《Table 1 Types and characteristics of leather defects》

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《Description and Classification of Leather Defects Based on Principal Component Analysis》

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To classify defects，a w ay of hierarchical classification[6]is adopted.Its essence is to decompose the know n data until certain conditions are met.In the process of inspecting defects，the geometric shape feature is the most important feature of human sensory vision Then it is divided into different shape categories.According to the appearance features of defects，such as texture and gray-scale，they are classified，and finally the data of defects are classified，as show n in Table 1.