Detection method for accumulated water and accumulated ice on road surface based on polarization measurement, and apparatus thereof

Abstract

The invention discloses a detection method for accumulated water and accumulated ice on a road surface based on a polarization measurement, and an apparatus thereof. The method is characterized in that: a polaroid is fixed in front of a CCD image sensor of a highway condition video camera, wherein the polaroid has a horizontal transmission direction; a TN liquid crystal is arranged in front of the polaroid and a control voltage electric circuit is arranged corresponding to the TN liquid crystal, wherein the control voltage electric circuit is provided for providing electric field for the TN liquid crystal; conditions of the accumulated water and the accumulated ice on the road surface are detected through a polarized light of reflected light of the road surface by using polarization characteristics of the light. According to the present invention, the apparatus can be directly applicable for the video cameras for network monitoring, and spreading use in the existing road testing video cameras, and has characteristics of simple refit, low cost, no influence on an original system, original monitoring network merging, stable work, wide detection range, exact detection and large application value.

Description

technical field [0001] The invention relates to optical detection, which is used for road surface state detection, and is a method and device for detecting road surface water and ice accumulation based on polarization measurement. Background technique [0002] Whether there is accumulated water and ice on the surface of the road has a great influence on safe transportation. Traditional road condition monitors use infrared rays or microwaves to detect road conditions based on the principle of different absorption rates on dry roads and icy and snowy roads. The sampling space is limited, and at the same time, the price is expensive. FUKUI and Junichi TAKAGI et al. proposed the method of using image processing (Hiroshi Fukui, Junichi Takagi, Yoshiro Murata and Masashi Takeuchi. An Image Processing Method To Detect Road Surface Condition Using Optical Spatial Frequency [J]. IEEEConference on Intelligent Transportation System, 1997: 1005-1009.), Using the maximum full width and ...

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Problems solved by technology

[0004] The problem to be solved by the present invention is: the detection range of the existing road surface water and ice accumulation detection is small, the detection device is expensive,

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