KEYWORDS: Cameras, Imaging systems, Sensors, Infrared sensors, Infrared cameras, RGB color model, Time of flight cameras, Infrared radiation, Temperature sensors
By the year 2050 the world population will increase to 9.7 billion people. Food production must increase by at least 70% in order to feed this population. One way to increase food production is to create crop cultivars that can produce high quality and high yielding crops without needing to increase the amount of resources required. Plant breeders are able to create new crop cultivars using high-throughput genotyping techniques, however the current bottleneck in plant breeding is in-field phenotyping. This study focuses on designing a high-throughput in-field proximal phenotyping system capable of collecting non-contact, high-resolution, multi-sensor, multi-view, phenomic data of vegetable plants.
A multi-view stereo vision system for true 3D reconstruction, modeling and phenotyping of plants was created that successfully resolves many of the shortcomings of traditional camera-based 3D plant phenotyping systems. This novel system incorporates several features including: computer algorithms, including camera calibration, excessive-green based plant segmentation, semi-global stereo block matching, disparity bilateral filtering, 3D point cloud processing, and 3D feature extraction, and hardware consisting of a hemispherical superstructure designed to hold five stereo pairs of cameras and a custom designed structured light pattern illumination system. This system is nondestructive and can extract 3D features of whole plants modeled from multiple pairs of stereo images taken at different view angles. The study characterizes the systems phenotyping performance for 3D plant features: plant height, total leaf area, and total leaf shading area. For plants having specified leaf spacing and size, the algorithms used in our system yielded satisfactory experimental results and demonstrated the ability to study plant development where the same plants were repeatedly imaged and phenotyped over the time.
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