They can broadly divided into three categories: optical, electrical and physically contacting.
这些方法大概可以分为三类：电学方法、光学方法和物理接触方法。
Machine vision owes its rising popularity to one major factor: optical sensing is inherently clean, safe (because it a non-contacting technology) and very versatile.
机器视觉之所以能够快速普及的一个主要原因是：光学传感技术所固有的清洁、安全和通用性。
In terms of perspective projection transformation, a novel mathematical model is proposed for a non contacting optical flexible 3d measurement system constructed by the two theodolites.
文中以透视投影变换为依据，为基于两台经纬仪形成的一种非接触式光学柔性三坐标测量系统提出了一全新的数学模型。
Moreover, the set up of the system is more random and flexible, and the application value of the non contacting optical flexible 3d measurement system is enhanced.
而且使系统的建立更为随意、灵活，增强了非接触式光学柔性三坐标测量系统的应用价值。
Moreover, the set up of the system is more random and flexible, and the application value of the non contacting optical flexible 3d measurement system is enhanced.
而且使系统的建立更为随意、灵活，增强了非接触式光学柔性三坐标测量系统的应用价值。
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