... 近似测量法 approximation measurement method 近似等高线 approximate contour 近似地形面 telluroid ...
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approximate contour line 未精测等高线 ; 近似等高线
approximate contour lines 等高线概位
approximate depth contour 未精测的等深线 ; 近似等深线
And they are often distorted. First, a low passed filter is used to smooth the contour. And a polygon approximating method based on area error is used to approximate the contour.
鉴于这种情况，我们先使用低通滤波对轮廓曲线作光顺处理，随后再采用基于面积误差的多边形逼近法对曲线作逼近处理。
The paper develops general interpolation principals for parametric curves with constant feedrate, and contour error's approximate evaluations are discussed also.
阐述了参数曲线恒速插补的通用原理，同时讨论了轮廓误差近似计算方法。
At the same time, how to get the approximate road hollow position is solved to realize the road contour extraction by gradient vector flow model with iterative solution.
通过梯度矢量流模型迭代求解，解决道路凹陷位置逼近问题，最终实现道路提取。
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