In Human Vision System, the optical signal is separated to brightness and chroma information, and they are processing differently. It is an important quality of Human Vision System.
Brightness level of the road lighting should be of the mesopic vision category.
道路照明中的亮度水平应属中间视觉范畴。
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But besides noises, there are some other interference factors which weaken the vision effect of digital image greatly, like image contrast, image brightness and image sharpness, etc.