Resumo

MAHMUDY, Wayan Firdaus et al. Combination of morphology, wavelet and convex Hull features in classification of patchouli varieties with imbalance data using artificial neural network. J. appl. res. technol [online]. 2021, vol.19, n.6, pp.633-643.  Epub 22-Mar-2022. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2021.19.6.1017.

Patchouli plants are main raw materials for essential oils in Indonesia. Patchouli leaves have a very varied physical form based on the area planted, making it difficult to recognize the variety. This condition makes it difficult for farmers to recognize these varieties and they need experts’ advice. As there are few experts in this field, a technology for identifying the types of patchouli varieties is required. In this study, the identification model is constructed using a combination of leaf morphological, texture, and shape features. The texture features are obtained using Wavelet transformation and the shape features are obtained using convex hull. The feature extraction results are used as input data for training of classification algorithms. The effectiveness of the input features is tested using three classification methods in class of artificial neural network algorithms: (1) feedforward neural networks with backpropagation algorithm for training, (2) learning vector quantization (LVQ), and (3) extreme learning machine (ELM). Synthetic minority over-sampling technique (SMOTE) is employed to solve the problem of class imbalance in the patchouli variety dataset. The results of the patchouli variety identification system by combining these three features indicate the level of recognition with an average accuracy of 72.61%. The accuracy with the combination of these three features is higher when compared to using only morphological features (58.68%) or using only Wavelet features (59.03 %) or both (67.25%). This study also showed that the use of SMOTE in imbalance data increases the accuracy with the highest average accuracy of 88.56%.

Palavras-chave : morphology; wavelet; convex hull; neural network; SMOTE; patchouli variety.