Discriminating morphologically similar species in genus Cinnamomum (Lauraceae) using deep convolutional neural networks

• Main Authors: Hao-Wen Yang, 楊皓文
• Other Authors: Yan-Fu Kuo
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/e55e9v

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 107 === Tree and seedling adulteration has becoming an issue in plant cultivation. Cinnamomum osmophloeum (Lauraceae) is an evergreen plant that yields cinnamaldehyde compound and has high economic value. Although morphologically resembling C. osmophloeum, two other species, C. burmannii and C. insulari-montanum, do not produce cinnamaldehyde. Adulteration of C. burmannii using C. osmophloeum has been reported in Taiwan. Yet, even for experts, it is challenging to discriminate the three species from their appearance due to their high degree of similarity. This brings economic loss to forest farmers owing to the value discrepancy between the species. This study proposed to identify the three Cinnamomum species using leaf images and deep learning approaches. In the study, leaf images of the three species were acquired from two camps using flatbed scanners. Deep convolutional neural network (CNN) classifiers based on VGG16, Inception-V3, and NASNet models were then developed using the leaf images collected from one garden as the training samples. The result showed that the developed deep CNN classifiers reached a test accuracy of at least 0.87 on the images collected from the other garden. The developed CNN classifiers also outperformed support vector machine classifiers.