平面曲线的关键点检测可用于数字曲线的直线段逼近，因此在很多图像识别、测量及分析的场合均有重要应用。
Critical point detection (CPD) of planar curves can be well applied in approaching of curves using poly lines, which has very important applications in image recognition, measurement and analysis.
实验表明所提算法计算消耗小，检测精度高，并能提供直线段的完整描述。
Experimental results demonstrate that the proposed algorithm has small computational requirements, high detection accuracy, and the capability of providing complete line segment description.
通过分析和编程试验证明了其算法对直线段的检测有效。
Through analysis and programming test, the novel edge line detection method is effective.
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