为满足高精度线阵CCD二维自准直仪动态高精度测量,提出一种高精度线阵CCD二维自准直仪四狭缝目标中心的定位方法,首先采用高斯滤波对CCD图像进行平滑处理,在抑制噪声的同时生成带有高斯加权的CCD图像,然后采用线性插值质心法对加权图像进行目标中心亚像素定位.实验结果表明,该定位方法稳定性好,定位精度高且实时性强,在原理样机上,应用该方法实现了单次二维角度测量时间小于0.2 s,测量范围±900″,在±300″内相对于进口ELCOMAT3000示值误差优于±0.5″,具备工程应用价值.%To realize the dynamic high-accuracy measurement of high-accuracy linear array CCD 2-axis autocollimator, a high-accuracy location method for 4-reticle target center of high-accuracy linear array CCD autocollimator is proposed. First, CCD images are processed with Gauss-filter, which diminishes the noise and generates weighted images. Then, the sub-pixel location of weighted image's target center is acquired accurately by using barycentre method based on linear polynomial interpolation.Experimental results show that the proposed method is stable and accurate. Appling the method on the prototype, as a result, the measuring time of a single 2-axis angle measurement is less than 0.2s. The measure scope is±900″. The proposed method can efficiently fulfill the requirements in engineering systems.
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