用于基于广播的空间足球分析的免训练屏幕外球员插补
Training-Free Off-Screen Player Imputation for Broadcast-Based Spatial Football Analytics
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中文总结 AI 辅助
研究针对广播中球员位置数据不全问题，通过模拟视口量化失真，评估免训练在线插补基线，最佳的基于角色的质心投票可减半隐藏区域误差，集成后提升控球质量得分，翻转部分判定类别。
中文摘要 AI 辅助
空间足球指标如球场控制假设能获取所有22名球员的位置，但广播主摄像机这一最广泛可用的位置数据源在任何时刻仅显示10 - 16名球员。我们用一个开放、可重现的基准量化由此产生的失真：将模拟广播视口应用于开放的全球场跟踪数据。忽略屏幕外球员会使隐藏区域的球场控制误差在三场比赛中膨胀至25.1 - 26.9个百分点，平均绝对控制份额误差为11.1 - 13.4分。然后评估一系列仅使用正在分析比赛中的观测值的免训练在线插补基线。最佳的基于角色的质心投票大致将隐藏区域误差减半（至12.2 - 13.8分），并在所有三场比赛中，在36米至60米的每个视口宽度下，将控制份额误差降至忽略策略的28 - 48%。在集成到广播视频GSR管道后，插补在两个世界杯广播窗口使下游控球质量得分提高了15.6和17.2分，在一个窗口中翻转了判定类别。
英文摘要
Spatial football metrics such as pitch control assume access to the positions of all 22 players, yet the most widely available source of positional data -- the broadcast main camera -- shows only 10-16 of them at any moment. We quantify the resulting distortion with an open, reproducible benchmark: a simulated broadcast viewport applied to open full-pitch tracking data (Metrica Sports; three matches, one held out from method development). Ignoring off-screen players -- the visible-only baseline implied whenever a video-based game-state-reconstruction (GSR) pipeline adds no imputation layer -- inflates hidden-zone pitch-control error to 25.1-26.9 percentage points and a mean absolute control-share error of 11.1-13.4 points across the three matches. We then evaluate a ladder of training-free, online imputation baselines that use only observations from the match being analysed. The best overall on these decision-relevant metrics, role-anchored centroid voting (each visible player votes for the full-team centroid by subtracting its running role offset, attenuating the viewport-induced subset bias), roughly halves hidden-zone error (to 12.2-13.8 points) and cuts control-share error to 28-48% of the ignore policy at every viewport width from 36 m to 60 m in all three matches. For occlusions <=9.6 s -- the regime of the closest learned prior work -- it reaches binwise median position errors of 3.3-8.9 m; but 50-57% of hidden-player observations lie beyond that regime. Integrated end-to-end into a broadcast-video GSR pipeline, imputation moves a downstream possession-quality score (Space-Creation Index) by 15.6 and 17.2 points on two real World Cup broadcast windows, flipping the verdict class in one.
发表机构
- Independent researcher（独立研究者）
机构由 AI 辅助整理，请以论文原文为准。
