【摘要】 双镜头双探测器拼接式航空摄影相机获取的是双中心投影影像,需要将其转换成等效单中心投影虚拟影像并控制其转换精度。文章对双镜头相机建立由双中心投影向等效单中心投影转换的数学模型,依据模型得出投影转换误差的影响因素,并采用蒙特卡罗方法与最大误差方法对投影转换误差进行MATLAB仿真,利用仿真结果分析总体误差分布与各误差源的影响效果,为误差源的范围限制提供参考。结果表明:对于参数特定的双镜头航空相机,当主点误差限为0.5像元,主距误差限为1像元,相对角元素误差限为10″,相对线元素误差限为1mm,相对航高误差限为150m时,投影转换误差可控制在2像元内,且相对角元素误差为主要误差源。更多还原

【Abstract】 It is a double-center projection image that an aerial photographic camera with double-lens and double-sensors obtains. It is necessary to convert them to an equivalent single-center projection virtual image and control the conversion accuracy. This paper establishes a mathematical model of the conversion from double-center projection to equivalent single-center projection for adual-lens aerial camera. According to the model, the influence factors of projective conversion error are obtained. It also simulates the projective conversion error with MATLAB by methods of Monte Carlo and maximum error, analyzes general error distribution and consequence of each error source by utilizing the simulation result, and providing reference for the limits of error sources. The results show that for a dual-lens aerial camera with specified parameters, the projective conversion error could be controlled within 2 pixel if the error margin of principal points is 0.5 pixel, focus distances 1 pixel, relative angle elements 10″, relative line elements 1mm and relative flight height 150 m, among which the relative angle element error is the major error source.更多还原