Object: to evaluate mesopic contrast threshold under 3 kinds of background and to explore the effect of adaptation time, adaptation luminance and glare on contrast threshold of humans eye.

目的评估3种背景环境下的中间视觉对比度阈值，并探讨暗适应时间、背景亮度和眩光对人眼对比度阈值的影响。

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However, there always exists relatively large number of false positives in the segmentation results near the edges of moving objects and it suffers from slow adaptation to the changing background.

但是，它的分割结果中在目标物边缘附近存在较多的虚警，而且还存在对变化的背景适应缓慢的问题。

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In view of this background, the article researches on cultural adaptation issues of peasants who migrate to cities.

本文即从这一研究背景出发，对进城农民的文化适应性问题进行广泛的研究分析。

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