Detecting diseases and insect pests in litchi based on improved Faster R-CNN

XIE Jiaxing; LIAO Fei; WANG Weixing; GAO Peng; HU Kai; WU Peiwen; DENG Zhengqi; LIU Hongshan

doi:10.13300/j.cnki.hnlkxb.2025.01.007

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Detecting diseases and insect pests in litchi based on improved Faster R-CNN

Horticulture·Forestry | 更新时间：2026-11-05

- Detecting diseases and insect pests in litchi based on improved Faster R-CNN
- Journal of Huazhong Agricultural University Vol. 44, Issue 1, Pages: 62-73(2025)
- 作者机构：
  
  1.华南农业大学电子工程学院（人工智能学院），广州 510642
  2.广东省农情信息监测工程技术中心，广州 510642
  3.华南农业大学珠江学院，广州 510900
- 作者简介：
- 基金信息：
- DOI：10.13300/j.cnki.hnlkxb.2025.01.007
  CLC： TP391.4;S436.629
- Received：11 September 2024，
  
  Published：15 January 2025
- 稿件说明：
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谢家兴，廖飞，王卫星，等.基于改进Faster R-CNN的荔枝病虫害检测［J］.华中农业大学学报，2025，44（1）：62‐73.

XIE Jiaxing,LIAO Fei,WANG Weixing,et al.Detecting diseases and insect pests in litchi based on improved Faster R-CNN[J].Journal of Huazhong Agricultural University,2025,44(01):62-73.
谢家兴，廖飞，王卫星，等.基于改进Faster R-CNN的荔枝病虫害检测［J］.华中农业大学学报，2025，44（1）：62‐73. DOI： 10.13300/j.cnki.hnlkxb.2025.01.007.

XIE Jiaxing,LIAO Fei,WANG Weixing,et al.Detecting diseases and insect pests in litchi based on improved Faster R-CNN[J].Journal of Huazhong Agricultural University,2025,44(01):62-73. DOI： 10.13300/j.cnki.hnlkxb.2025.01.007.

摘要

针对荔枝园复杂背景下荔枝小目标病虫害检测困难的问题，提出一种基于改进Faster R-CNN的荔枝病虫害检测方法。以Faster R-CNN为基础，使用特征提取能力更优秀的Swin Transformer代替原有主干网络VGG16；通过特征金字塔网络（feature pyramid network， FPN）提升Faster R-CNN模型的多尺度特征融合能力，均衡提高每一类荔枝病虫害的识别精确率；引入感兴趣区域对齐（region of interest align， ROI Align）策略提升模型的候选框定位精度，进一步提升模型的整体检测效果。结果显示，改进后的模型平均精度均值达到92.76%，相较原始Faster R-CNN检测器提升了30.08百分点，在5类荔枝病虫害图像（藻斑病、炭疽病、煤烟病、毛毡病、叶瘿蚊）中的检测精度分别为93.05%、94.81%、96.57%、87.03%和92.34%，平均精度均值比SSD512、RetinaNet、EfficientDet-d0和YOLOv5s模型分别提高了20.50、5.70、13.08和3.26百分点。结果表明，改进后的Faster R-CNN模型能准确检测复杂背景下的荔枝病虫害目标，具有较高的应用价值，能为农作物病虫害快速、准确识别研究提供参考。

Abstract

A method of detecting diseases and insect pests in litchi based on improved Faster R-CNN was proposed to solve the problems of detecting small targets of diseases and pests in complex backgrounds of litchi orchards. Swin Transformer with superior capabilities of extracting feature was used to replace the original backbone network VGG16 based on Faster R-CNN. The feature pyramid network （FPN） was used to enhance capability of the multi-scale feature fusion in the Faster R-CNN model， thereby improving the precision of identifying each type of diseases and insect pests in litchi in a balanced manner. The ROI Align strategy was introduced to refine the precision of the candidate box localization in the model， leading to the enhancement in the performance of overall detection in the model. The result showed that the average accuracy of the improved model was 92.76%， 30.08 percentage points higher than that of the original Faster R-CNN detector. The precision of detecting images of five types of diseases and insect pests including algal leaf spot， anthracnose， sooty mold， felt disease， and leaf gall in litchi was 93.05%， 94.81%， 96.57%， 87.03%， and 92.34%， respectively. The average precision was improved by 20.50， 5.70， 13.08， and 3.26 percentage points compared with that of SSD512， RetinaNet， EfficientDet-d0， and YOLOv5s model， respectively. It is indicated that the improved Faster R-CNN model can accurately detect diseases and insect pests in litchi with complex backgrounds， and has high value of application. It will provide a reference for studying the rapid and accurate identification of diseases and insect pests in crops.

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references

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