There are many standards in tobacco grade classifying, and tobacco leaf structure is a important standard.
烟草等级分类有很多标准，烟叶叶片结构是其中的标准之一。
Through this study, supplied valuable references for tobacco classification standard . tobacco leaf quality database, computer color identification system study etc.
通过研究为烟草分级标准的研究、烟叶质量数据库研究、计算机颜色识别研究等提供了一定的参考价值。
The principle of grading is comparing the inspected tobacco leaf with the standard tobacco leaves.
其基本原理是，建立标准样本烟叶的特征数据库，将待测烟叶与样本烟叶比较而进行分级。
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