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==Background image generation==
===Equations===
# For three frames of image sequence <math>x_1</math>, <math>x_2</math>, and <math>x_3</math>, the background image <math>B</math> is obtained using
::: <math>B = x_3(x_1\oplus x_2)+x_1x_2 </math><ref name="TF" /> #The Boolean mode function <math>S</math> of the table occurs when the number of 1 entries is larger than half of the number of images such that<ref name="TF" /><br> <math>S=\begin{cases} 1, & \text{if } \sum_{i=1}^n x_i\ge\left \lceil \frac n 2 + 1 \right\rceil, \text{ and } n\ge 3 \\
0, &\text{otherwise} \end{cases}</math>
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