摘要
自准直仪是比较常用的测角仪器,其原理是检测激光形成的图像光斑的中心之间的距离,通过2个中心的横纵坐标差来计算物体偏离的角度.利用迭代阈值和图像分割等方法将光斑图像进行预处理,然后将得到的图像分别用重心法、圆拟合法和匹配法进行中心定位,并最终进行偏离角度的测定.文中介绍了所使用的几种方法,并进行了仿真比较,结果表明,圆拟合法更有优势.
The autocollimator is a useful instrument to measure angles, and its working principle is to measure the distance between the centers of the laser spots. The angle of object departure is calculated based on the distance between two spots on horizontal and vertical axes. The methods of iterative threshold and image division are used to preprocess the spot image. Then after the preprecessing, detect the center by the methods of gravity model, circle fitting and image matching respectively, and finally detect the departure angle. The above methods are introduced and compared through simulation. The results show that circle fitting has more advantages.
出处
《应用科技》
CAS
2009年第8期21-24,共4页
Applied Science and Technology
关键词
重心法
圆拟合
迭代阈值
匹配
gravity model
circle fitting
iterative threshold
image matching
