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。

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Because the optical viewfinder is small and recessed into the camera body, it can often be tricky to clean properly.

因为光学取景器较小，并且凹进相机里面，所以合适的清洁方法经常是需要窍门的。

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You can use the same basic technique to clean the LCD viewfinder and the optical viewfinder.

你可以使用相同的基本技术来清洁LCD或光学取景器。

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Then, they move on to clean rooms, where the Dragon sensor and new optical low-pass filter are installed.

ENGADGET: After hours at NAB: A closer look at Red's Dragon upgrade operation (video)

Holography and optical correlation are both inherently analogue processes that can degrade the clean 1s and 0s required in a digital system.

ECONOMIST: Optical recognition