Optical detector for windshield wiper control
First Claim
1. A method of detecting obscuring moisture on a windshield of an automotive vehicle, comprising the steps of:
- illuminating the windshield with a source of light;
imaging said source of light along an optical axis and onto an imaging plane;
providing a light detector array having a plurality of light sensors on said imaging plane and centered on said optical axis for detecting said imaged source of light;
detecting intensity of said light imaged on a central one of said light sensors located on said optical axis;
detecting intensity of said light imaged on other ones of said light sensors located off said optical axis; and
measuring the intensity of said detected off-axis light versus said detected on-axis light for determining the presence of obscuring moisture on said windshield.
1 Assignment
0 Petitions

Accused Products

Abstract
An optical device is provided for detecting the degree of obscuring moisture or precipitation on the windshield of an automotive vehicle. A source of light, such as a light emitting diode (LED) or a laser diode, is positioned to illuminate the windshield. An optical imager and detector array senses light emitted by the source, either transmitted or reflected by the windshield, and imaged on the array. The light source and detector may be positioned in convenient, out-of-the-way locations inside or outside the windshield. When the windshield is free of obscuring precipitation, light from the source is imaged on a sensor of the array aligned with the optical axis of the imager. When obscuring moisture or precipitation is present on the windshield, light is scattered such that significant portions are imaged on sensors off the optical axis of the imager. The amount and spatial distribution of light received off the optical axis provides an indication of the degree of obscuration caused by light scattering moisture or precipitation present on the windshield. The detector is connected to the windshield wiper system of the vehicle to control activation of the wiper based on the optical detection of obscuring moisture or precipitation on the windshield.
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Magna Electronics Incorporated
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US 9,834,216 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 9,870,753 B2
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Gentex Corporation
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US 9,900,490 B2
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Magna Electronics Incorporated
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US 9,900,522 B2
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US 9,911,050 B2
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Magna Electronics Incorporated
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US 9,912,841 B2
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Magna Electronics Incorporated
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US 9,916,699 B2
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Magna Electronics Incorporated
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US 9,919,705 B2
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Magna Electronics Incorporated
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US 9,940,528 B2
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Magna Electronics Incorporated
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US 9,943,662 B2
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US 9,948,904 B2
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Magna Electronics Incorporated
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US 9,950,707 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 9,950,738 B2
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Magna Electronics Incorporated
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US 9,961,746 B2
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Gentex Corporation
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Gentex Corporation
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Vehicular imaging system comprising an imaging device with a single image sensor and image processor for determining a totally blocked state or partially blocked state of the single image sensor as well as an automatic correction for misalignment of the imaging device | ||
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US 9,972,100 B2
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Magna Electronics Incorporated
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US 9,988,047 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 9,994,175 B2
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Honda Motor Company
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Honda Motor Company
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US 10,003,755 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,015,452 B1
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,023,161 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,025,994 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,027,930 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,043,082 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,046,702 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,053,012 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,055,651 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,057,489 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,071,676 B2
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Magna Mirrors of America Incorporated
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Vehicle parking assist system with vision-based parking space detection | ||
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US 10,078,789 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Driver assistance system for vehicle | ||
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US 10,086,747 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,089,541 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,089,537 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,099,610 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,106,155 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,107,905 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,110,860 B1
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,115,310 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,118,618 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,127,738 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,132,971 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,144,352 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,144,353 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,171,709 B2
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Magna Electronics Incorporated
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US 10,187,615 B1
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,207,705 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,222,224 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,232,797 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,234,548 B2
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MAGNA Electronics Solutions GmbH
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US 10,257,432 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,284,764 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,286,855 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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System and method for estimating distance between a mobile unit and a vehicle using a TOF system | ||
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US 10,288,724 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Apparatus for humidification of breathable gas by dehumidification | ||
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US 10,300,238 B2
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ResMed Pty Ltd.
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Trailer driving assist system | ||
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US 10,300,855 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,300,856 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,306,190 B1
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Rear backup system for a vehicle | ||
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US 10,308,180 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with reduction of temporal noise in images | ||
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US 10,326,969 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,336,255 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,351,135 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular lane change system | ||
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US 10,406,980 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,427,679 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with reduced image color data processing by use of dithering | ||
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US 10,434,944 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Processing method for distinguishing a three dimensional object from a two dimensional object using a vehicular system | ||
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US 10,452,931 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with multi-paned view | ||
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US 10,457,209 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular control system | ||
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US 10,462,426 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Automotive lighting system for a vehicle | ||
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US 10,481,271 B2
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MAGNA Electronics Solutions GmbH
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MAGNA Electronics Solutions GmbH
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Vehicular vision system with rear backup video display | ||
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US 10,486,597 B1
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,493,916 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular trailer backup assist system | ||
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US 10,493,917 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular collision mitigation system | ||
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US 10,497,262 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular vision system | ||
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US 10,509,972 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with front and rear camera integration | ||
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US 10,515,279 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,523,904 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Rear backup system for a vehicle | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Method of synchronizing multiple vehicular cameras with an ECU | ||
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US 10,560,610 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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US 10,567,705 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Parking assist system | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Method for displaying video images for a vehicular vision system | ||
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US 10,574,885 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular control system with trailering assist function | ||
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US 10,586,119 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular rear backup vision system with video display | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with accelerated object confirmation | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Video processor module for vehicle | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Imaging system for vehicle | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Driver assistance system for vehicle | ||
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Donnelly Corporation
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Donnelly Corporation
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Vision system for vehicle | ||
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US 10,640,040 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Forward sensing system for vehicle | ||
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US 10,670,713 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular driving assist system using forward-viewing camera | ||
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US 10,683,008 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular driver assist system | ||
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US 10,685,243 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle control system with traffic driving control | ||
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US 10,688,993 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with collision mitigation | ||
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US 10,692,380 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular multi-camera vision system including rear backup camera | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular parking assist system that determines a parking space based in part on previously parked spaces | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular imaging system with blockage determination and misalignment correction | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Driver assistant system using influence mapping for conflict avoidance path determination | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular control system with traffic lane detection | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Adaptive forward lighting system for vehicle comprising a control that adjusts the headlamp beam in response to processing of image data captured by a camera | ||
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Magna Mirrors of America Incorporated
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Magna Electronics Incorporated
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Imaging system for vehicle | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular vision system including rear backup camera | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular collision mitigation system | ||
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US 10,803,744 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular adaptive headlighting system | ||
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US 10,807,515 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular rear backup vision system with video display | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicle vision system with incident recording function | ||
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US 10,819,943 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular vision system using image data transmission and power supply via a coaxial cable | ||
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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Vehicular control system | ||
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US 10,839,233 B2
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Magna Electronics Incorporated
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Magna Electronics Incorporated
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9 Claims
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1. A method of detecting obscuring moisture on a windshield of an automotive vehicle, comprising the steps of:
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illuminating the windshield with a source of light; imaging said source of light along an optical axis and onto an imaging plane; providing a light detector array having a plurality of light sensors on said imaging plane and centered on said optical axis for detecting said imaged source of light; detecting intensity of said light imaged on a central one of said light sensors located on said optical axis; detecting intensity of said light imaged on other ones of said light sensors located off said optical axis; and measuring the intensity of said detected off-axis light versus said detected on-axis light for determining the presence of obscuring moisture on said windshield. - View Dependent Claims (2, 3, 4, 5)
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6. A method of detecting obscuring matter on a windshield of an automotive vehicle, comprising the steps of:
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illuminating the windshield with a point source of light; imaging said point source of light along an optical axis and onto an imaging plane; providing a light detector array having a plurality of light sensors on said imaging plane; aligning said light detector array with said optical axis for detecting said imaged point source of light; detecting intensity of said light imaged on one of said light sensors aligned with said optical axis; detecting intensity of said light imaged on other ones of said light sensors located off said optical axis; measuring the intensity of said detected off-axis light versus said detected on-axis light for determining the presence of obscuring matter on said windshield; and measuring the distance of said detected off-axis light from said optical axis for determining the type and amount of obscuring matter on said windshield. - View Dependent Claims (7, 8, 9)
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1 Specification
The present invention relates to windshield wiper systems for automotive vehicles and, in particular, to an optical detector for measuring windshield obscuration and adjusting the frequency and/or speed of a windshield wiper in response to changing rates of precipitation.
Windshield wipers for modem automotive vehicles typically have several operating modes, such as fast, normal, and intermittent, that may be selected manually with a switch, dial, or sliding control. A driver generally activates the wiper system when the view through the windshield becomes distorted or obscured because of accumulated precipitation. The intermittent operating mode allows the driver to select a frequency of wiper operation that matches the intensity or rate of precipitation. When operated at the optimum speed and/or frequency, a windshield wiper provides good driver visibility without the distraction and annoyance of excessive activation.
When driving in conditions of variable precipitation, drivers often find themselves continually adjusting the speed and/or frequency of windshield wiper operation. Because each setting of the conventional wiper control provides a fixed speed and rate of activation, the setting must be manually adjusted every time the rate of precipitation changes. This increases driver workload (and annoyance) and diverts the driver'"'"'s attention away from the task of driving the vehicle. What is needed, therefore, is a device for automatically controlling a windshield wiper to provide the optimum speed and/or frequency of operation in response to changing rates of precipitation. Such a device would provide an improvement in safety as well as driver convenience.
The present invention is an optical device for detecting and measuring the degree of obscuration caused by moisture or precipitation on a windshield of an automotive vehicle. The optical device comprises a point source of light, such as a light emitting diode (LED) or a laser diode, positioned to illuminate the windshield, and an optical imager having optics for imaging light emitted by the source onto a detector array. The light source and optical imager may be positioned in convenient, out-of-the-way locations inside or outside the windshield. Depending on its location, the optical imager is aligned to receive light from the source that is either transmitted or reflected by the windshield. When the windshield is free of obscuring matter such as precipitation, light from the source is imaged on a center element of the detector array that is aligned with the optical axis of the imager. When precipitation is present, however, the light is scattered and significant portions are imaged off the optical axis and detected by off-axis elements of the detector array. The amount of light received off the optical axis provides an indication of the degree of obscuration caused by light scattering moisture or precipitation present on the windshield. The detector array may include a readout multiplexer and microprocessor connected to the windshield wiper system of the vehicle for controlling activation of the wiper based on the optical detection of obscuring moisture or precipitation on the windshield.
A principal object of the invention is to provide a method and apparatus for optically measuring the degree of obscuration caused by moisture or precipitation on an automotive windshield. Features of the invention are a point source of light for illuminating the windshield and an optical imager having a sparse detector array for sensing light imaged both on and off the optical axis of the imager. An advantage of the invention is automatic activation of the windshield wiper system at the optimum speed and/or frequency in response to changing rates of precipitation.
For a more complete understanding of the present invention and for further advantages thereof, the following Detailed Description of the Preferred Embodiments makes reference to the accompanying Drawings, in which FIG. 1 is a schematic diagram illustrating an optical system of the present invention for detecting obscuring moisture or precipitation on a windshield of an automotive vehicle.
Alternative embodiments of the windshield obscuration detecting system of the present invention are illustrated schematically in FIG. 1. The optical system includes a small light source 11 or 12 for illuminating a windshield 14 of an automotive vehicle. An optical imaging apparatus 16 is positioned for sensing light emitted from source 11 or 12. In one embodiment light source 11 and optical imager 16 are located on opposite sides of windshield 14, whereas in an alternative embodiment light source 12 is located on the same side as optical imager 16. Light for source 11 is transmitted through windshield 14 to optical imager 16, whereas in the alternative embodiment light from source 12 is reflected by windshield 14 to optical imager 16.
The light source and imager of the present invention may be positioned in convenient, out-of-the-way locations inside or outside the vehicle and on the same or different sides of the windshield. For clarity of explanation, but not limitation, the following detailed description is directed to the embodiment comprising light source 11 outside the vehicle and optical imager 16 on the other side of windshield 14 inside the vehicle. Light source 11, which may comprise an LED, laser diode, or other small light source, may be located in the vicinity of a windshield washer spray nozzle, for example. Optical imager 16 may be mounted out of view of the driver behind a rearview mirror (i.e., between windshield 14 and the rearview mirror), for example. An embodiment, such as light source 12 and optical imager 16, having both emitter and imager mounted inside the vehicle may prove to be easier to maintain in alignment and free of interfering dirt and dust.
As illustrated schematically in FIG. 1, light from source 11 is imaged by a lens 17 onto an imaging plane 18 of a detector array comprising a plurality of individual sensing elements 18a-18e. Lens 17 may comprise a conventional optical lens, a Fresnel lens, or a system of lenses, for example. Sensors 18a-18e may comprise photodetectors or IR sensors as are well known in the sensor art. Imaging plane 18 of the detector may comprise a sparse one or two dimensional array of sensors, such as 18a-18e. Typically, sensor array 18a-18e is connected to a readout multiplexer and microprocessor 20 as is also well known in the art.
In the absence of precipitation or other light scattering obscurations on windshield 14, light from source 11 is imaged on the center of the detector array, which is aligned with the optical axis of imager 16 (i.e., on a small area directly behind the optical center of lens 17), as illustrated by the lines of focus merging on central sensor 18c. When obscuring moisture or precipitation 15, such as water droplets, snow flakes, sleet, etc., is present on windshield 14, light from source 11 (or from source 12 in the reflective embodiment) is scattered sufficiently for portions of the light to be imaged off the optical axis of imager 16, as illustrated by the lines of focus merging on sensors 18a and 18e. Thus, a small number of sensors 18a-18e placed on and at varying distances from the optical axis can determine the light intensity on image plane 18 as a function of the distance from the optical axis. The minimum number of individual sensors required for operation of the present invention is two, one on the optical axis and one off the optical axis. Additional sensors, such as sensors 18a-18e, provide more data for microprocessor 20 to perform sophisticated sensing and measuring functions. The relative intensities of the light imaged on-axis and off-axis at plane 18, and the distance of the imaged light from the optical axis, are functions of the type and amount of light obscuring (or distorting) moisture or precipitation 15 present on windshield 14. For example, condensation (or "fog") on the inside surface of windshield 14 would scatter light off the optical axis somewhat less than larger rain droplets 15 on the outside of windshield 14. Therefore, optical imager 16 would be able to discriminate between different types and amounts of light scattering moisture and precipitation on windshield 14.
The system of the present invention is distinctly different from systems that simply measure the amount of light scattered from windshield 14 without using an imaging system. Such direct scattering measurements would respond equally to many sources of stray or scattered light in addition to precipitation, even those that would not obscure visibility. Optical imager 16 of the present invention detects and measures the spatial distribution of scattered light, thus enabling a determination of the degree of windshield obscuration. The imaging system of the present invention provides a high signal-to-noise ratio by directly collecting light from source 11, more closely replicates the imaging process that occurs in the driver'"'"'s vision, and is less prone to false detection than known alternative systems.
To further improve discrimination of light from source 11, source 11 and optical imager 16 may be designed to emit and detect a specific, narrow wavelength of radiation, which may also be pulsed at a known rate to separate and identify it from other sources. These variations in the basic imaging system of the present invention are believed to be well within the ability of one having ordinary skill in the art of optical emitters and detectors.
Microprocessor 20 of optical imager 16 may be connected, for example, to the vehicle'"'"'s windshield wiper actuation system 22 and/or to a window defroster or defogger system 24, which may comprise a hot air blower or electrical heating grid, for example. In its most basic operating mode, the system of the present invention provides a signal to wiper system 22 to activate a sweep of the wipers upon detection of precipitation 15 at some threshold level of windshield obscuration. Thus, in an intermittent operating mode, optical imager 16 would either actuate a wiper sweep or not depending on the presence or absence of obscuring moisture or precipitation 15. This mode of operation would automatically adjust the wiper sweep rate (i.e., frequency of activation) to match changing rates of precipitation. Microprocessor 20 could include logic circuitry, as is well known, that would provide for varying the actual wiper speed as well as the frequency of activation. The threshold level of windshield obscuration for wiper activation could be preset, or it could be a value determined (and stored in temporary memory, for example) upon manual wiper activation by the driver. In addition, logic circuitry would be able to determine the presence of condensation or frost based on the spatial distribution of the scattered light detected at plane 18 and activate window defroster or defogger system 24 as necessary.
Although the present invention has been described with respect to specific embodiments thereof, various changes and modifications can be carried out by those skilled in the art without departing from the scope of the invention. Therefore, it is intended that the present invention encompass such changes and modifications as fall within the scope of the appended claims.