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基于STM32微控制器的表面缺陷視覺檢測方法

來源：電工電氣發布時間：2024-03-11 08:11 瀏覽次數：685

基于STM32微控制器的表面缺陷視覺檢測方法

汪國平¹，胡博²，陳仲生^1，3，侯幸林³

(1 湖南工業大學電氣與信息工程學院，湖南株洲 412007；

2 南京理工大學瞬態物理國家重點實驗室，江蘇南京 210094；

3 常州工學院汽車工程學院, 江蘇常州 213032)

摘要：表面缺陷檢測是產品質檢的重要工序之一，現有深度學習視覺檢測大多基于云端服務器，存在模型大、算力需求高、成本高等不足。以 STM32 微控制器為核心，提出了一種基于輕量化網絡的表面缺陷視覺檢測方法，采用輕量級 SSD 作為缺陷檢測模型，利用 MobileNetV1 替換原有的骨干網絡 VGG-16 以減小網絡規模；采用 INT8 量化的訓練后量化方法對模型進行計算加速，生成的 TFlite 模型僅有 578 KB，運行占用 RAM 僅為 288.29 KB，并在 STM32 微控制器中實現了模型的移植和部署。實驗測試結果表明，該方法能實現鋰電池表面劃痕和凹坑兩種缺陷的邊緣側準確檢測。

關鍵詞： 表面缺陷檢測；輕量化網絡；視覺檢測；STM32 微控制器

中圖分類號：TM930.12+6 ；TM930.9 文獻標識碼：A 文章編號：1007-3175(2024)02-0047-06

Visual Detection Method of Surface Defects Based on STM32 Microcontroller

WANG Guo-ping¹, HU Bo², CHEN Zhong-sheng^1,3, HOU Xing-lin³

（1 College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;

2 National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China;

3 College of Automotive Engineering, Changzhou Institute of Technology, Changzhou 213032, China）

Abstract: Surface defect detection is one of important processes of product quality inspection, most of existing deep learning visual inspection is based on cloud servers, which has disadvantages of large models, high requirements of computing power and high costs. To this end, this paper uses the STM32 microcontroller as the core and proposes an light-weight network-based visual detection method of surface defects. Firstly, the lightweight SSD is used as the defect detection model, where the original backbone network VGG-16 is replaced by the MobileNetv1 to reduce the network scale. Then, the post-training quantization method based on the INT8 quantization is used to accelerate the model calculation, and the generated TFlite model was only 578 KB, and the RAM occupied by operation was only 288.29 KB, and the model was ported and deployed in the STM32 microcontroller. Finally, the experimental test results show that the proposed method can accurately detect the edge side of scratches and pits on the surface of lithium batteries.

Key words: surface defect detection; light-weight network; visual detection; STM32 microcontroller

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基于STM32微控制器的表面缺陷視覺檢測方法