چكيده به لاتين
Abstract
Today, the sport of volleyball is one of the most exciting sports in the world. The serve is one of the most important events for the volleyball game. The serve with the start of the game to obtain a score is one of the most important parts of the game.
A good serve makes provision for the opposing team weak attack can be a score for the team ball owner points.
1. (Jump Serve) the kind of serve that the player jumps into the air and as a striker to hit the ball.
2. (Jump Float Serve) the kind of Float serve the player when hitting jumps to the top.
For the implementation use the Olympic Volleyball Tournaments videos broadcast in London. In order to identify the serve type volleyball player movements can be considered that this involves the extraction of the player. To extract the players use Time frame difference.
Because broadcasting is selected video camera is moving. To remove this move, Homography matrix between the two frames are calculated and then based on those match two images. After matching images, the difference is calculated, which causes moving objects to appear.
Since the time of serve, major motion serve player things can check the area behind the serve line, find the player. This work continues and the player until they are close to the line of serve with the provinces and import movements with respect to the actual coordinates are extracted.
At the end of this movement is derived features that are used to diagnose the type of serve.
To identify the success of passing the ball from the top of the net, like the above frames match on each other and then difference will be apparent this ball location. This track without time interval from the moment the player to hit the ball until the ball passes over the net or the net done deal.
Results indicate the type of service detection accuracy of these methods is above 87 percent. The results of the proposed method in the first place the ball detection, tracking and successfully pass it on top of the net is 84 percent.
