Wearing safety harness is essential for workers when carrying out work. When posture of the workers in the workshop is complex, using real-time detection program to detect workers wearing safety harness is challenging, with a high false alarm rate. In order to solve this problem, we use object detection network YOLOv5 and human body posture estimation network OpenPose for the detection of safety harnesses. We collected video streams of workers wearing safety harnesses to create a dataset, and trained the YOLOv5 model for safety harness detection. The OpenPose algorithm was used to estimate human body posture. Firstly, the images containing different postures of workers were processed to obtain 18 skeletal key points of the human torso. Then, we analyzed the key point information and designed the judgment criterion for different postures. Finally, the real-time detection program combined the results of object detection and human body posture estimation to judge the safety harness wearing situation within the current screen and output the final detection results. The experimental results prove that the accuracy rate of the YOLOv5 model in recognizing the safety harness reaches 89%, and the detection method of this study can ensure that the detection program accurately recognizes safety harnesses, and at the same time reduces the false alarm rate of the output results, which has high application value.
This paper studied the mechanism of a multi-wheel intelligent-surmounting obstacle vehicle and its principal controlling technical routine with single chip CPU. The model vehicle mounted many wheels with gear transmission; the controlling system use Freescale 16 bites MC9S128 single chip CPU as the core controlling unit, some touching switches used as obstacle detection sensor. By effective signal treatment, the basic function of the vehicle, such as steering engine turning, rod lifting, wheel backward retraction and return after over obstacle is performed correspondingly. The experiment shows that this model vehicle can realize automatic surmounting obstacle without moving direction change through multi-wheel coordination.
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