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Views: (708) Date: (20-03-10) Time: (00:00:02) |
Description: This video sequence shows the output of a ball detecting and tracking system, which is designed to evaluate table tennis service. The top pane shows the frame that is being processed. The yellow square box indicates the region of interest (ROI), which is the area the algorithm predicts where the ball is. If a ball is found, it will be marked by a red circle and its centre will be marked by a cross. The bottom three panes show the processing details. The left pane shows an enlarged binarised version of the ROI, where ball candidates are indicated by white objects. The middle pane shows the ball candidate that is being processed. The detection algorithm evaluates each ball candidate by checking its roundness, rounded upper contour (red) and size etc. The blue circle and cross are the predicted ball contour and centre respectively. Finally the right panes shows a plot of the y location of the ball versus the frame number. The plot can be used to measure the ball rise of a service. For more information about this project and the associated publications, please visit: www.xgmt.open.ac.uk
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