小车到交通灯的距离是通过单个Pi 摄像头测量的，需要 camera calibration 想了解camera calibration的系列，请访问OpenCv-Python Tutorial

想了解单眼视觉计算距离的细节，请访问Vehicle Distance Measurement based on Monocular Vision - Xu Guoyan, Wang Chuanrong, Gao feng, & Wang Jiangfeng (September, 2009)

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The distance to stop sign and traffic light is measured by using a single Pi camera, camera calibration is needed.

For more detail in camera calibration, please refer to OpenCv-Python Tutorial

For more detail in calculating distance using monocular vision, please refer to Vehicle Distance Measurement based on Monocular Vision - Xu Guoyan, Wang Chuanrong, Gao feng, & Wang Jiangfeng (September, 2009)