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By analyzing the spectral curve, knew the reflection-absorption and coding characteristics; 通過分析光譜曲線，了解橡膠樹葉片反射、吸收以及編碼特征；
The local maximum and minimum in reflectance spectral curve, corresponding to reflectance apex and Absorption apex, can be used to retrieval also, but effective matching strategy should be adopted. 基於光譜特征的檢索可以通過提取反射和吸收光譜、光譜特征匹配的方法進行；