Video-based water flow velocity detection method and system

The invention provides a video-based water flow velocity detection method. The video-based water flow velocity detection method has high environmental robustness, and is easy to implement. A water surface image is processed, water surface texture features are extracted and matched, the physical distance and the inter-frame time of feature points are calculated according to the camera imaging principle, the water surface flow velocity value is calculated, and it is proved through a large number of tests that the water surface flow velocity obtained through the method has reliability. 本发明提供了一种基于视频的水流速检测方法，基于视频的水流速检测方法具有良好的环境鲁棒性，易于实施，其通过对水面图像进行处理，提取水面纹理特征并进行匹配，根据相机成像原理计算出特征点的物理距离以及帧间时间，计算出水面流速值，经过大量试验证明，该方法所得到的水面流速具有可靠性。