Image shooting moment determining method and system as well as vehicle speed detection method and system

An image capturing and determining method technology, applied in traffic control systems, traffic control systems for road vehicles, instruments, etc., can solve the problem that surveillance cameras cannot accurately know the image capturing time, and achieve the effect of improving accuracy
CN104575006AActive Publication Date: 2015-04-29BEIJING LUSTER LIGHTTECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING LUSTER LIGHTTECH
Publication Date
2015-04-29

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Abstract

The invention provides an image shooting moment determining method and system. The method comprises the following steps: low-precision moment information and a pulse per second signal are acquired from a Beidou time service module, wherein the low-precision moment information takes integral second as the minimum precision; the shooting frame rate of a monitoring camera is acquired so as to obtain an exposure trigger sequence corresponding to the shooting frame rate; the pulse per second signal is taken as a first exposure trigger signal of the exposure trigger sequence according to the shooting frame rate, and the monitoring camera is controlled for the first exposure; follow-up exposure is implemented sequentially by an exposure controller of the monitoring camera according to the exposure trigger sequence; and the shooting moment of each image corresponding to the exposure trigger sequence is calculated according to the low-precision moment information and the shooting frame rate. The invention further provides a vehicle speed detection method and system. With adoption of the scheme, the problem that the monitoring camera cannot acquire the image shooting moment accurately can be solved, and the vehicle traveling speed monitoring precision can be improved.
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Description

technical field

[0001] The present invention relates to the technical field of image acquisition, and more specifically, to a method and system for determining an image shooting time, and a vehicle speed detection method and system. Background technique

[0002] As traffic becomes more and more developed, there are more and more vehicles on the road. In order to regulate safe driving and understand real-time road conditions, it is particularly necessary to monitor vehicles on the road.

[0003] At present, image monitoring is one of the more common monitoring measures. In the actual image monitoring process, monitoring cameras are usually arranged at different positions on the road, and images of vehicle driving conditions are obtained through the shooting of monitoring cameras, and then calculated according to the time interval between two images and the distance of the vehicle in the image. out of the vehicle speed. For the same monitoring camera, the shooting time of e...

Claims

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