4.7 Article

MFCIS: an automatic leaf-based identification pipeline for plant cultivars using deep learning and persistent homology

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HORTICULTURE RESEARCH
卷 8, 期 1, 页码 -

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NANJING AGRICULTURAL UNIV
DOI: 10.1038/s41438-021-00608-w

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资金

  1. National Key Research and Development Program of China [2016YFD0101900]
  2. Sanya Science and Education Innovation Park of Wuhan University of Technology of China [2020KF0053]
  3. Wuhan University of Technology of China [104-40120526]

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A novel cultivar identification system called MFCIS was proposed, which achieved high accuracy by combining persistent homology and CNN to extract multiple leaf morphological features. The system was validated on sweet cherry and soybean datasets, demonstrating an effective method for plant breeders to identify plant cultivars efficiently.
Recognizing plant cultivars reliably and efficiently can benefit plant breeders in terms of property rights protection and innovation of germplasm resources. Although leaf image-based methods have been widely adopted in plant species identification, they seldom have been applied in cultivar identification due to the high similarity of leaves among cultivars. Here, we propose an automatic leaf image-based cultivar identification pipeline called MFCIS (Multi-feature Combined Cultivar Identification System), which combines multiple leaf morphological features collected by persistent homology and a convolutional neural network (CNN). Persistent homology, a multiscale and robust method, was employed to extract the topological signatures of leaf shape, texture, and venation details. A CNN-based algorithm, the Xception network, was fine-tuned for extracting high-level leaf image features. For fruit species, we benchmarked the MFCIS pipeline on a sweet cherry (Prunus avium L.) leaf dataset with >5000 leaf images from 88 varieties or unreleased selections and achieved a mean accuracy of 83.52%. For annual crop species, we applied the MFCIS pipeline to a soybean (Glycine max L. Merr.) leaf dataset with 5000 leaf images of 100 cultivars or elite breeding lines collected at five growth periods. The identification models for each growth period were trained independently, and their results were combined using a score-level fusion strategy. The classification accuracy after score-level fusion was 91.4%, which is much higher than the accuracy when utilizing each growth period independently or mixing all growth periods. To facilitate the adoption of the proposed pipelines, we constructed a user-friendly web service, which is freely available at http://www.mfcis.online.

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