Camera calibration method suitable for track and field distance measurement

Abstract

The invention discloses a camera calibration method suitable for track and field distance measurement, and belongs to the field of training and match referees of sports track and field projects. By adopting the method, no calibration object needs to be arranged on site, and equipment and a measurement method for track and field distance measurement are used for calibration. For the distance measurement of a shot, a shot throwing method is used, a trace is formed at a landing point, and then a tape measure is used for measuring the throwing distance (the height needs to be measured at the same time). The operation is carried out for several times, physical coordinates of a landing point are measured and obtained, coordinates of a shot in a picture when the shot lands are obtained at the same time, and after a plurality of groups of data are obtained, calibration work of the camera can be completed by using a corresponding method. The whole method is simple and convenient and can be completed by a common user, and the use of a specific calibration object and a specific measurement method is avoided. And an object and a measurement method used for calibration are unified with an object and a measurement method used in actual use, so that the distance measurement precision in final use is greatly ensured.

Description

technical field [0001] The invention belongs to the field of sports track and field training and match refereeing, and in particular relates to a camera calibration method suitable for track and field distance measurement. Background technique [0002] In the training and competition of track and field throwing events (including javelin, hammer put, shot put, discus) and long jump events (including long jump and triple jump), it is necessary to accurately measure the distance of throwing and the distance of long jump. At present, the measurement of this type of distance mainly relies on manual methods. The measurement work is cumbersome, the efficiency is not high, and the measurement data is often inaccurate. In the javelin and hammer throws, the landing area is a dangerous area, and the measurement personnel need to improve Be vigilant, incidents of javelin and hammer injuries also occur from time to time. In order to solve the above problems, the invention patent of "A M...

AI Technical Summary

Problems solved by technology

These methods have the following common disadvantages: First, the calibration object and measurement method must be accurate, otherwise it will affect the accuracy of calibration

In practice, on the one hand, it is a difficult problem to accurately measure the physical coordinates of these calibration objects, and on the other hand, how to accurately locate these calibration objects in the photo is also a difficult problem; second, the calibration objects and measurement methods used for calibration It is separated from the target object and measurement method in actual use, and the characteristics of this separation will also affect the accuracy of final use

Taking the distance measurement of shot put throwing as an example, in actual use, on the one hand, the measurement of physical distance, according to the standards of the Athletic Federation, is based on the near point of the shot put landing mark. On the other hand, the coordinates of the shot put in the photo, Need to use a method to determine, the method used here is obviously not the same as the method used to determine the coordinates of the calibration object in the photo during calibration (because the characteristics of the two objects in the photo are different), this The characteristics of the separation of the calibration objects and measurement methods used in calibration from the target objects and measurement methods in actual use will affect the accuracy of final use

Third, in the existing camera calibration methods, the calibration process is a professional work that requires professional and technical personnel to complete, which is extremely inconvenient for users and a great limitation for users.

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