A Mobile-Based Deep Learning Model for Cassava Disease Diagnosis.

Abstract

Convolutional neural network (CNN) models have the potential to improve plant disease phenotyping where the standard approach is visual diagnostics requiring specialized training. In scenarios where a CNN is deployed on mobile devices, models are presented with new challenges due to lighting and orientation. It is essential for model assessment to be conducted in real world conditions if such models are to be reliably integrated with computer vision products for plant disease phenotyping. We train a CNN object detection model to identify foliar symptoms of diseases in cassava ( Manihot esculenta Crantz). We then deploy the model in a mobile app and test its performance on mobile images and video of 720 diseased leaflets in an agricultural field in Tanzania. Within each disease category we test two levels of severity of symptoms-mild and pronounced, to assess the model performance for early detection of symptoms. In both severities we see a decrease in performance for real world images and video as measured with the F-1 score. The F-1 score dropped by 32% for pronounced symptoms in real world images (the closest data to the training data) due to a decrease in model recall. If the potential of mobile CNN models are to be realized our data suggest it is crucial to consider tuning recall in order to achieve the desired performance in real world settings. In addition, the varied performance related to different input data (image or video) is an important consideration for design in real world applications.

Plant phenotyping relevance

カッサバ葉の病徴をCNNで検出・重症度別に評価し、モバイル画像・動画で実環境性能を検証する手法開発研究であり、植物フェノタイピング手法が中心である。

Code and data availability

The paper's cassava leaf image dataset (2,415 images) is described as previously reported in Ramcharan et al. (2017) with no authors' public URL given in the supplied text. The real-world field evaluation data (images and screen-capture videos of 720 leaflets) are explicitly stated to be 'available upon request'. Thes

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