SYSTEMS AND METHODS FOR SPATIALLY CONTROLLED SCENE ILLUMINATION
First Claim
1. A system for monitoring an eye of a person, comprising:
- a device configured to be worn on a person'"'"'s head;
a camera mounted on the device and positioned for viewing a first eye of the person wearing the device;
a plurality of light sources on the device that preferentially illuminate respective focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view; and
a controller coupled to the camera and the light sources, the controller configured for sampling brightness in the respective focal regions of the light sources using the camera and modulating the light sources based at least in part on the sampled brightness to provide desired brightness levels within the respective focal regions.
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0 Petitions
Accused Products
Abstract
A scene illumination system is provided that produces spatially uniform or controlled brightness levels for machine vision applications. The system includes a camera, multiple light sources that preferentially illuminate different regions within the camera'"'"'s field-of-view, and a processing unit coupled to the camera and light sources. Focal regions of the light sources within the camera'"'"'s field-of-view are sampled to determine average regional brightness and compared to target brightness levels. The processing unit controls the light/sources to increase or decrease illumination levels to converge toward the target brightness levels within the field-of-view. This modulation of the light sources may be repeated with successive video images until target brightness levels are achieved. Once achieved, the iterative feedback control may be locked-in for some applications, while for others, the iterative process may continue periodically or continuously to account for different scenes or changes in lighting conditions.
Target brightness levels can be the same throughout the camera'"'"'s field-of-view to generate uniform brightness, or vary as a function of location to generate controlled brightness levels within a scene. Target brightness levels can also be made to vary with time.
238 Citations
70 Claims
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1. A system for monitoring an eye of a person, comprising:
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a device configured to be worn on a person'"'"'s head; a camera mounted on the device and positioned for viewing a first eye of the person wearing the device; a plurality of light sources on the device that preferentially illuminate respective focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view; and a controller coupled to the camera and the light sources, the controller configured for sampling brightness in the respective focal regions of the light sources using the camera and modulating the light sources based at least in part on the sampled brightness to provide desired brightness levels within the respective focal regions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8-11. -11. (canceled)
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12. A feedback controlled system for producing spatially controlled illumination comprising:
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a camera that measures scene brightness in two or more spatial regions of a field-of-view; light sources that preferentially illuminate corresponding regions within the camera'"'"'s field-of-view; and a processor that computes average brightness within each region of the camera'"'"'s field-of-view and modulates corresponding light sources to one or more target brightness levels to provide desired brightness levels within the field-of-view. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31)
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21-24. -24. (canceled)
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32-34. -34. (canceled)
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35. A method for controlling illumination of a first eye of a person, comprising:
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positioning a camera towards a person'"'"'s face such that a first eye of the person lies within a field-of-view of the camera; illuminating at least a portion of the person'"'"'s face with a plurality of light sources that preferentially illuminate respective focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view; sampling brightness in the respective focal regions of the light sources using the camera; and modulating the light sources based at least in part on the sampled brightness to provide desired brightness levels within the respective focal regions. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42-44. -44. (canceled)
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45. A method for controlling illumination of a scene, comprising:
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directing a camera towards a scene such that one or more objects in the scene are within a field-of-view of the camera; illuminating the scene with a plurality of light sources that preferentially illuminate respective focal regions within the camera'"'"'s field-of-view; sampling brightness in the respective focal regions of the light sources using the camera; and modulating the light sources based at least in part on the sampled brightness to provide desired brightness levels within the respective focal regions. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 67, 68, 69, 70)
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63-66. -66. (canceled)
Specification