基于低空无人机影像光谱和纹理特征的棉花氮素营养诊断研究
Cotton Nitrogen Nutrition Diagnosis Based on Spectrum and Texture Feature of Images from Low Altitude Unmanned Aerial Vehicle
图2. 棉花不同生育期的真彩色合成影像与对应时期剔除土壤背景前后反射率的变化
A,B：孕蕾期;C,D：初花期;E,F：盛花期
Fig. 2. True color synthetic images of cotton during different growth stages and changes in reflectance before and after soil background removal in corresponding periods
A, B: Bud; C, D: Early bloom; E, F: Peak bloom
