This effect is called an "illusory contour.
这种效应叫“错觉轮廓”（illusory contour）。
The method of measuring globular indexing CAM contour with computer aid is introduced. effect of the CAM contour error on index error is analyzed.
介绍了在凸轮检测仪上应用计算机的辅助作用检测弧面分度凸轮廓面的方法，在此基础上介绍了误差分析方法。
The chain code was replaced by the shape signature and used to express the contour, improve the speed and decrease the effect of noise and transformation due to camera calibration.
在特征表示方面，用形状签名代替链码来描述轮廓，从而提高了计算速度，降低了由噪声干扰和镜头形变造成的影响。
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