Video speed measuring method based on feature point change

A feature point, video technology, applied in the re-radiation of electromagnetic waves, radio wave measurement systems, traffic control systems for road vehicles, etc. Effect

Active Publication Date: 2013-07-10
SHANGHAI SEARI INTELLIGENT SYST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Both of the above two test methods need to add corresponding equipment to realize the speed measurement, which increases the complexity of the equipment to a certain extent and increases the system cost

Method used

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  • Video speed measuring method based on feature point change
  • Video speed measuring method based on feature point change
  • Video speed measuring method based on feature point change

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Embodiment Construction

[0016] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0017] The invention provides a method for measuring video speed based on feature point changes, the steps of which are as follows:

[0018] Step 1. The camera or video camera used as a video probe takes continuous pictures or videos of a certain road at fixed time intervals. When a moving object enters the scene captured by the video probe, the easily identifiable features of the moving object are detected. identify. When the moving object is a car, the feature can be selected as a license plate or logo light or a road projection of the vehicle in the captured picture or video. Extract the feature on the currently captured picture or the current video frame. The feature extraction method can be realized by using the existing image feature extraction method. After the feature extraction, the diagonal coordinates of the extracted ...

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Abstract

The invention relates to a video speed measuring method based on feature point change. The video speed measuring method based on the feature point change is characterized by comprising the steps that a video probe is used for shooting continuous photos of a certain road at fixed time intervals or continuously shooting videos of the certain road, when a moving object enters a scene shot by the video probe, features of the moving object are extracted, and the speed of the moving object is calculated through displacement amount change of steps. According to the video speed measuring method based on the feature point change, an existing video probe is used for collecting continuous photos or video streaming, length calculation is conducted to pixel changing amount of feature points in the continuous photos or the video streaming, the speed of a measured object can be obtained by the fact that time difference is further divided, the addition of additional equipment is needless, a system is simple, and cost is low.

Description

technical field [0001] The invention relates to a video speed measurement method, in particular to a video speed measurement method based on feature point changes, and belongs to the technical field of vehicle speed measurement methods. Background technique [0002] At present, vehicle speed measurement technologies mainly include ground sensing coil speed measurement (or infrared speed measurement) and radar speed measurement (or laser speed measurement). The ground induction coil speed measurement technology uses the principle of electromagnetic induction. When a vehicle passes by the ground induction coil area, the magnetic flux of the coil changes, and a trigger signal is output to indicate that there is a vehicle passing by. Therefore, two ground induction coil areas can be set at a certain distance on the road surface. The speed of the vehicle can be calculated by monitoring the time difference between the vehicles passing through these two areas. Since the ground ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/68G06T7/20G08G1/052
Inventor 张东海王成龙陈华史贝娜巢国平
Owner SHANGHAI SEARI INTELLIGENT SYST CO LTD
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