Plant Phenomics / 2021 / Article / Fig 2

Research Article

Classification of Rice Yield Using UAV-Based Hyperspectral Imagery and Lodging Feature

Figure 2

Hyperspectral camera calibration and image acquisition. (a) Calibration of the exposure time with a standard whiteboard in sunlight (a-1) including taking a white image (a-2), dark background image (a-3), and dark background image with increased exposure time (a-4). (b) Reference reflectance panels of 20%, 40%, and 60% reflectivity, respectively. (c) UAV flying at a height of 90 m during image acquisition. (d) Exemplary sample area and corresponding spectral curve of rice and soil.