Rectangular pattern-based video image distance detecting method

A technology of distance detection and video image, which is applied in the fields of camera on-site calibration and establishment of video image distance detection model, which can solve problems such as difficult acquisition and error

Inactive Publication Date: 2012-07-18
SOUTHEAST UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the external parameters such as the installation angle of the camera are difficult to obtain in practice. If the measurement is carried out directly, the result will easily cause large errors.

Method used

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  • Rectangular pattern-based video image distance detecting method
  • Rectangular pattern-based video image distance detecting method
  • Rectangular pattern-based video image distance detecting method

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Embodiment Construction

[0080] specific implementation plan

[0081] The present invention is a video image distance detection method based on a rectangular pattern, and the specific steps are as follows:

[0082] Step 1. Initialize the device, take a video image through the camera, and obtain a single image;

[0083] Step 2. Record the optical center of the camera as point O 0 , mark O 0 The projected point in the road plane is point O. In the road plane within the shooting range of the camera, select a rectangular pattern, record the four vertices of the rectangular pattern clockwise as A, B, C, D, and record A, B, C The projection points of , D in a single image are A', B', C', D', where the midpoint A' of the single image is located at the upper left corner of the quadrilateral A'B'C'D', then the straight line A' B' intersects the straight line C'D' at a point, denoted as Q 1 ’, the straight line A’D’ intersects the straight line B’C’ at a point, denoted as Q 2 ’, the Y axis passes through t...

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Abstract

The invention provides a rectangular pattern-based video image distance detecting method. The method comprises the following main steps: 1, initializing; 2, establishing an actual rectangular coordinate system XOY; 3, measuring the actual side length of a rectangular pattern; 4, establishing an image rectangular coordinate system; 5, calculating the coordinates of the central point Q' of a singleimage; 6, calculating coordinates of a point Q1' and coordinates of a point Q2'; 7, calculating the scale factor of a video camera; 8, calculating the assembly height and angle of the video camera; 9, calculating parameters of a distance detection model; 10, implementing distance detection of the single image; and 11, converting the actual distance coordinates into image coordinates. In the rectangular pattern-based video image distance detecting method, the relative side length information of the actual rectangular pattern and the corresponding coordinate information of the actual rectangular pattern in the single image are directly utilized for video calibration and the establishment of the distance detection model for the first time, thereby solving the problem of video image distance detection.

Description

technical field [0001] The invention relates to the fields of computer vision, camera calibration and traffic video detection, and is a video image distance detection method based on a rectangular pattern, which is mainly used for on-site camera calibration and establishment of a video image distance detection model. Background technique [0002] As an important part of computer vision, camera calibration has been extensively studied. Camera calibration originated from photogrammetry. In the camera calibration model, generally speaking, the linear model is easy to calculate, the calculation speed is fast, and the analytical solution can be obtained, but it is difficult to fully express the aberration of the lens and the complex imaging process of the camera; while the nonlinear model can better simulate and compensate various Aberrations can improve the accuracy of the model, but the amount of calculation is large, and nonlinear optimization is often required, which reduces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 路小波刘阳
Owner SOUTHEAST UNIV
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