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文中提出的测量系统包括自动定点和人工交互式定点两部分。人工定点部分是一种基于小波多尺度分析的特征点自动提取方法。在不同分辨率的图像上 ,用Canny最佳滤波器 ,基于知识的跟踪、可变形模板等方法 ,得到高精度的轮廓线 ;然后根据特征点的几何定义 ,利用轮廓线的位置、曲率等信息自动提取特征点。对于图像质量差、自动定点无法完成或者精度不高的情况 ,可由人工交互式定点进行补充 ,从而形成一个完整的X线投影测量系统。
The measurement system proposed in this paper includes two parts: automatic fixed point and artificial interactive fixed point. Artificial fixed part is a feature extraction method based on wavelet multiscale analysis. On the images with different resolutions, we get the contour lines with Canny optimal filter, knowledge-based tracking and deformable templates, and then make use of the contour position, curvature and other information according to the geometrical definition of feature points Automatic extraction of feature points. For poor image quality, automatic point can not be completed or the accuracy is not high, the artificial interactive fixed point to be added to form a complete X-ray projection measurement system.