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Agus Dharmawan
Universitas Negeri Malang
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Development of Android application for coffee roast level classification using CNN mobilenetev3 based on digital image analysis Pakaya, Isran Mohamad; Radi, Radi; Dharmawan, Agus; Nurmaisari, Melda
Journal of Tropical AgriFood Volume 8 Nomor 3 Tahun 2026
Publisher : Department of Agricultural Products Technology, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35941/jtaf.8.3.2026.26928.202-212

Abstract

Coffee is one of Indonesia's key commodities with high economic value in both domestic and international markets. Roasting is a crucial stage in coffee processing, as it directly influences the final taste and aroma. However, until now, the roasting level has been determined visually and subjectively, making it prone to human error. This study aimed to develop an automatic classification system for coffee roasting levels using a Convolutional Neural Network (CNN) approach integrated into an Android application. The CNN model was built using the MobileNetV3 architecture and applied with a transfer learning method on Google Colab. The dataset consisted of 1,600 coffee images with three roasting levels: light, medium, and dark. The trained model was then converted into TensorFlow Lite (TFLite) format for integration into an Android application called RoastScan. This app features automatic classification through the camera or gallery and provides real-time predictions with confidence levels. The evaluation results show that the model has a classification accuracy of 97% on the test data, with high precision, recall, and F1-score across all classes. Further testing via the application showed that the best accuracy reached 93.55%. These findings suggest that integrating CNN with mobile applications has the potential to be a practical, efficient, and accurate solution for determining coffee roasting degrees, as well as supporting the standardization of coffee product quality at both industrial and MSME levels.
Co-Authors Abdul Gofur Abdul Gofur Abdul Gofur Ahmad Mutafakkir Alam Alifa Aulia Ainayya Anggy ulul Ningtyas Anisa Fariantika Arifin Puji Widodo Bambang Banu Siswoyo Bambang Marhaenanto Bambang Purwantana Dania Merit Novitasari Fatchur Rohman Hadi Nur Hadi Nur Hadi Suwono Husamah Husamah Husni Wahyu Wijaya Indra Kurniawan Saputra Indradewa, Rhian Isran Mohamad Pakaya Laily Asfany M. J. Dewiyani Sunarto Manzilatul Rochmah Mardiana Lelitawati Mimien Henie Irawati Mita Larasati Mita Larasati Mochammad Yordan Adi Pratama Mohamad Amin Mohamad Wawan Sujarwo Muhamad Syaikhu Alam Muhammad Shoumul Misbah Muhammad Taufiq Nadila Sekar Zahida Nuning Wulandari Nur'aini Kartikasari Nurjannah Nurjannah Nurmaisari, Melda Nurul Hikmah Pakaya, Isran Mohamad Pramesti Dwi Rhumana Radi Radi Ridho Aka Qomarizzaman Ruchimah Achmad Rudiati Evi Masithoh Silmy Kaffah Siswoyo Soekarno Sofia Ery Rahayu Sri Rahayu Lestari Sueb Suhadi Suhadi Suhadi Suhadi Sulisetijono Sulisetijono Syarif, Eka Aghnia Syihabudhin Tampatty, Jovansa Tasafima Tesari Tesari, Tasafima Vivi Ary Lindya Putri Vivi Novianti Yunita Rakhmawati