摘要
激光三角测距系统的精度主要取决于光斑象在探测器上的定位，用CCD摄象机作为探测器时，光斑象的定位精度又取决于CCD摄象机的分辩率．通常用光斑的采样灰度质心作为象点的准确位置可将CCD的分辨率提高到亚象元级，但这种方法存在其固有的局限：边缘灰度跳变与高频干扰噪音影响．本文提出先用高次多项式拟合光斑灰度分布再用灰度质心来确定象点位置，很好地解决了上述的问题．最后用实验验证了该方法的精度（0.017）比灰度质心法的精度（0．15）提高了8倍．
The precision of laser triangulation system is mainly decided by the locating of image-spot on detector. The resolution of CCD limits the locating precision in laser triangulation measurement where CCD camera is used as detector. The method,using light-spot's sampling gray-center of mass to decide its accuracy situation,can improve the resolution of CCD to sub-image element. However,this method has its own limits lrim jamming of light-spot gray and high-frequency noise. In this paper,we discuss a practical method using gray-center of mass to locating light-spot after its gray distribution isfitted with multinomial,and it can overcome the above limits very well. At last, the result of experiments shows that this method can arise the resoltion of CCD camera to O. Ol7 picture element better than that (O. l5)of gray-center of mass.
出处
《光子学报》
EI
CAS
CSCD
1997年第11期998-1002,共5页
Acta Photonica Sinica
