first order region selection 一阶矩区域选择
In order to achieve a better understanding of global structure of the system, first, we introduce a new concept that is called double sector region in chapter III.
在第三章中，为了更好的讨论系统的全局拓扑结构，本文首次引入双扇形区域的概念；
The first stage, performed by the extraction unit (110), employs an analysis of gray values of the image data in order to extract the candidate region.
由提取单元（110）执行的第一阶段使用对图像 数据灰度值的分析以便提取候选区域。
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