A Measuring Method of Driving Speed ​​Based on Multi-scale Transformation

Abstract

The invention relates to a method for measuring driving speed based on multi-scale transformation, comprising: acquiring a driving video image signal through a CCD camera; selecting a video frame image A m*n , set a 3*3 template window area, and then the video frame image A m*n Traversal, the video frame image A m*n For the pixels in the middle template area, the pixel value of the middle pixel point is used to replace the original pixel value for multi-scale transformation; the current frame after multi-scale transformation is subtracted from the previous frame image after multi-scale transformation, and the corresponding pixel value is determined to be No change; Calculate the pixel center position of the changed area for the area where the pixel value has changed, solve the driving speed to determine whether it is driving in a straight line or changing lanes diagonally, and then calculate the driving speed. The present invention significantly improves the efficiency of speed measurement and the accuracy of vehicle speed measurement. The method greatly enhances the accuracy of traffic accident identification and overspeed judgment, and enhances user experience.

Description

Technical field [0001] The present invention relates to the field of speed measurement, and in particular to a driving speed measurement method based on multi-scale transformation. Background technique [0002] my country's traffic law has different regulations on highways, national roads, provincial roads, urban and rural roads, roads, and rain and snow in the weather. Suitable driving speed, it is safe driving, reducing traffic accidents and Protecting the driver's personal safety, improving the working conditions of the driver, etc.. The existing speed detection technique includes radar, infrared, ultrasound, ground coil, etc., microwave radar detection is widely used, but microwave radar detection equipment is expensive, high use process requirements; ground detection and maintenance is very difficult, video measurement Get extensive attention; how to reasonably calculate the driving speed, is an important research topic of speed testers. Today, how to quickly and accurately ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing video speed measurement method is outdated, the speed measurement is inaccurate, and the amount of calculation is large. It simply uses the frame difference method or the background subtraction method or the optical flow method for calculation. This method leads to a very large amount of calculation. Scale transformation is used to reduce the related speed measurement method of the calculation amount, and the existing calculation method leads to more calculation time and lower accuracy; and the calculation amount involved in the speed measurement in the prior art is very complicated, and most of the default cars are driving in a straight line , for the inaccurate measurement of the speed of vehicles changing lanes or driving diagonally, it has played a wrong role in determining the responsibility for accidents; distance, resulting in a very large amount of calculation and low calculation efficiency

Images