How it Flies and Why it Flies? Volleyball Trajectory Segmentation and Classification

Chen Ni Chen, Wei Ta Chu

Research output: Contribution to journalArticlepeer-review


Analyzing volleyball videos based on 3D ball trajectories was relatively overlooked before. In this brief, we focus on how ball trajectories can benefit volleyball video analysis. Based on videos captured by two cameras from different viewpoints, we detect the volleyball and construct 3D ball trajectories. We then propose a trajectory segmentation and classification method based on BERT (Bidirectional Encoder Representation for Transformer). The volleyball at each frame can be categorized into one of six trajectory classes, e.g., serve and attack, and a long ball trajectory showing the ball being hit back and forth is appropriately segmented. We believe that this is a very first study adopting the language model technique to analyze ball trajectories, and results of trajectory segmentation and classification can enable more advanced volleyball analysis.

Original languageEnglish
Article number9381394
Pages (from-to)1591-1595
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number5
Publication statusPublished - 2021 May

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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