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A 64-bit quadratic approximation of an orthorectification algorithm

机译:正整算法的64位二次逼近

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Aerial image orthorectification is a useful tool that is currently being applied to many applications. However, orthorectification is a computationally complex algorithm that requires parallelization, interpolation, and divisions. When dealing with onboard processing of aerial imagery for real-time feedback, another constraint arises, power consumption. Field Programmable Gate Arrays (FPGAs) are a low power solution, however, FPGAs are limited to fixed-point processing. This paper develops and describes a fixed-point integer orthorectification algorithm that uses a quadratic approximation for the division inherent in the orthorectification algorithm. The new algorithm is then applied to aerial data and compared to the floating-point version using 64-bit data types. The results show an increase in computational speed of over 2× and a mean projected pixel position difference of 2% of a pixel size over the floating point algorithm.
机译:航空影像正射校正是一种有用的工具,目前正应用于许多应用程序。但是,正射校正是一种计算复杂的算法,需要并行化,内插和除法。当处理航空图像的机载处理以进行实时反馈时,会出现另一个限制,即功耗。现场可编程门阵列(FPGA)是一种低功耗解决方案,但是,FPGA仅限于定点处理。本文开发并描述了一种定点整数正交校正算法,该算法对正交​​校正算法固有的除法使用二次逼近。然后将新算法应用于航空数据,并使用64位数据类型将其与浮点版本进行比较。结果表明,与浮点算法相比,计算速度提高了2倍以上,平均投影像素位置差为像素大小的2%。

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