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In Journal of the science of food and agriculture

BACKGROUND : The San Francisco Valley region from Brazil is known worldwide for its fruit production and exportation, especially grapes and wines. The grapes have high quality due not only to the excellent morphological characteristics, but also to the pleasant taste of their fruits. Such features are obtained because of the climatic conditions present in the region. In addition to the favorable climate for grape cultivation, harvesting at the right time interferes with fruit properties.

RESULTS : This work aims to define grape maturation stage of Syrah and Cabernet Sauvignon cultivars with the aid of deep learning models. The idea of working with these algorithms came from the fact that the techniques commonly used to find the ideal harvesting point are invasive, expensive, and take a long time to get their results. In this work, Convolutional Neural Networks (CNNs) were used in an image classification system, in which grape images were acquired, pre-processed and classified based on their maturation stage. Images were acquired with varying illuminants that were considered as parameters of the classification models, as well as the different post-harvesting weeks. The best models achieved maturation classification accuracy of 93.41% and 72.66% for Syrah and Cabernet Sauvignon, respectively.

CONCLUSIONS : It was possible to correctly classify wine grapes using computational intelligent algorithms with high accuracy, regarding the harvesting time, corroborating chemometric results. This article is protected by copyright. All rights reserved.

Ramos Rodrigo Pereira, Gomes J├ęssica Santana, Prates Ricardo Menezes, Simas Filho Eduardo F, Teruel Mederos Barbara Janet, Costa Daniel Dos Santos


Deep learning, Grape maturation, Image processing, Post-harvest