An Automatic Method for Measuring Strands’ Orientation Angles Based on Convolutional Neural Network

HONG Wujun; LI Wanzhao; HU Yaoqiong; MEI Changtong

doi:10.12326/j.2096-9694.2023185

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An Automatic Method for Measuring Strands’ Orientation Angles Based on Convolutional Neural Network
College of Materials Science and Engineering，Nanjing Forestry University，Nanjing 210037，Jiangsu，China
Vol. 38, Issue 1, Pages: 58-65(2024)
Published： 30 January 2024 ，
DOI： 10.12326/j.2096-9694.2023185

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洪吾俊,李万兆,胡尧琼等.基于卷积神经网络的刨花定向角度自动测量方法构建[J].木材科学与技术,2024,38(01):58-65.

HONG Wujun,LI Wanzhao,HU Yaoqiong,et al.An Automatic Method for Measuring Strands’ Orientation Angles Based on Convolutional Neural Network[J].Chinese Journal of Wood Science and Technology,2024,38(01):58-65.
洪吾俊,李万兆,胡尧琼等.基于卷积神经网络的刨花定向角度自动测量方法构建[J].木材科学与技术,2024,38(01):58-65. DOI： 10.12326/j.2096-9694.2023185.

HONG Wujun,LI Wanzhao,HU Yaoqiong,et al.An Automatic Method for Measuring Strands’ Orientation Angles Based on Convolutional Neural Network[J].Chinese Journal of Wood Science and Technology,2024,38(01):58-65. DOI： 10.12326/j.2096-9694.2023185.

摘要

基于卷积神经网络YOLOv5和最小外接矩形算法，构建一种自动准确地采集铺装刨花定向角度的方法。结果表明，构建的YOLOv5模型识别刨花目标的准确率、召回率和

1值分别为0.992、0.897和0.94，能够有效识别层叠刨花。模型自动测量和人工测量的刨花定向角度具有强相关性（

=0.99），且模型不存在算法缺陷，计算每张刨花铺装图像（像素640×640）用时仅134.7 ms。该刨花定向角度计算模型可以为工业领域优化OSB生产工艺以及提高产品性能提供技术支撑。

Abstract

Oriented strand board (OSB) is a popular wood-based panel product that has gained widespread application in construction

furniture

and other industries due to the high strength

durability

and cost-effectiveness. The basic component of OSB is large strand that is arranged in a specific orientation and bonded together using adhesives to form a strong and durable panel product. The strand’s orientation angle is a key factor that affects the mechanical properties of OSB. The effective collection of information on strands’ orientation angles is important for optimizing the production process and improving product performance. In this study

a method was developed for automatically measuring the strand’s orientation angle with computer vision and machine learning techniques. The method is based on the convolutional neural network YOLOv5 and the minimum outer rectangle algorithm

which can accurately and efficiently identify and measure the strand’s orientation angle during the stranding process. The study evaluated the performance of YOLOv5

the accuracy of automatically calculating the strand’s orientation angle

and the time efficiency of the automatic strand’s orientation angle acquisition. The results of the study showed that the YOLOv5 model was effective in identifying the object from the images of the layered strands

with an accuracy

recall

and

1 value of 0.992

0.897

and 0.94. The model can effectively identify the layered strands. The orientation angles of strands measured by automatic and manual methods were strongly correlated (

= 0.99). There were no orientation angle algorithmic flaws. Furthermore

the method established in this study has high time efficiency

with a processing time of only 134.7 ms for each 640×640-pixel image. In conclusion

the method for automatically measuring the strand’s orientation angle using YOLOv5 and minimum outer rectangle algorithm provides an efficient and accurate way to collect strands’ orientation angle information during the stranding process

which is crucial for optimizing the production process and improving product performance. This research has important practical applications in the wood-based panel industry and provides a valuable reference for future research in this area.

关键词

定向刨花板卷积神经网络刨花识别定向角度计算模型性能评价

Keywords

oriented strand boardconvolutional neural networkstrand identificationorientation angle calculationmodel performance evaluation

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