Id |
Subject |
Object |
Predicate |
Lexical cue |
T433 |
0-4 |
Sentence |
denotes |
5.7. |
T434 |
5-39 |
Sentence |
denotes |
Risk Calculation and Visualization |
T435 |
40-171 |
Sentence |
denotes |
To demonstrate risk calculation using Equation (2), we evaluated the proposed IoCT using the following cleaning use case scenarios. |
T436 |
172-338 |
Sentence |
denotes |
In meeting room number 326 of the CCIT building, the number of people increased as people entered the room, and this event was detected by a smart camera in the room. |
T437 |
339-478 |
Sentence |
denotes |
The number of people was shown online in the video frame and map visualization browser in green until the room capacity (five) was reached. |
T438 |
479-611 |
Sentence |
denotes |
When the fourth person came in (room capacity is assumed to be three), the alarm notification for “Room exceeded capacity” is shown. |
T439 |
612-733 |
Sentence |
denotes |
After that, a person coughed in the meeting room, and this event was detected by both the smart camera and audio sensors. |
T440 |
734-773 |
Sentence |
denotes |
A notification showed “Cough detected”. |
T441 |
774-867 |
Sentence |
denotes |
Then, the person who coughed opened the door and this event was detected by the smart camera. |
T442 |
868-923 |
Sentence |
denotes |
A “High-risk behavior detected” notification was shown. |
T443 |
924-1054 |
Sentence |
denotes |
The risk profile at that moment exceeded the threshold of 0.7 and a notification was sent to the people in room, and to a cleaner. |
T444 |
1055-1219 |
Sentence |
denotes |
The color of the room polygon turned red indicating high risk and the room polygon was extruded (i.e., the polygon height increases) proportional to the risk value. |
T445 |
1220-1385 |
Sentence |
denotes |
People started to leave the room causing the risk from People Density to go down, but the risk is higher than at the very beginning as a coughing event had occurred. |
T446 |
1386-1508 |
Sentence |
denotes |
The total risk value of the meeting room falls but remains higher than before the risky behavior (i.e., cough) took place. |
T447 |
1509-1668 |
Sentence |
denotes |
The cleaner closer to the room changes his activity status to cleaning (shown by an icon on the map) and moves closer towards the room (from elevator to room). |
T448 |
1669-1779 |
Sentence |
denotes |
The cleaner trajectory alongside the other people trajectories extracted from BLE beacons were visualized too. |
T449 |
1780-1916 |
Sentence |
denotes |
After the cleaning activity, the room’s total risk level goes back down to zero and the color of the room polygon changes back to green. |
T450 |
1917-2030 |
Sentence |
denotes |
The video demo of this scene is attached in the Supplementary Materials which shows the risk profile of the room. |
T451 |
2031-2120 |
Sentence |
denotes |
A sample screen shot of the Supplementary Materials demo video is presented in Figure 14. |
T452 |
2121-2271 |
Sentence |
denotes |
To evaluate the impact of various weights assigned to different map layers, we used two sets of weights for map layer aggregations on the client side: |
T453 |
2272-2376 |
Sentence |
denotes |
Profile 1: W1=W2=W3=W4=1; and Profile 2: W1=0.1, W2=0.4, W3=0.3, and W4=0.2 as mentioned in Section 4.1. |
T454 |
2377-2453 |
Sentence |
denotes |
Figure 15 shows two risk profiles for room 326 over 40 min from 20:00 to 20: |
T455 |
2454-2478 |
Sentence |
denotes |
40 p.m. on 11 June 2020. |
T456 |
2479-2626 |
Sentence |
denotes |
Evaluating precision, recall, and F-Score of video-Based and audio-Based risky behavior detection are listed in in Table 5 and Table 7 accordingly. |
T457 |
2627-2919 |
Sentence |
denotes |
Table 8 includes time performance of different developed functionalities (e.g., video-based person density, video-based physical distancing, video-based risky behavior detection, and audio-based risky behavior detection) on various platforms such as Jetson NX, laptop, and android smartphone. |
T458 |
2920-3025 |
Sentence |
denotes |
The performance of using a deep learning engine is highly dependent on Graphics and Computing processors. |
T459 |
3026-3137 |
Sentence |
denotes |
Therefore, the performance of those functionalities is evaluated on a laptop with more robust processing units. |
T460 |
3138-3225 |
Sentence |
denotes |
The laptop has NVIDIA GeForce RTX 2070 with 7.5 computation capabilities and a Core i7. |
T461 |
3226-3294 |
Sentence |
denotes |
Therefore, the performance on Jetson NX is lower than on the laptop. |
T462 |
3295-3416 |
Sentence |
denotes |
The best performance values are video-based risky behavior detection because they only involve the object detection task. |
T463 |
3417-3539 |
Sentence |
denotes |
Audio-based risky behavior detection segments the voice in specific time frames and converts them into spectrogram images. |
T464 |
3540-3598 |
Sentence |
denotes |
Voice patterns are detected in images using the VGG model. |
T465 |
3599-3681 |
Sentence |
denotes |
Therefore, the time of processing for audio is higher than video object detection. |
T466 |
3682-3849 |
Sentence |
denotes |
Video-based people density and video-based physical distancing give worse performance values than simple object detection regarding complexities in tracking functions. |