Slab calibration system used in athletic contest measurement

Abstract

A flat-panel calibration system used in the measurement of sports competitions. The system adopts a plane graphics calibration method. The plane calibration method is to use multiple imaging planes to analyze the position of the target, and select the appropriate imaging plane to determine the position of the target. The first step is to use two left and right cameras with different orientations to shoot and obtain images of the calibration object and the object to be calibrated; the second step is to process the images obtained by the left and right cameras, extract and match the feature points, and then Obtain the internal and external parameters of the camera; the third step is to use the measurement principles of the two methods to calculate the information of the calibrated object in the three-dimensional space through the feature points and the internal and external parameters of the camera. A comparative experiment was carried out between the traditional calibration method and the planar checkerboard calibration method. Compared with the traditional three-dimensional frame calibration method, the planar checkerboard calibration method has higher accuracy and smaller relative error.

Description

Technical field [0001] The invention relates to a camera three-dimensional space calibration applied in sports competitions, belongs to the field of sports field measurement research, and particularly relates to a three-dimensional camera portable calibration system in sports. Background technique [0002] Video analysis is a commonly used research method in sports scientific research. Through the analysis of sports technology images, the kinematic parameters of athletes during competition can be obtained more realistically without affecting normal competition and training. Accurate three-dimensional calibration of the camera is the prerequisite for video analysis. At present, in the field of sports biomechanics research at home and abroad, the current calibration method in the field of sports science research is the traditional camera calibration based on the three-dimensional radial frame, and then the calibrated two-dimensional data undergoes direct linear transformation (Dire...

AI Technical Summary

Problems solved by technology

[0005] First of all, the calibration range of the actual measurement is limited, and it is impossible to effectively calibrate large-scale sports events, and sometimes it is impossible to measure due to the particularity of the shooting location of the competition scene; secondly, as the use time increases, the frame will be deformed due to its own deformation and other reasons This leads to an increase in measurement error; again, this kind of frame is relatively heavy and inconvenient to carry, and it takes time and effort to install it at the sports competition site; finally, it is necessary to manually identify the marking points of the frame during calibration, which will greatly increase the cost of calibration. time

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