我可从来没有明白为什么交警只知道执行头盔规则。
I can never understand why the traffic police only know to enforce the helmet rule.
实验证明该方法能够自动执行头肩分割，人脸定位，简单快速而且有效。
The experimental results show that this approach can automatically perform head-shoulder segmentation and locate the facial region with efficient, simple and fast computation.
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