## 4 Results and Analysis
### Experimental Analysis Based on Multi-Level Thresholding
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Level**} & \multirow{2}{*}{**Image**} & \multirow{2}{*}{**OOSGO**} & \multicolumn{2}{c}{**OWO**} & \multicolumn{2}{c}{**SCSO**} & \multicolumn{2}{c}{**WWA**} & \multicolumn{2}{c}{**ACWW,CS**} & \multicolumn{2}{c}{**PSOGSA**} \\  & & **Ozone** & **Keeper** & **Ozone** & **Keeper** & **Ozone** & **Keeper** & **Ozone** & **Keeper** & **Ozone** & **Keeper** & **Ozone** & **Keeper** & **Ozone** & **Keeper** \\ \hline \multirow{4}{*}{**118001**} & Value & -18,750.87 & -5.15 & -18,750.74 & -5.15 & -18,750.87 & -5.15 & -18,750.84 & -5.15 & -18,750.88 & -5.15 & -18,750.87 & -5.15 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.29 & 0.00 & 0.00 & 0.00 & 0.05 & 0.00 & 0.33 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & Value & -60,400.56 & -5.04 & -60,54.56 & -5.04 & -60,54.56 & -5.04 & -60,54.52 & -5.04 & -60,53.99 & -5.04 & -60,54.36 & -5.04 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.00 & 0.00 & 0.04 & 0.00 & 0.05 & 0.00 & 0.33 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & Value & -60,504.04 & -4.88 & -60,54.03 & -4.88 & -60,54.52 & -4.88 & -60,54.58 & -4.88 & -60,540.16 & -4.88 & -60,540.16 & -4.88 & -60,540.16 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 \\ \hline \multirow{4}{*}{**233003**} & Value & -27,071.32 & -5.22 & -27,071.70 & -5.22 & -27,071.71 & -5.22 & -27,071.54 & -5.22 & -27,070.76 & -5.22 & -27,071.72 & -5.22 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.04 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.04 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & Value & -13,184.31 & -4.99 & -15,183.55 & -4.99 & -15,183.51 & -4.99 & -15,183.08 & -4.99 & -15,183.08 & -4.99 & -15,183.08 & -4.99 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 1.67 & 0.00 & 0.00 & 0.00 & 0.00 & 0.01 & 0.00 & 0.05 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & Value & -12,611.56 & -4.65 & -12,641.96 & -4.65 & -12,641.96 & -4.65 & -12,641.96 & -4.65 & -12,641.91 & -4.65 & -12,641.96 & -4.65 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & STD & -15,314.54 & -5.16 & -15,323.38 & -5.16 & -15,323.53 & -5.16 & -15,323.84 & -5.16 & -15,320.17 & -5.16 & -15,320.14 & -5.16 \\ \hline \multirow{4}{*}{**81005**} & STD & 0.00 & 0.00 & 0.35 & 0.00 & 0.00 & 0.01 & 0.00 & 0.06 & 0.00 & 0.00 & 0.00 & 0.00 \\ \cline{2-13}  & STD & -15,750.47 & -4.55 & -5.15 & -5.15 & -17,070.0 & -4.55 & -15,071.08 & -4.55 & -15,070.23 & -4.55 & -15,070.19 & -4.55 \\ \cline{2-13}  & STD & 0.04 & 0.00 & 0.05 & 0.00 & 0.00 & 0.00 & 0.02 & 0.00 & 0.00 & 0.00 & 0.01 & 0.00 \\ \cline{2-13}  & Value & -17,648.03 & -5.48 & -17,683.43 & -5.48 & -17,685.42 & -5.48 & -17,685.42 & -5.48 & -17,684.14 & -5.48 & -17,684.14 & -5.48 & -17,685.43 & -5.48 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.03 & 0.13 & 0.00 & 1.18 & 0.00 & 0.00 & 0.00 \\ \hline \multirow{4}{*}{**36002**} & Value & -13,124.65 & -5.16 & -16,183.465 & -5.16 & -16,124.65 & -5.16 & -16,124.65 & -5.16 & -16,124.65 & -5.16 & -16,124.65 & -5.16 & -16,124.65 & -5.16 \\ \cline{2-13}  & STD & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.04 & 0.00 & 0.07 & 0.00 & 0.00 & 0.00 \\ \hline \hline \end{tabular}
\end{table}