【Key words】 single-point laser triangulation； lens distortion； sub-pixel location； piecewise linear approximation；
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The location precision is improved to 1/3 pixel by performing sub - pixel edge detection in fiducial satellite photo image.
采取对基准图卫片中特征进行亚像元精度特征定位的方法，可以将匹配精度提高到1／3个像素以内。
Based on the characteristics of short focus lens and CCD array, the necessity of sub-pixel imaging and location is analyzed.
该文首先从短焦距镜头和给定c CD成像阵列的成像特性出发，分析了实现亚像元成像与定位的必要性。
In the method, the automatic identification of feature area is fulfilled based on the edge attribute, and the sub-pixel center location is accomplished with the least-square approach.
方法中采用基于类椭圆边缘属性对特征区域进行自动识别，采用最小二乘椭圆拟合精确求取类椭圆亚像素定位中心。
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