As an important part of comprehensive student quality, the accurate assessment of physical fitness is helpful to promote the reform of educational evaluation. The traditional methods of physical fitness evaluation mostly rely on manual experience, which often leads to problems such as lagging results and difficult large-scale application. To solve the above problems, this paper proposes an automatic physical fitness assessment model for students that integrates text and video information. Firstly, the model establishes the connotation and index dimension of physical fitness through literature analysis and expert scoring method. Secondly, in order to solve the problems of complex assessment environment and subject confusion in the open environment, the plug-and-play bi-directional feature enhancement approach for moving object detection is proposed, text features are introduced to eliminate the ambiguity of visual features, and the region sequence of assessment subjects is accurately deduced. Finally, based on the action recognition network, the valid frame sequence was obtained by filtering the invalid frame sequence of the subject area, and the computable metrics of physical fitness was calculated by analyzing the changes of skeletal keypoints, and the physical fitness score was obtained. Tests on the self-constructed data set of physical fitness automatic assessment show that the combined text and video automatic physical fitness assessment model processes 1 minute video in 2.6 s, and the average accuracy is 91.22%. The model has been applied to the physical fitness assessment of 2.8 million students with good accuracy and robustness.
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