【摘要】 针对无衍射激光图像特点,提出了一种由亮环确定图像中心的方法。利用局域亮度最大原理,提取亮环屋脊边缘点;对各个亮环边缘点用最小二乘法拟合圆心,取拟合残差最小的亮环的圆心作为整幅图像中心。该方法运算速度快,对图像无需二值处理,避免了阈值选取不当对图像边缘位置的影响,可以自适应地利用周围像素亮度值来确定图像边缘。该方法已应用到船舶的同轴度检测,获得了很好的结果。更多还原

【Abstract】 Based on the features of the non-diffracting laser image,a method to center an image by bright ring is proposed.The edge points of a bright ring are detected based on the maximum of intensity in a local region,and they are fitted into a circle by the least square method.The laser image center is the circle centre with minimum fitting errors.This method is faster in calculation and avoids errors from the incorrect selection of threshold and is self-adopting to the situation of local image for image edge detection.The method was used in inspection of coaxial shaft of ships and got satisfied results.更多还原