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    • 60. 发明授权
    • Moisture sensor and windshield fog detector
    • 水分传感器和挡风玻璃雾探测器
    • US6097024A
    • 2000-08-01
    • US347093
    • 1999-07-02
    • Joseph S. StamJon H. BechtelJohn K. Roberts
    • Joseph S. StamJon H. BechtelJohn K. Roberts
    • G01N21/17B60S1/08B60S1/54G01N21/47H04N5/374
    • G06K9/00791B60S1/0822B60S1/0844B60S1/0885B60S1/0888G06T7/402H04N5/225B60S1/0833G06T2207/20056G06T2207/30252Y10S15/15Y10S318/02
    • A control system 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 on to an image array sensor, such as a CMOS active pixel sensor. The voltages of each of the pixels which represents the illumination level is converted to a corresponding gray scale value by an analog digital converter. The gray scale values corresponding to the image are stored in memory. 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. By providing a system for automatically detecting the presence of fog on the interior and exterior of the windshield, serious performance limitations of known automatic rain sensors are eliminated.
    • 一种用于自动检测车辆挡风玻璃上的水分的控制系统。 自动水分检测系统包括用于将挡风玻璃的一部分成像到诸如CMOS有源像素传感器的图像阵列传感器上的光学系统。 通过模拟数字转换器将表示照明电平的每个像素的电压转换成相应的灰度值。 与图像对应的灰度值存储在存储器中。 分析灰度值的空间频率组成以确定存在的雨量。 为了提供控制信号以根据存在的水分的量来控制车辆挡风玻璃刮水器的操作。 该系统还适用于在挡风玻璃的内部以及挡风玻璃的外部上检测雾的水平。 通过提供用于自动检测挡风玻璃内部和外部的雾的系统,消除了已知的自动雨水传感器的严重性能限制。