Cut tobacco width plays an essential role in the production of the cigarette industry. Current cut tobacco mainly has a width in the range of 0.9 mm, 0.95 mm, and 1.05 mm. With the increase of cut width, the proportion of medium, as well as long filaments in the final products, will increase. In contrast, when the proportion of short and broken shreds decreases, the structural distribution stability of the final products will increase as well. However, if the cut leaf is too wide, the rolled cigarettes tend to be empty, resulting in low flammability and slow ignition speed. Therefore, an online closed-loop control system of cutting machines based on high speed and accurate measurement of the cut tobacco width is a valuable but challenging problem in the modern cigarette industry. This paper proposes a purely nondestructive width measurement method by applying machine vision techniques and machine learning methods for industrial applications. First, the skeleton method and Hough line detection are integrated to achieve a sub-pixel measurement of cut tobacco. Then a global calibration method is implemented to map the measurement result from the image coordinate to a real-world distance. Our experimental results demonstrate that the proposed tobacco width measurement method has the characteristics of a low error rate as well as real-time execution efficiency.
In construction, coal mining, tobacco manufacturing and other industries, wearing helmets is crucial safety measure for workers, and the monitoring of helmet wearing plays a significant role in maintaining production safety. However, manual monitoring demands substantial human, material and financial resources, and will suffer from low efficiency and are error prone. Therefore, we proposed a lightweight real-time deep learning-based detection framework called YOLO-H, for automatic helmet wearing detection. Our YOLO-H model was developed on the foundation of YOLOv5-n by introducing the state-of-the-art techniques such as re-parameterization, decoupled head, label assignment strategy and loss function. Our proposed YOLO-H performed more efficiently and effectively. On a private dataset, our proposed framework achieved 94.5% mAP@0.5 and 65.2% mAP@0.5:0.95 with 82 FPS (Frames Per Second), which surpassed YOLOv5 by a large margin. Compared to other methods, our framework also showed overwhelming performance in terms of speed and accuracy. More importantly, the developed framework can be applied to other object detection scenarios.
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