以下为句子列表：
英文: Based on the HSV color model, the method regards the saturation as principle to distinguish the foreground and background, then uses mathematic morphological operation and boundary detection technique to extract valid district of steel pieces.
中文: 采用HSV颜色空间，并以饱和度为主区分前景和背景，再综合运用数学形态学运算及边界跟踪技术提取出钢块的有效区域。
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