## 3 Materials and Methods
### Dataset Creation
#### 3.1.3 Data Gathering  
Data Capturing Tool  
* The data gathering is composed of three cameras--two mobile phones positioned at the lateral (left and right) of the participant and one web camera positioned in the anterior of the participant for a web conference call with the experts (Licensed Physical Therapists).
* The smartphones minimum specifications in capturing the videos are:
* 1280 \(\times\) 720 resolution
* 30 fps
* The web conference call was made using a Zoom Meeting. The conference call is essential for the Licensed Physical Therapists (PTs) to facilitate the data gathering procedures and check the sitting posture every ten (10) minutes.  
\begin{table}
\begin{tabular}{c c c} \hline
**Common Features** & **Abbreviation Used in the Study** & **Remarks (Layman’s Terms)** \\ \hline Sternocleidomastoid Process (right) & SPR & Neck Right \\ Brachioradialis (right) & BR & Elbow Right \\ Deltoids (right) & DR & Shoulder Right \\ Trapezius muscle (right) & TMR & Upper Back Right \\ Sternocleidomastoid Process (left) & SPL & Neck Left \\ Brachioradialis (left) & BL & Elbow Left \\ Deltoids (left) & DL & Shoulder Left \\ Trapezius muscle (left) & TML & Upper Back Left \\ Nose & N & Nose \\
**Additional Feature** & & \\ Mentalis & C & Chin \\ Lumbar & L & Lower Back \\ Thoracic & T & Upper Mid Back \\ Thoracic-lumbar & TL & Middle Back \\ \hline \end{tabular}
\end{table}
Table 4: List of Keypoints.  
\begin{table}
\begin{tabular}{c c c c c} \hline  & **Height** & **Wrist Size** & **Category** & **No. of Participants** \\ \hline \multirow{4}{*}{**Female**} & \multirow{4}{*}{\(5^{\prime}2^{\prime\prime}\) or less tall} & \(<\)5.5\({}^{\prime\prime}\) & Small & 5 \\  & & 5.5\({}^{\prime\prime}\) to 5.75\({}^{\prime\prime}\) & Medium & 5 \\  & & \(>\)5.75\({}^{\prime\prime}\) & Large & 5 \\  & & \(<\)6\({}^{\prime\prime}\) & Small & 5 \\
**Female** & \(5^{\prime}2^{\prime\prime}\) to \(5^{\prime}5^{\prime\prime}\) tall & 6\({}^{\prime\prime}\) to 6.25\({}^{\prime\prime}\) & Medium & 5 \\  & & \(>\)6.25\({}^{\prime\prime}\) & Large & 5 \\  & & \(<\)6\({}^{\prime\prime}\) & Small & 5 \\
**Male** & \(5^{\prime}5^{\prime\prime}\) or less tall & 6\({}^{\prime\prime}\) to 6.25\({}^{\prime\prime}\) & Medium & 5 \\  & & \(>\)6.25\({}^{\prime\prime}\) & Large & 5 \\  & & \(<\)6.25\({}^{\prime\prime}\) & Small & 5 \\
**Male** & taller than 5\({}^{\prime}5^{\prime\prime}\) & 6.25\({}^{\prime\prime}\) to 6.5\({}^{\prime\prime}\) & Medium & 5 \\  & & \(>\)6.5\({}^{\prime\prime}\) & Large & 5 \\ \hline \end{tabular}
\end{table}
Table 3: Body Frame Category.  
* The two mobile phone cameras positioned in the lateral is essential for livestreaming purposes so that the experts will be able to see the movements of the participants in real-time. This has been achieved using server-client network wherein these two mobile phones were connected into a single server and using a web browser, the experts will be able to access and see the videos.
* At the same time, the two mobile phones captured videos will be saved and recorded for feature extraction purposes later. Since some of the participants are working individuals, audio will not be part of the video as there are some confidential information could be leaked in the duration of the data gathering.