柱面数（Cylinders），是指硬盘多个盘片上相同磁道的组合，盘片上的同心圆（磁道）圈数即是柱面数。
对模拟影像及实际航空遥感影像进行仿真，结果表明：改进后的三棱柱面法较好地保留了遥感影像的分形特性，计算的分形维数也更为准确。
The simulation results with real aviation remote sensing image show that the improved method effectively keeps the image fractal features and can obtain more accurate fractal dimension.
本文用时间序列谱分析的方法对圆柱面的棱数进行精确判定。
In this paper, the time series spectral analysis is applied to accurate measurement of the number of edges on cylinder surface.
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