, from said image, an illumination figure defined on an illumination field and updating said illumination figure in time, such that said illumination figure adaptively matches at least a position of said target in said image, said illumination figure being determined according to a known registration between said image and said illumination field; and

illuminating a selected portion only of said illumination field according to said illumination figure for selectively illuminating said target in said illumination field as it moves in the scene.

12. The method as claimed in claim 11, further comprising:

processing said image to extract a shape and said position of said target in said image.

13. The method as claimed in claim 11, wherein said illuminating a portion comprises:

activating part of an array of light sources so that said target is selectively illuminated in said illumination field, said light sources individually corresponding to points in said illumination figure.

14. The method as claimed in claim 11, wherein said acquiring an image comprises acquiring an infrared radiation of said scene.

15. The method as claimed in claim 11, wherein said illuminating a portion only of said illumination field comprises emitting a light in the visible spectrum.

16. A system for illuminating at least one target in a scene, the system comprising:

an input for receiving an image acquired on said scene, said image comprising said target;

an illumination device having an illumination field and adapted to illuminate a selected portion only of said illumination field according to an illumination figure for selectively illuminating said target in said illumination field, said illumination device comprising a single light source and a spatial light modulator array coupled thereto to define an array of illumination zones individually corresponding to points in said illumination figure; and

an illumination controller for determining said illumination figure from said image such that said portion adaptively matches at least a position of said target in said image, said illumination figure being determined according to a known registration between said image and said illumination field.

17. The system as claimed in claim 16, further comprising a sensing device for acquiring said image.

18. The system as claimed in claim 17, wherein said sensing device is an infrared sensor.

19. The system as claimed in claim 17, wherein said sensing device operates in at least one of the x-ray spectrum, the ultra-violet spectrum, the near-infrared spectrum, the mid-infrared spectrum, the long-infrared spectrum and the terahertz spectrum.

20. The system as claimed in claim 17, wherein said sensing device comprises a sensor array defining an array of sensor pixels, said sensor pixels individually corresponding to points in said image;

and

wherein said registration comprises a correspondence between points in said image and points in said illumination figure.

21. The system as claimed in claim 16, further comprising:

an image processor for processing said image to extract a shape and said position of said target in said image.

22. The system as claimed in claim 16, wherein said illumination device comprises an array of light sources, said light sources individually corresponding to points in said illumination figure.

23. The system as claimed in claim 16, wherein said illumination device comprises at least one of a laser diode, a light emitting diode and a light bulb.

24. A system comprising a plurality of sub-systems as the system claimed in claim 16, wherein the sub-systems are positioned at different view points relative to the same one of said scene.

25. A method for illuminating at least one target in a scene, the method comprising:

acquiring an image of said scene, said image comprising said target;

determining, from said image, an illumination figure defined on an illumination field, such that said illumination figure adaptively matches at least a position of said target in said image, said illumination figure being determined according to a known registration between said image and said illumination field; and

illuminating a selected portion only of said illumination field according to said illumination figure by activating part of an array of light sources for selectively illuminating said target in said illumination field, said light sources individually corresponding to points in said illumination figure.

26. The method as claimed in claim 25, further comprising:

processing said image to extract a shape and said position of said target in said image.

27. The method as claimed in claim 25, wherein said acquiring an image comprises acquiring an infrared radiation of said scene.

28. The method as claimed in claim 25, wherein said illuminating a portion only of said illumination field comprises emitting a light in the visible spectrum.