In most of cases, the laser scanning confocal microscopy images, such as fluorescence stained biomedical nuclei, are blurred and have a wide range of brightness and poor intensity homogeneity.

共焦显微图象如荧光染色细胞核图象，往往是一种比较模糊的图象，并且亮度范围大，灰度均匀度也较差。

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At left, you can see that most digital cameras struggle when there are very bright brights and very dark darks in the same photo; they don’t perceive as wide a range of brightness as your eye does.

左边那张是多数普通数码相机照出的效果，要么非常的亮，要么非常的暗，它不能像你的眼睛一样有很广的感光范围。

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The numbers are part of a grayscale system in which brightness is measured in a range of values.

这些数字是灰度系统的一部分，其亮度由一系列数值测量。

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