## 3 Materials and Methods
### Dataset Creation
#### 3.1.7. Data Preparation  
Once the video annotation was finished, there will be three CSV files as the output from the three annotators. The data preparation is performed as follow:  
1. Part 1 of the CSV file contains the time, name, age, gender, category, table height, chair height and distance. (see Figure 3)
2. Part 2 of the CSV file contains the label of the seven categories (head, neck, shoulders, elbows, wrist, upper back, lower back, and overall). (see Figure 3) * To do this, each of the categories will be com-pared among the three CSV files * If two out of three (2 out of 3) annotators agreed on a label then it will be the overall label for that instance (e.g., Row 2, PT1 = Improper, PT2 = Proper, PT3 = Proper, then the overall label for it is PROPER).
3. This will be repeated on a total of 7200 instances (see the Equation (1) below).  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**No.** & **Landmark** & **Remarks** \\ \hline
1 & **Head** & Eye level with monitor, Not too forward or close to monitor \\ \hline
2 & **Neck** & Neutral (not too bent backward, forward or to the side) \\ \hline
3 & **Shoulders** & Levelled (not raised or rounded) \\ \hline
4 & **Elbows** & Not too flexed or extended \\ \hline
5 & **Wrist** & Slightly extended or neutral. Not too flexed or extended \\ \hline
6 & **Upper Back** & No kyphotic or lordotic posture, or rounded or shifting to one side \\ \hline
7 & **Lower Back** & No kyphotic or rounded or shifting to one side \\ \hline \hline \end{tabular}
\end{table}
Table 5: Posture States Criteria.  
Based on Table 6 below, the total number of instances of the study is 7200. To calculate this, the study captured ten (10) frames per second. Next, annotation was made every ten (10) seconds. A total of one hundred (100) frames were processed in the duration of 10 s. An overall total of ten (10) minutes were collected per sitting posture (proper and improper). So, a total of 6000 frames were processed for proper and another 6000 frames were processed for improper per participant. A total of sixty (60) participants were used in this study. Therefore, a total of 720,000 frames were process overall.  
Since annotation was made every ten (10) seconds, each participant has sixty (60) instances of proper and sixty (60) instances of improper. A total of one hundred twenty (120) instances per participant were collected, since the study has sixty (60) participants, therefore, a total of seven thousand two hundred (7200) instances overall (see Equation (1)).  
As seen on the equation 1 below, a total of sixty (60) participants were gathered and twenty (20) minutes of data gathering for each participant. Twenty minutes has 1200 s but since the annotation will be made for every ten (10) seconds, a total of one hundred twenty (120) in-stances per participant will be recorded. Moreover, multiplying it again on the total number of participants, the overall number of instances is seven thousand two hundred (7200).  
\[6\text{ instances per minute}*10=60\text{ instances per posture}*2=120\text{ instances}*60\text{ participants}=7200\text{ instances} \tag{1}\]  
\begin{table}
\begin{tabular}{p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt}} \hline \hline
**FPS (Frame per Second)** & **Frame per Ten Second** & **Frame per Participant** & **Total \# of Participants** & **Total \# of Fitting Posture** & **Total \# of Frames** \\ \hline
10 & 100 & 6000 & 60 & 360,000 & 720,000 \\ \hline
**\# of Instances per Minute** & **\# of Instances in Ten (10) Minutes** & **\# of Instances per Participant Per Posture** & **Total \# of Participants** & **Total \# of Instances** & \\ \hline
6 & 60 & 120 & 60 & 7200 & \\ \hline \hline \end{tabular}
\end{table}
Table 6: Total # of Frames and Instances.  
Figure 3: Video Annotation File.