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 simultaneously and preferentially illuminate respective separate focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view, the focal regions only partially overlapping one another; 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 increase or decrease intensity of light from the light sources to provide desired brightness levels within the respective focal regions.
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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.
129 Citations
52 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 simultaneously and preferentially illuminate respective separate focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view, the focal regions only partially overlapping one another; 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 increase or decrease intensity of light from the light sources to provide desired brightness levels within the respective focal regions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 simultaneously and preferentially illuminate corresponding separate or overlapping focal regions within the camera'"'"'s field-of-view, the focal regions having different centers than one another; 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 (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. 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 simultaneously and preferentially illuminate respective separate focal regions of the person'"'"'s face around the first eye and within the camera'"'"'s field-of-view, the focal regions only partially overlapping one another; 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 (25, 26, 27, 28, 29, 30)
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31. 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 simultaneously and preferentially illuminate respective separate or overlapping 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 (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification