## 3 Results
In this case, the view's space refers to the designated area where users are allowed to write with a stylus or their finger on the tablet screen. Following that, the data in Table 5 show that intra-person variability is consistently lower than inter-person variability for relative position measurements regardless of whether a stylus or finger is used. \begin{table}
\begin{tabular}{l l l l l l} \hline \hline  & & \multicolumn{3}{c}{**Stylus**} & \multicolumn{2}{c}{**Finger**} \\ \hline
**Measurement** & **Axis** & **Intra-Person** & **Inter-Person** & **Intra-Person** & **Inter-Person** \\ \hline \multirow{4}{*}{Gyroscope [rad/s]} & X & 244.18 & 541.28 & 210.34 & 408.35 \\ \cline{2-6}  & Y & 94.49 & 215.95 & 109.69 & 246.60 \\ \cline{2-6}  & Z & 91.60 & 196.48 & 81.02 & 174.83 \\ \cline{2-6}  & Magnitude & 198.83 & 495.22 & 162.89 & 405.33 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Analysis of intra-person and inter-person differences in writing with a stylus versus a finger based on gyroscope data. Each of the 5 participants wrote the phrase ’We trust you’ in 5 distinct trials. Figure 9: The number of stylus gestures 4 users performed in 5 trials to write the phrase “_We trust you_”. The period of writing is shown in blue, while the white spaces indicate the writing pauses. Due to the limited nature of the S Pen stylus API, we encountered limitations in obtaining the required data from the gyroscope and accelerometer sensors. Hence, we included an ArUco marker on the stylus's end to acquire data on the stylus's inclination whilst writing on the tablet. The output consists of the X and Y coordinates of the ArUco marker readings extracted from the videos utilizing our proprietary script. It automatically trims the video based on the recorded timestamp, since the video is continuous. Separate segments representing a single record pertaining to a letter, word, sentence, or signature are obtained in this manner. The coordinates of the detected ArUco marker are subsequently written in a text file. Figure 10 demonstrates diverse stylus tilt measurements based on the attempts of multiple users with noticeable consistency when the same user holds the stylus. While the readings for the same individual may be slightly inconsistent, there is a noticeable distinction among various subjects. The numbers in Tables 6 and 7 indicate a clear difference between intra-person and inter-person variability for stylus tilt readings with intra-person variability being lower for both rotation and translation vectors. For the magnitude of the rotation vector, the intra-person variability is 1.62, while the inter-person variability is much higher at 6.78, which is more than four times greater. Similarly, for the magnitude of the translation vector, the intra-person variability is 1.94 compared to an inter-person variability of 8.07, which is also over four times higher. These comparisons underscore that measurements are much more consistent within individuals than between different people. Furthermore, the _Stylus orientation_ parameter measures the angle of the touch region and tool area, such as a stylus, in radians, indicating the direction relative to the vertical axis. It reflects the alignment of the touch event or gesture. Table 8 presents the variability in orientation measurements using a stylus. The intra-person variability is 0.28, which is lower compared to the inter-person variability of 2.76. No data are available for finger usage in this context. This indicates that orientation measurements are much more consistent within individuals than between different people when using a stylus. Figure 11 illustrates magnetometer measurements for the X, Y, and Z axes obtained from the tablet device in five trials conducted by three distinct users. Powerful neodymium magnets were used to cause interference with the magnetic field. They were identical in size and characteristics, and they were affixed to the end of the stylus and the ring to enable placement on the user's finger.