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.
人类视觉系统把到达人眼的光学信号分离为亮度和色度信息，并对它们做不同的处理，这是人类视觉系统的一个重要性质。
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。
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.
但是通常影响数字图像的视觉效果，除了噪声以外，还存在其它的因素，如图像对比度、图像亮度、图像清晰度等等。
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