An approach to extract feature points on the boundary based on length of arc is proposed in view of the key problem of measuring composite-shape parts.

针对组合形状零件几何尺寸测量中的关键问题—轮廓识别，提出了一种基于弧长的轮廓特征点提取的方法。

youdao

So, the next concept that I want to define is that of arc length.

接下来我想介绍一下弧长。

youdao

And, what it does is it actually integrates the speed of the time to give you the arc length along the trajectory of the car.

对速度做积分,告诉你车在轨道上走的弧长。

youdao

He piggybacks this unit directly on top of a scope, allowing him to produce never-before-captured wide-field images, like his striking, ghostly picture of Barnard's Loop-a huge arc of gas that covers the length of the constellation Orion.

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