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A research team led by Dr. David Helman from the Faculty of Agriculture, Food and Environment at the Hebrew University of Jerusalem has developed a novel machine learning model employing hyperspectral imaging to assess the quality of tomatoes before harvest. Hyperspectral images of specific ranges of light wavelengths, known as spectral bands, are used to study objects' properties based on how they reflect light.

The research paper, titled "Machine learning models based on hyperspectral imaging for pre-harvest tomato fruit quality monitoring," was in Computers and Electronics in Agriculture.

This pioneering approach addresses challenges associated with traditional methods, offering a faster, non-destructive, and cost-effective alternative.

The study, conducted in collaboration with researchers from Bar-Ilan University and the Volcani Center, used a handheld hyperspectral camera to collect data from 567 tomato fruits across five cultivars.

Machine learning algorithms, including Random Forest and Artificial Neural Networks, were employed to predict seven critical quality parameters: weight, firmness, total soluble solids (TSS), citric acid, ascorbic acid, lycopene, and pH. The models demonstrated high accuracy, with the Random Forest algorithm achieving an R² of 0.94 for weight and 0.89 for firmness, among others.

Key findings of the study include:

• Efficiency in Band Selection: The model effectively predicts quality parameters using only five spectral bands, paving the way for the development of affordable, portable devices.
• Broader Applicability: Tested across diverse cultivars and growing conditions, the model exhibits robustness and scalability.
• Pre-Harvest Benefits: Farmers can now monitor fruit quality during ripening stages, optimizing harvest timing and improving produce quality.

"Our research aims to bridge the gap between advanced imaging technology, AI, and practical agricultural applications," said Dr. Helman.

"This work has the potential to revolutionize quality monitoring not only in tomatoes but also in other crops. Our next step is to build a low-cost device (ToMAI-SENS) based on our model that will be used across the fruit value chain, from farms to consumers."

The study highlights the potential integration of this technology into agricultural practices, from smart harvesting systems to consumer tools for evaluating the quality of produce in supermarkets.