Monocular Visual Analysis for Electronic Line Calling of Tennis Games

Electronic Line Calling (ELC) is an auxiliary referee system used for tennis matches based on binocular vision technology. While ELC has been widely used, there are still many problems, such as complex installation and maintenance, high cost etc. We propose a monocular technology method. The method the following steps: (1) locate ball’s trajectory. multistage ball positioning approach combining background subtraction color area filtering. (2) Then bouncing point prediction by minimizing fitting loss of uncertain point; (3) Finally, we find out whether bounds or not according to relative position between court side line in two-dimensional image.