Method and device for calculating car distance and collision time

A technology of collision time and calculation method, applied in the field of intelligent transportation

Active Publication Date: 2019-03-29
广州鹰瞰信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the distance calculated entirely by the vehicle detection position in the image, the small hole imaging principle and the geometric ratio relationship will have a large error in practical application due to the un...

Method used

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  • Method and device for calculating car distance and collision time
  • Method and device for calculating car distance and collision time
  • Method and device for calculating car distance and collision time

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0037] Embodiments of the present invention provide a method for calculating vehicle distance and collision time, such as figure 1 shown, including:

[0038] S100. Image acquisition: acquire the image of the vehicle in front through the vehicle-mounted camera;

[0039] S200. Detection and tracking of the vehicle in front: by processing the image, the position information of the feature point of the vehicle in front is detected;

[0040] S300. Calculating the distance of the preceding vehicle: taking the location information of the characteristic points of the preceding v...

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Abstract

The invention relates to a method and device for calculating car distance and collision time with functions of improving car distance calculation accuracy and performing accurate real-time early warning. The method comprises the steps of image acquisition, wherein a vehicle-mounted camera of the own vehicle acquires an image of a front car; front car detection and tracking, wherein the image is processed, and position information of feature points of the front car is detected; front car distance calculation, wherein the position information of the feature points of the front car in a predetermined group is taken, the width of the front car and the car distance are calculated to obtain an average width value of the front car, and the car distance between the own car and the front car is corrected according to the average width value of the front car; front car collision early warning, wherein a relative car distance curve is acquired, real-time relative speed is obtained according to the car distance curve, collision time is calculated, the collision time is compared with an early warning threshold, and it is judged whether or not early warning is triggered; the relative car distance curve is obtained by fitting a Bezier spline, and the corrected car distance is taken as an input value of the Bezier spline.

Description

technical field [0001] The present application relates to the technical field of intelligent transportation, in particular to a method and device for calculating vehicle distance and collision time. Background technique [0002] Existing vehicle-mounted systems generally use vehicle-mounted radar to measure the distance of vehicles in front, or use ultrasonic sensors and radio frequency transmitters to detect the distance of front and rear obstacles, and calculate the collision time to issue collision warnings. However, such equipment is expensive and not easy to promote. [0003] There is also a vehicle ranging and collision warning based on monocular vision: a single camera collects the front image and runs the training sample method to detect the front target. The distance between the two vehicles is calculated according to the principle of small hole imaging and the geometric ratio, and the collision time is calculated in combination with the current speed of the vehicle...

Claims

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Application Information

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IPC IPC(8): B60Q9/00G06T7/60G06T7/246G06T7/73
CPCB60Q9/008G06T7/246G06T7/60G06T7/73G06T2207/10016G06T2207/30236G06T2207/30252
Inventor 俞兵华
Owner 广州鹰瞰信息科技有限公司
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