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。

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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.

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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