Safe driving assistance method and system based on change of license plate pixel height

Abstract

The invention discloses a safe driving assistance method and system based on change of license plate pixel height. The safe driving assistance method based on the change of the license plate pixel height comprises the steps that a camera is set to shoot images in front of a vehicle; the current speed Vt and the camera-to-vehicle head distance S2 of the own vehicle are collected; a license plate isidentified and the pixel height h of the current license plate is determined according to license plate images shot by the camera; the current vehicle distance D is determined, wherein the vehicle distance D is determined by the focal length f of the camera, the actual height H of a front license plate and the pixel height h of the license plate; a current safe distance S is determined, wherein the safe distance S is determined according to a driver reaction distance S0, a driver braking distance S1 and the camera-to-vehicle head distance S2; and the vehicle speed is controlled to ensure thatthe vehicle distance D is greater than the safe distance S. The driving strategy switching based on the change of the license plate pixel height is very suitable for controlling the vehicle speed infuture automatic driving, in particular to a driving speed control method for an automatic driving vehicle on an expressway in a lane.

Description

technical field [0001] The invention belongs to the technical field of transportation, in particular to the technical field of intelligent transportation, and in particular relates to a safe driving assistance method and system based on changes in the pixel height of a license plate. Background technique [0002] Urban road traffic is closely related to people's life and is an indispensable and important part of daily life. With the prosperity of the country and the rapid development of the national economy, especially the rapid development of the automobile manufacturing industry and the expansion of automobile ownership, mobility Vehicles have become an indispensable means of transportation in people's daily life. In recent years, the speed of expressway construction has increased by leaps and bounds. Drivers have shown a blowout growth. The number of non-professional drivers has increased. Due to the uneven technical level of drivers and different driving behaviors, the d...

AI Technical Summary

Problems solved by technology

[0004] Vehicle distance detection during driving is an important part of the early warning system. The current popular ranging methods mainly include radar ranging, ultrasonic ranging, laser ranging, etc., but these methods need to install a variety of devices, and the cost is relatively high. Complicated and not very good in real-time, it is not conducive to popularization and use in existing vehicles

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