Physical studies of the eyes and retinas of fish show that the majority can obtain a clearly focused image, detect motion, and have good contrast-detection ability.

物理研究鱼的眼睛和视网膜显示大多数鱼能获得清晰对焦的图像，侦测动作，并具有良好的反差度检测能力。

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The second is, base on new RS image, detect newly added roads automatically and semi-automatically.

二是基于新遥感影像，自动或半自动的检测新增道路。

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Using millimeter wave technology, which the TSA says emits 10, 000 times less radio frequency than a cell phone, the machine scans a traveler and a robotic image is generated that allows security personnel to detect potential threats -- and, some fear, more -- beneath a person's clothes.

CNN: Airport security bares all, or does it?

At sunset, the sun appears red (the blue light has been scattered out of that image, too), so the cells of the eye that detect red are overloaded and incapable of registering weaker red signals.

ECONOMIST: In a flash