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。
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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