An Image Preprocessing Integration Strategy Combined with Improved YOLOv8 Model for Identification of Microalgae Species

NING Jing; ZHONG Yue-yan; LIU Xue-ying; XIE Li-xia; WANG Tong

doi:10.12452/j.fxcsxb.250223113

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An Image Preprocessing Integration Strategy Combined with Improved YOLOv8 Model for Identification of Microalgae Species

Scientific Papers | 更新时间：2025-06-09

- An Image Preprocessing Integration Strategy Combined with Improved YOLOv8 Model for Identification of Microalgae Species
- Journal of Instrumental Analysis Vol. 44, Issue 6, Pages: 1024-1033(2025)
- 作者机构：
  
  1.湖南工业大学生命科学与化学学院，百合种质资源创新与深加工湖南省工程研究中心，湖南株洲 412007
  2.湖南大学化学化工学院，化学生物传感与计量学国家重点实验室，湖南长沙 410082
- 作者简介：
- 基金信息：
- DOI：10.12452/j.fxcsxb.250223113
  CLC： O657;TB9
- Received：23 February 2025，
  
  Revised：01 April 2025，
  
  Accepted：02 April 2025，
  
  Published：15 June 2025
- 稿件说明：
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宁静,钟月妍,刘学英,谢丽霞,王童.图像预处理整合策略结合改进YOLOv8模型用于微藻种类识别[J].分析测试学报,2025,44(06):1024-1033.

NING Jing,ZHONG Yue-yan,LIU Xue-ying,XIE Li-xia,WANG Tong.An Image Preprocessing Integration Strategy Combined with Improved YOLOv8 Model for Identification of Microalgae Species[J].Journal of Instrumental Analysis,2025,44(06):1024-1033.
宁静,钟月妍,刘学英,谢丽霞,王童.图像预处理整合策略结合改进YOLOv8模型用于微藻种类识别[J].分析测试学报,2025,44(06):1024-1033. DOI： 10.12452/j.fxcsxb.250223113.

NING Jing,ZHONG Yue-yan,LIU Xue-ying,XIE Li-xia,WANG Tong.An Image Preprocessing Integration Strategy Combined with Improved YOLOv8 Model for Identification of Microalgae Species[J].Journal of Instrumental Analysis,2025,44(06):1024-1033. DOI： 10.12452/j.fxcsxb.250223113.

摘要

为解决传统的微藻检测方法依赖于人工镜检、分析时间长且检测结果易受检测人员技术经验影响等问题，提出了一种图像预处理整合策略结合改进YOLOv8模型的深度学习方法用于微藻识别。采用高斯模糊、拉普拉斯算子和主成分分析多方法整合策略对微藻显微图像进行预处理。在改进模型中，引入SPD-Conv模块减少细粒度信息的丢失以提高低分辨率图像和小尺寸微藻的检测性能，采用Slim-neck结构减少参数数量和模型大小，同时加入SimSPPF加速模型收敛，提高运行效率。结果表明，多方法整合的预处理策略能够显著减少图像中的噪声，同时增强微藻轮廓清晰度。在相同条件下，改进YOLOv8模型的平均精度均值（mAP）达到92.2%，检测效率比原始YOLOv8模型提高了5.1%，且对于小尺寸微藻表现出更优的检测性能。相较于Faster-RCNN、SSD、RTDETR-l、YOLOv3、YOLOv5、YOLOv6和YOLOv7模型，改进YOLOv8模型的mAP分别提升了40.2%、6.8%、14.5%、1.2%、5.7%、4.7%和0.8%。该方法为开发微藻种类检测技术提供了有价值的参考。

Abstract

To address the limitations of traditional microalgae detection methods，which rely on manual microscopy，result in prolonged analysis times，and produce results that are highly susceptible to the technical expertise of personnel，an integrated image preprocessing strategy combined with an enhanced YOLOv8 deep learning model for microalgae identification was proposed. A multi-method integration strategy of Gaussian fuzzy，Laplacian operator and principal component analysis was used to preprocess microalgae images. In the improved model，the SPD-Conv module was incorporated to mitigate the loss of fine-grained information，thereby improving the detection performance for low-resolution images and small-sized microalgae. A slim-neck architecture was employed to reduce the parameter count and model size，while the SimSPPF was introduced to expedite model convergence and enhance operational efficiency. The experimental results demonstrated that the multi-method integrated preprocessing strategy was able to substantially reduce image noise，and enhance the definition of microalgal contours. Under identical conditions，the improved YOLOv8 model achieved a mean average precision（mAP） of 92.2%，representing a 5.1% improvement over the original YOLOv8 model. Especially，it demonstrated superior performance in detecting small-sized microalgae. In comparison to Faster-RCNN，SSD，RTDETR-l，YOLOv3，YOLOv5，YOLOv6 and YOLOv7 models，the mAP of improved YOLOv8 model increased by 40.2%，6.8%，14.5%，1.2%，5.7%，4.7% and 0.8%，respectively. This method offers valuable insights for advancing microalgae species detection technology.

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