Moisture sensor and windshield fog detector
First Claim
1. A fog detection system for detecting fog on a vehicle windshield, said system comprising:
- an image sensor;
an optical system operative to image at least a portion of the surface of the windshield onto the image sensor;
an illumination device for illuminating an area within the at least one portion of the windshield surface, said optical system and illumination device configured to image reflections caused by fog on the inside and outside of the windshield in a different positions on said image sensor; and
a processing system in communication with the image sensor and operative to analyze images from the image sensor to determine whether there is fog on the inside or outside of the windshield based upon the spatial position of the imaged reflections on said image sensor.
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Accused Products
Abstract
A control system is disclosed for automatically detecting moisture on the windshield of a vehicle. The automatic moisture detecting system includes an optical system for imaging a portion of the windshield onto an image array sensor, such as a CMOS active pixel sensor. The voltage of each of the pixels which represents the illumination level is converted to a corresponding gray scale value by an analog digital converter. The spatial frequency composition of the gray scale values are analyzed to determine the amount of rain present in order to provide a control signal to control the operation of the windshield wipers of the vehicle as a function of the amount of moisture present. The system is also adapted to detect the level of fog both on the interior of the windshield as well as the exterior of the windshield.
63 Citations
24 Claims
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1. A fog detection system for detecting fog on a vehicle windshield, said system comprising:
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an image sensor; an optical system operative to image at least a portion of the surface of the windshield onto the image sensor; an illumination device for illuminating an area within the at least one portion of the windshield surface, said optical system and illumination device configured to image reflections caused by fog on the inside and outside of the windshield in a different positions on said image sensor; and a processing system in communication with the image sensor and operative to analyze images from the image sensor to determine whether there is fog on the inside or outside of the windshield based upon the spatial position of the imaged reflections on said image sensor. - View Dependent Claims (2, 3)
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4. A fog detection system for detecting fog on a vehicle windshield, said system comprising:
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an image sensor; an optical system operative to image at least a portion of the surface of the windshield onto the image sensor; an illumination device for selectively illuminating an area within the at least one portion of the windshield surface; and a processing system in communication with the image sensor and said illumination device and operative to selectively activate and deactivate said illumination device and to analyze and compare images from the image sensor when said illumination device is activated and deactivated to detect fog on the windshield.
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5. A windshield wiper control system for a vehicle comprising:
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an image sensor; an optical system operative to image at least a portion of the surface of the windshield onto the image sensor, said optical system is further operative to blur distant objects in the imaged scene while sharply focusing objects on the windshield; and a processing system in communication with the image sensor and operative to analyze images from the image sensor to detect moisture on the windshield and to activate the windshield wipers when moisture is detected. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A windshield wiper control system for a vehicle comprising:
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an image sensor; an optical system operative to image at least a portion of the surface of the windshield onto the image sensor; an illuminator for providing supplemental illumination across substantially all of the imaged portion of the windshield surface; and a processing system in communication with the image sensor and the illuminator and operative to analyze images from the image sensor to detect moisture on the windshield and to activate the windshield wipers when moisture is detected. - View Dependent Claims (12, 13, 14, 15)
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16. A windshield wiper control system for a vehicle comprising:
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an image sensor; an optical system operative to image at least a portion of the surface of the windshield onto the image sensor; and a processing system in communication with the image sensor and operative to analyze images from the image sensor to detect moisture on the windshield and to activate the windshield wipers when moisture is detected, said processing system is further operative to detect operation of a windshield wiper and to obtain a baseline image of the windshield immediately after it has been wiped by the windshield wiper, said processing system utilizing the baseline image to distinguish moisture from bugs, cracks, dirt, and other debris on the windshield. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification