Instituto Geral de Perícias de Santa Catarina, Rua Pastor William Richard Schisler Filho, 590 - Bairro Itacorubi, Florianópolis, SC, Brazil(1).
Forensic Sci Int. 2020 May;310:110229. doi: 10.1016/j.forsciint.2020.110229. Epub 2020 Feb 29.
Speed estimation by video analysis has been an increasingly common method for obtaining the speed of vehicles involved in traffic accidents. Generally, the estimate is based on reference measurements obtained on site or on measurements calculated by photogrammetric techniques. In this work, we proposed an alternative method for estimating the speed of a vehicle with longitudinal trajectory relative to the camera, either approaching it or moving away from it. The method uses the "image scale factor in pixels" to calculate the distance from the vehicle to the camera in different video frames, thus allowing the estimation of a vehicle's average speed. The results were verified by means of a simulation, with a vehicle moving at known speeds. The small deviation obtained supports the forensic use of the method in speed estimation by video analysis.
视频分析的速度估计已经成为获取交通事故中车辆速度的一种越来越常见的方法。通常，估计是基于现场获得的参考测量值或通过摄影测量技术计算得出的测量值。在这项工作中，我们提出了一种估计具有相对于相机的纵向轨迹的车辆速度的替代方法，无论是接近相机还是远离相机。该方法使用“图像像素比例因子”来计算不同视频帧中车辆到相机的距离，从而可以估计车辆的平均速度。通过对以已知速度行驶的车辆进行模拟来验证结果。得到的小偏差支持了该方法在视频分析速度估计中的法医应用。
