求翻译：本文通过研究经典的变化检测算法，分析其原理，总结其优缺点，改进图像差值法算法，得出了一种基于非全局灰度平均值的变化检测方法是什么意思？

By studying classical change detection algorithm , analyze its principles, summarize their advantages and disadvantages , to improve the image difference method algorithm obtained a non- change detection method based on global average gray

This document by the classic of change detection algorithms, analysis of their works, to take stock of its strengths and weaknesses, and improve the image difference is the algorithm, it was concluded that based on a non-global grayscale changes in average detection method

This article through the research classics change examination algorithm, analyzes its principle, summarizes its good and bad points, the improvement image interpolation law algorithm, has obtained one kind based on the non-overall situation gradation mean value change examination method

Change detection algorithm based on the classic, analyze its principles, summary of pros and cons, improved image subtraction algorithm, obtained a change detection method based on non-global mean gray

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