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通过提取直方图的外层，以及计算像素点周围的局部模糊程度来更新粗糙度。
By extracting encrustation of histogram, and calculating partial fuzzy extent around pixels to update the fuzzy roughness.
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外层披毛浓厚、粗糙、杂乱、卷曲，呈不规则起伏的样子。
The outer coat is dense, rough, coarse and crisp, of broken appearance.
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