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在学校运动会中,即便从教多年的专职体育教师对于短跑项目名次的判定及成绩的准确性(手计时)也存在困惑。而现实中,计时员又多为其他科教师,常会出现注意力不集中、反应时不同步等情况而造成开表不能同步进行。笔者发现运用视频软件中的逐帧播放功能,不但可以在有争议时,准确地还原出所有道次运动员到达终点的名次和成绩,而且误差较低,如操作熟练还可以节省人力(省掉终点计时裁判,一般情况下不赞成完全脱离手动计时而单独使用)。一、原理每台摄像机在拍摄时都会记录相对应的时间,每秒的帧数也是固定的,即拍摄多
In school games, there is confusion in judging the sprint ranking and the accuracy of the scores (hand timing) even after years of full-time physical education teachers. In reality, many other timekeepers and other teachers, often appear inattentive, such as the reaction does not synchronize the open table can not be synchronized. The author finds that using the frame-by-frame playback function in the video software not only can accurately restore the rankings and grades of the athletes reaching the finish line at the time of dispute, but also has lower error, and can also save manpower if the operation is proficient Timing referee, under normal circumstances do not agree completely out of manual timing and used alone). First, the principle Each camera will record when shooting the corresponding time, the number of frames per second is fixed, that is, shoot more