基于可变形模型的光条纹中心提取方法研究

Research on the Method for Extracting the Centre of Light Stripe Based on Deformable Model

精确提取光条纹中心是实现高精度线结构光视觉测量的关键。针对噪声和光条纹断线对提取精度的影响,提出了一种基于可变形模型的光条纹中心提取方法。模型采用可变形B样条曲线,在内能和图像势能的共同作用下发生变形逼近光条纹中心。用有限元法对模型进行求解,在内能和图像势能总能量极小时,获得准确的光条纹中心。理论分析表明,该方法可实现光条纹中心的亚像素级提取。

Accurately extracting the centre of light stripe is the key of high precision linearstructured light video measurement. A new method based on deformable model was proposed with ai ming at the influence of noise and broken lines. The model, that is a deformable B--spline curve,is deformably operated by internal energy and external energy. The sub--pixel center of light stripe can be found when energy is minimized by FEM. The proposed approach extracts strips central points at subpixel accuracy successfully.