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Three-Dimensional Monitoring of Plant Structural Parameters and Chlorophyll Distribution

Author:
Itakura, Kenta  Kamakura, Itchoku  Hosoi, Fumiki  


Journal:
SENSORS


Issue Date:
2019


Abstract(summary):

Image analysis is widely used for accurate and efficient plant monitoring. Plants have complex three-dimensional (3D) structures; hence, 3D image acquisition and analysis is useful for determining the status of plants. Here, 3D images of plants were reconstructed using a photogrammetric approach, called structure from motion. Chlorophyll content is an important parameter that determines the status of plants. Chlorophyll content was estimated from 3D images of plants with color information. To observe changes in the chlorophyll content and plant structure, a potted plant was kept for five days under a water stress condition and its 3D images were taken once a day. As a result, the normalized Red value and the chlorophyll content were correlated; a high R-2 value (0.81) was obtained. The absolute error of the chlorophyll content estimation in cross-validation studies was 4.0 x 10(-2) g/mm(2). At the same time, the structural parameters (i.e., the leaf inclination angle and the azimuthal angle) were calculated by simultaneously monitoring the changes in the plant's status in terms of its chlorophyll content and structural parameters. By combining these parameters related to plant information in plant image analysis, early detection of plant stressors, such as water stress, becomes possible.


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