Research On Recognition Algorithm Of Human Body Over The Finish Line Based On Track Image

With the continuous improvement of athletes'competitive level in track race, track end-point timer system has become an essential device in major sporting events and it guarantees exact scores and fair plays.In most existing track end-point timer system, time spent by an athlete is acquired by the operation of umpires on pictures filmed at the finishing line manually. In this way unjust factors may be generated from the inaccurate judgment of umpires, besides, at a time when the game is proceeding rather rapidly, time costed by manual manipulation is indispensable. To solve these problems, this thesis made a research on recogniton algorithm of human body over the finish line. Main contents are as the following:First, timing principles of existing track end-point timer system is introduced and imaging mechanism of linear CCD used in the system is explained.To realize human object detection,an analyse is made concerning about the features of track images,based on which a method called object detection based on line median is proposed and compared with two other object detection methods.By connected components abstraction, background noise is removed and human object is extracted. Then the head image of each extracted target is located. According to the number of human head image, determine whether overlap or adhesion occurs in target images.In the case of overlap or adhesion, trunk skeleton of each human is extracted according to head positions. Two separation methods are proposed. Euclidean distance separation method is for light overlapping or adhesions. Floyd separation method is for crossing overlapping situation.Silhouette of each single human target is analyzed.Comparing with Distance Transform method, Poisson Equation method can acquire the main contour of human trunk.Based on Poisson Equation method, a feature extraction function is proposed, which can extract non-destructive and accurate trunk image.Based on this, the accurate competition results can be obtained.In the situation of no or light overlapping and adhesion, recogniton algorithm of human body over the finish line based on track image proposed in this paper can arrive at a accurate result.