Ming FANG, Teng-teng SUN, Zhen SHAO. Fast helmet-wearing-condition detection based on improved YOLOv2[J]. Optics and precision engineering, 2019, 27(5): 1196-1205.
DOI:
Ming FANG, Teng-teng SUN, Zhen SHAO. Fast helmet-wearing-condition detection based on improved YOLOv2[J]. Optics and precision engineering, 2019, 27(5): 1196-1205. DOI: 10.3788/OPE.20192705.1196.
Fast helmet-wearing-condition detection based on improved YOLOv2
Construction sites comprise changeable illumination
complicated backgrounds
and various types of construction personnel
which makes the detection of helmet wearing challenging. To address the problems of low accuracy and poor robustness of traditional detection methods
this paper proposed a method of helmet wearing detection based on deep learning. The proposed method was based on the YOLOv2 target detection
and its network structure was improved. First
utilizing the notion of densely connected networks
dense blocks are added to the original network
which aids in the realization of the fusion of multi-layer features and the combination of shallow low semantic information and deep high semantic information
thereby improving the network sensitivity to enable the detection of small targets. Subsequently
the lightweight network structure in MobileNet was used for network compression
thus reducing the size of the model to one tenth of its original and also increasing model availability. The improved network model was trained and tested on the self-made HelmetWear dataset and compared with the original as well as the latest YOLOv3. The obtained results show that the detection accuracy of the model is 87.42%
which is slightly lower than that of YOLOv3
but its detection speed is significantly improved
i.e.
37% and 215% higher than that of YOLOv2 and YOLOv3
respectively
while reaching 148 frames/s. Experiments confirm that the proposed model can effectively reduce parameter quantity and significantly enhance detection speed while ensuring detection accuracy.
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