The semantic analysis can be focused on the playfield by the playfield detection.
球场区域检测可以将语义分析的重点放在球场之上；
Playfield detection algorithm is calculated from contractible image. The experimental results show that this method is of very high accuracy.
球场区域检测算法可以在缩略图上计算，实验结果证明该算法具有很高的准确性。
We propose a new algorithm for playfield color detection based on intrinsic image.
本文提出了一种基于本征图像的自动球场颜色检测算法。
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