The proposal of the scene description system of soccer

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  • サッカーにおけるシーン記述方式の提案

Abstract

We propose the system that describes a scene from the video sequences of a soccer game. The system detects the event by tracking a ball, and judges the play by tracking a player nearest the ball. Scene description is performed by the result of play judgment. Tracking a ball is performed by Template Matching. First, a background domain is removed using Subtraction between frames. And Template Matching is performed using the template of a ball prepared in advance on the images from which the background was removed. Then, the check of a ball position and the Calculation of a ball position in the camera that has not been detected are performed by using F-Matrix between cameras. When a ball was not able to be detected by the processing so far, the ball position was given manually.Detection of the event is performed by using the speed vector of a ball. Since it is thought that the speed vector of a ball is changing rapidly when the event has happened, an event is detected by computing the acceleration vector that is the rate of change of the speed vector of a ball and comparing that with the threshold.Tracking a player is performed when the event was detected. First, the pixel values of the images from which the background was removed are changed into binary values. And Labeling is performed on the binary images. Then the label nearest the ball position is tracked as a player. Tracking is performed by using the area of the label and the distance of labels between frames. At that time, the distance vector between a ball and a player, the difference of the distance vector between frames, and the color information of a player are calculated as an amount of the features.The play judgment is performed by using an amount of the features that are obtained in tracking a player. First, the team of a player is judged by using the color information of a player. In order to avoid the influence of brightness, HSL-transform is performed. Second, the play is distinguished to Kick or Heading by using the position relation between a ball and a player. Third, the play is distinguished to Keep or Release by using the amount of change of the distance between a ball and a player. Fourth, when the play is judged to be release, the play is distinguished to Clear,Shoot or Pass by using the team of a player and the direction of a ball. Finally, the play is determined by these processing.Then, Scene description is performed by play that is determined in the play judgment.We show the result of the detection of the event and play judgment.

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