Fig. 1

Four-dimensional model of digital twin escalator passenger behavior monitoring system

Fig. 2

Construction of escalator virtual scene

Fig. 3

OpenPose frame

Fig. 4

2D vector field of attitude key points

Fig. 5

Flow chart of human posture recognition and monitoring system

Fig. 6

I-OpenPose framework fusion diagram

Fig. 7

COCO dataset human key point annotation

Fig. 8

Data enhancement in digital twin virtual environment

Fig. 9

Virtual character behavior construction process in digital twin

Fig. 10

Virtual human behavior of human pose classification results

Table 1

Response time of each part of monitoring system s

Fig. 11

I-OpenPose pose recognition results

Table 2

Comparison of attitude recognition effect of bottom-up method

Fig. 12

Attitude recognition results for occlusion and overlap

Fig. 13

Attitude recognition results of background color aliasing

Fig. 14

Passenger behavior monitoring interface

Table 3

Human body posture recognition results

Table 4

Accuracy of SVM classification verification

Fig. 15

Actual image data to validate the classifier