THE VIDEO-BASED VERIFICATION SYSTEM FOR THE BALL-LINE EVENTS FOR THE REFEREES OF THE NETBALL MATCHES

摘要

In the video-based verification system for the ball-line events for the referees of the netball matches equipped with the cameras as well as image processing equipment, first of all the positions of the ball in relation to the playground border line are calculated with the use of the Otsu algorithm (Module 3), as well as the image thresholds and its segmentation, and subsequently, on the basis of this algorithm, the resulting image is processed with the use of the computer with the Hough transformation for a line and a circle implemented (Module 4); afterwards the result of these calculations generates the final graphical image divided into two sections and presenting the real picture of the ball hitting the playground near the border line and displaying the image on the referees' screen, whilst all these actions are done in real time during the match break.