Journal Article

Yield estimation of high-density cotton fields using low-altitude UAV imaging and deep learning

Zhang, Ruoyu, Li, Fei, Zhang, Mengyun, Bai, Jingya

2022

Overview

Background China has a unique cotton planting pattern. Cotton is densely planted in alternating wide and narrow rows to increase yield in Xinjiang, China, causing the difficulty in the accurate estimation of cotton yield using remote sensing in such field with branches occluded and overlapped. Results In this study, unmanned aerial vehicle (UAV) imaging and deep convolutional neural networks (DCNN) were used to estimate densely planted cotton yield. Images of cotton fields were acquired by the UAV at an altitude of 5 m. Cotton bolls were manually harvested and weighed afterwards. Then, a modified DCNN model (CD-SegNet) was constructed for pixel-level segmentation of cotton boll images by reorganizing the encoder-decoder and adding dilated convolutions. Besides, linear regression analysis was employed to build up the relationship between cotton boll pixels ratio and cotton yield. Finally, the estimated yield for four cotton fields were verified by weighing harvested cotton. The results showed that CD-SegNet outperformed the other tested models, including SegNet, support vector machine (SVM), and random forest (RF). The average error in yield estimates of the cotton fields was as low as 6.2%. Conclusions Overall, the estimation of densely planted cotton yields based on low-altitude UAV imaging is feasible. This study provides a methodological reference for cotton yield estimation in China.

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
• Subject: Accelerating image-based plant phenotyping and pattern recognition: deep learning or few-shot learning? / Accuracy / Agricultural production / Algorithms / Altitude / Analysis / Artificial neural networks / Biological Techniques / Biomedical and Life Sciences / China / Coders / Cotton / Crop yield / Crop yields / Deep learning / Densely planted cotton / Drone aircraft / Encoders-Decoders / Estimates / Harvesting / Image acquisition / image analysis / Image processing / Image segmentation / Life Sciences / Low altitude / Machine learning / Methods / Neural networks / Pixels / Plant Sciences / Regression analysis / Remote sensing / SegNet / Semantics / Support vector machines / Technology application / Unmanned aerial vehicle / Unmanned aerial vehicles / Yield estimation