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Vehicle queue length measurement method based on PTZ (Pan/Tilt/Zoom) camera fast calibration

A technology for camera calibration and queuing length, which is used in measurement devices, image analysis, image data processing, etc., to achieve the effects of good robustness, easy selection, and simple and convenient calibration methods.

Inactive Publication Date: 2013-01-09
HUNAN UNIV +1
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Problems solved by technology

[0009] In order to solve the above-mentioned technical problems existing in the existing vehicle queuing length measurement method, the present invention provides a vehicle queuing length measurement method based on PTZ camera rapid calibration

Method used

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  • Vehicle queue length measurement method based on PTZ (Pan/Tilt/Zoom) camera fast calibration
  • Vehicle queue length measurement method based on PTZ (Pan/Tilt/Zoom) camera fast calibration
  • Vehicle queue length measurement method based on PTZ (Pan/Tilt/Zoom) camera fast calibration

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Embodiment Construction

[0028] Measuring principle of the present invention is as follows:

[0029] (1) Select two traffic markings that intersect vertically to form a T-shaped calibration reference object, and measure the distance between two known collinear three points, and the vertical distance from a point outside the line to the line to obtain four feature points The pixel coordinates in the image, and then solve the internal and external parameters of the camera calibration, and establish the conversion relationship between the point coordinates in the world coordinate system and the pixel coordinates in the image coordinate system;

[0030] (2) Extract the image sequence in the monitoring video of the traffic scene, extract the texture features of the background image in the lane area, and establish the texture background image; set the interest domain of the lane in the image, extract the texture features of the lane interest domain in the real-time image, and The texture features of the cor...

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Abstract

The invention discloses a vehicle queue length measurement method based on PTZ (Pan / Tilt / Zoom) camera fast calibration. The vehicle queue length measurement method based on the PTZ camera fast calibration comprises the following steps of choosing two vertically-crossed traffic markings to form a T-shaped scaling reference and establishing a conversion relation between coordinates of pixels in an image and coordinates of roadway corresponding points in a world coordinate system according to the defined models of the image coordinate system and the world coordinate system; acquiring video images of a traffic monitoring scene by adopting a PTZ camera, setting an ROI (Region Of Interests) of a lane, detecting the vehicle queue state in the ROI by the adoption of an adaptive background update algorithm and textural features, and acquiring the pixels and pixel coordinates of the tails of the vehicle queues; converting the detected pixel coordinates of the tails of the vehicle queues into the world coordinate and finally computing the length of the vehicle queues. The tail position of the vehicle queues is judged according to the textural features, and the measurement of length of the vehicle queues is finished by the combination of the camera, so that the vehicle queue length measurement method based on the PTZ camera fast calibration, disclosed by the invention, has the advantages of low cost, strong embedded type, and the like.

Description

technical field [0001] The invention relates to a vehicle queuing length measurement method, in particular to a vehicle queuing length measurement method based on rapid calibration of a PTZ camera. Background technique [0002] With the rapid development of the economy, more and more cars are owned in cities, and traffic congestion has always been one of the problems in urban development. Intelligent transportation system is one of the effective ways to solve urban traffic congestion. At present, most traffic intersections in China adopt timing control of traffic lights, and the time length of traffic lights switching is fixed. Due to the complexity and randomness of traffic flow changes, the defects of this fixed allocation method are becoming more and more prominent. Therefore, research on the transition from fixed allocation time to intelligent time allocation has been gradually carried out. When the urban traffic signal command system performs intelligent time allocati...

Claims

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Application Information

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IPC IPC(8): G08G1/01G01B11/03G06T7/00
Inventor 李树涛贺科学
Owner HUNAN UNIV
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