SOLID STATE LIGHTING FIXTURES AND IMAGE CAPTURE SYSTEMS
First Claim
1. A lighting fixture comprising:
- a plurality of LEDs providing a light source for general illumination of an environment; and
fixture control circuitry configured to provide a pulse width modulated (PWM) drive signal having a PWM period and a variable duty cycle wherein varying the duty cycle varies an intensity of light emitted from the plurality of LEDs, and the PWM period is an integer multiple of a frame period of a camera operating in the environment.
3 Assignments
0 Petitions
Accused Products
Abstract
An LED-based lighting fixture sets or adjusts a parameter of a drive signal that is used to drive its LEDs to be more compatible with the camera system; the camera system sets or adjusts an image capture parameter to be more compatible with the LED-based lighting fixture, or a combination thereof. The drive signal may be a PWM signal with a variable PWM frequency and/or duty cycle, a variable DC signal, or any combination thereof. The parameter of the drive signal that may be set or adjusted includes, but is not limited to, a PWM period, PWM frequency, PWM duty cycle, amplitude of the active and inactive portions of the PWM signal, and the like. The image capture parameter that may be adjusted includes, but is not limited to, frame rate, frame period, integration time, gain, shutter type (i.e. rolling shutter, global shutter, etc.), and the like.
80 Citations
22 Claims
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1. A lighting fixture comprising:
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a plurality of LEDs providing a light source for general illumination of an environment; and fixture control circuitry configured to provide a pulse width modulated (PWM) drive signal having a PWM period and a variable duty cycle wherein varying the duty cycle varies an intensity of light emitted from the plurality of LEDs, and the PWM period is an integer multiple of a frame period of a camera operating in the environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A camera system comprising:
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an image sensor for capturing video of an environment at a frame rate; camera control circuitry associated with the image sensor and configured to control the frame rate of the image sensor such that a pulse width modulated (PWM) period used by at least one lighting fixture that is illuminating the environment is an integer multiple of a frame period for the frame rate; and at least one interface configured to output the video. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system comprising:
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a lighting system comprising at least one lighting fixture comprising; a plurality of LEDs providing a light source for general illumination of an environment; and fixture control circuitry configured to provide a pulse width modulated (PWM) drive signal having a PWM period and a variable duty cycle, wherein varying the duty cycle varies an intensity of light emitted from the plurality of LEDs; and a camera system comprising; an image sensor for capturing video of the environment at a frame rate; camera control circuitry associated with the image sensor and configured to control the frame rate of the image sensor, wherein the PWM period used by the at least one lighting fixture that is illuminating the environment is an integer multiple of a frame period for the frame rate; and at least one interface configured to output the video to a monitor. - View Dependent Claims (17, 18, 19)
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20. A lighting fixture comprising:
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a plurality of LEDs providing a light source for general illumination; and fixture control circuitry configured to provide a pulse width modulated (PWM) drive signal having a PWM period and a variable duty cycle wherein varying the duty cycle varies an intensity of light emitted from the plurality of LEDs, and the PWM period is or is an integer multiple of at least one of a group consisting of 8.333 milliseconds (ms), 2.083 ms, 1.667 ms, or 1.389 ms. - View Dependent Claims (21, 22)
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Specification