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该算法通过对实际路面的平均灰度值随时间变化趋势进行了统计学习，寻找出随天气季节变化的昼夜区分时间。
An algorithm of distinguishing day and night with image statistics is proposed based on the analysis of the characteristics of the grey level of actual road surface.
然后，神命令：“天上要有光体来区分昼夜，显示日期、年岁和祭神庆典的起始；
Then God commanded, "Let lights appear in the sky to separate day from night and to show the time when days, years, and religious festivals begin;"
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