DETECTION OF DISEASE SYMPTOMS ON HYPERSPECTRAL 3D PLANT MODELS

Abstract

We analyze the benefit of combining hyperspectral images information with 3D geometry information for the detection of Cercospora leaf spot disease symptoms on sugar beet plants. Besides commonly used one-class Support Vector Machines, we utilize an unsupervised sparse representation-based approach with group sparsity prior. Geometry information is incorporated by representing each sample of interest with an inclination-sorted dictionary, which can be seen as an 1D topographic dictionary. We compare this approach with a sparse representation based approach without geometry information and One-Class Support Vector Machines. One-Class Support Vector Machines are applied to hyperspectral data without geometry information as well as to hyperspectral images with additional pixelwise inclination information. Our results show a gain in accuracy when using geometry information beside spectral information regardless of the used approach. However, both methods have different demands on the data when applied to new test data sets. One-Class Support Vector Machines require full inclination information on test and training data whereas the topographic dictionary approach only need spectral information for reconstruction of test data once the dictionary is build by spectra with inclination.

Plant phenotyping relevance

サトウダイコンの病害症状を、ハイパースペクトル画像と3D形状から検出する手法の比較・開発が研究の中心であり、植物状態の推定に直接関与する。

Code and data availability

The paper describes hyperspectral 3D plant models of sugar beet plants and custom analysis (topographic dictionary sparse representation, OCSVM), but contains no data availability statement, no public dataset or code deposit, and no author-provided URLs. The only mentioned software is the generic third-party library 'L

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