Espresso Crema Analysis with f-AnoGAN

Jintak Choi, Seungeun Lee and Kyungtae Kang ()
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Jintak Choi: Major in Bio Artificial Intelligence Department of Applied Artificial Intelligence, Hanyang University, Ansan 15588, Republic of Korea
Seungeun Lee: Department of Computer Science and Engineering, Hanyang University, Ansan 15588, Republic of Korea
Kyungtae Kang: Department of Artificial Intelligence, Hanyang University, Ansan 15588, Republic of Korea

Mathematics, 2025, vol. 13, issue 4, 1-21

Abstract: This study proposes a system that evaluates the quality of espresso crema in real time using the deep learning-based anomaly detection model, f-AnoGAN. The system integrates mobile devices to collect sensor data during the extraction process, enabling quick adjustments for optimal results. Using the GrabCut algorithm to separate crema from the background, the detection accuracy is improved. The experimental results show an increase of 0.13 in ROC-AUC in the CIFAR-10 dataset and, in crema images, ROC-AUC improved from 0.963 to 1.000 by VAE and hyperparameter optimization, achieving the classification of optimal anomalies in the image. A Pearson correlation coefficient of 0.999 confirms the effectiveness of the system. Key contributions include hyperparameter optimization, improved f-AnoGAN performance using VAE, integration of mobile devices, and improved image preprocessing. This research demonstrates the potential of AI in the management of coffee quality.

Keywords: deep learning; f-AnoGAN; GrabCut; variational autoencoder; coffee crema; espresso (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2025
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