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人眼之所以能看见周围的景物,是因为景物反射或自身辐射的可见光(波长范围为0.30-0.76微米)作用于人眼视网膜激起了视觉。人眼只能感觉到可见光,而且必须在照度足够大时才能看清景物。昼间可见光照度大(通常在100勒克司以上),人的视觉有很高的分辨能力和辨别颜色的能力。夜间可见光照度很小(即使在星月满天的夜晚,也只有0.2勒克司),人眼只能区别某些物体的轮廓,且视程很近,分辨力很低。夜间的可见光指月光、星光和大气辉光等微弱的可见光,统称微光。在微光条件下,人的视觉功能受到很大限制。但是,现代的夜视技术可以把微光
The reason why the human eye can see the surrounding scenery, because the scene reflection or its own radiation of visible light (wavelength range 0.30-0.76 microns) on the human retina aroused the visual. Visible to the human eye can only feel, and must be sufficient illumination to see the scene. Large daylight visible light (usually above 100 lux), human vision has a high resolution and the ability to distinguish colors. Visible light at night is very small (even on a starry night, only 0.2 lux), the human eye can only distinguish the outline of some objects, and the distance is very close, the resolution is very low. Visible at night refers to the moonlight, starlight and atmospheric glow and other weak visible light, collectively known as glimmer. In low light conditions, the human visual function is greatly limited. However, modern night-vision technology can shimmer