Method for obtaining vehicle speed accurately with video mode

Abstract

The invention discloses a method for precisely obtaining vehicle speed by video, which is essentially characterized in that: 1. a measuring vidicon is needed to be arranged right above driveways to be measured; 2. road surface is needed to be treated, which comprises drawing a plurality of stripes that have the same direction with vehicle driving direction and drawing two horizontal marker lines at two ends of the stripes; a main unit continuously scans the stripes to obtain speed and scans the horizontal lines to obtain evidence whether arranging position offsets or not; 3. the invention also makes uses of a characteristic that time interval of video signals each time is the same and uses light filling measure.

Description

technical field [0001] The invention belongs to a method for video speed measurement in the field of intelligent transportation, and the method can improve the accuracy of video speed measurement. Background technique [0002] In the field of intelligent transportation, how to accurately measure the measurement speed in motion has always been the focus of research by scientific and technological workers. According to different measurement principles, there are currently several measurement methods: 1. Trigger coil speed measurement; 2. Microwave speed measurement; 3. Laser speed measurement ; 4. Video speed measurement. [0003] The principle of coil speed measurement is based on the principle of electromagnetic induction, that is, two coils are buried on the road surface. As a large conductor, the vehicle passing through the coil will have a greater impact on the magnetic field of the coil, thereby affecting the current flowing through the coil. By detecting this change (t...

AI Technical Summary

Problems solved by technology

[0007] Through the above analysis, video speed measurement is the most advanced measurement method, but there are two main problems in current video measurement, which easily lead to missing vehicles and large speed measurement errors

[0008] 1. Since the video speed measurement is mainly analyzed based on the image, and the image is an outdoor all-weather image, the image changes greatly under different time and weather conditions, and sometimes the background does not change enough when there are cars and no cars. Lead to misjudgment; sometimes due to the sudden appearance of shadows (clouds), it is judged that there is a car passing by;

[0009] 2. Because the camera is installed outdoors, the fixed position may be shifted after being exposed to wind and rain, and whether the position is up, down, left, or right, it will have a fatal impact on the video speed measurement, resulting in a huge speed measurement error

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