An automatic landmarking algorithm for leaf morphology based on conformal mapping

文献类型： 外文期刊

第一作者： Zhong, Peige

作者： Zhong, Peige;Zhu, Jinyu;Zhong, Peige;Zhou, Hu;Guo, Yan;Li, Baoguo;Ma, Yuntao;Liu, Xiaojun;Ye, Yulu;Zhang, Rui

作者机构：

关键词： Morphometric; Conformal mapping; Dynamic Time Warping algorithm; Leaf phenotyping; Biological homology

期刊名称：COMPUTERS AND ELECTRONICS IN AGRICULTURE （ 影响因子：8.9； 五年影响因子：9.3 ）

ISSN： 0168-1699

年卷期： 2025 年 234 卷

页码：

收录情况： SCI

摘要： Leaf shape is of great significance in plant phenotype research. Landmarks method is a widely used morphometric approach, which can comprehensively describe the morphological differences among leaves. However, the selection of landmarks is time-consuming and laborious. An automatic landmarking algorithm is proposed here. Based on conformal mapping, the leaf outline can be transformed into a monotonically increasing function curve, referred to as the 'fingerprint function'. The Dynamic Time Warping (DTW) algorithm was introduced to match landmarks between different leaves. Two leaf datasets were used to validate the algorithm separately in different species and developmental stages. Dataset1 is a public dataset which covers 26 different types of leaves. The average positional difference between automatic and manual landmarks for dataset1 was only 2.95%. Dataset2 consists of cotton leaves collected in the field at various growth stages, and the positional difference for this dataset was all below 5%. These results validate that our algorithm is applicable to a wide range of leaf types and capable of identifying and locating novel features that emerge during leaf growth. The automatic landmarking algorithm can simulate manual landmarking to a great extent. It provides a new approach for automated acquisition of plant leaf shape homology tailored to the research needs of botanists.

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