Measurement Method for Complex Shape of Hydraulic Turbine Blade Using Binocular Vision

In industrial practices, there are lots of parts or components with complex shape, such as hydraulic blade, propeller, etc. Thus, rapid measurement for those parts or components will affect the production cycle and cost greatly. In this paper, we introduce the binocular vision to measure the hydraulic blade. First, the camera calibration is conducted to calculate intrinsic and external camera parameters, and two images are obtained from different views. Then, the stereo matching is discussed in detail, such as feature extraction, detection, constraints and so on. Thirdly, we reconstruct the geometric model based on above analysis using NURBS. This method is a non-contact method, which can improve the measurement efficiency and enhance measurement flexibility.