latex图片居中代码示例：\begin{figure*}[!t]\centering\centerline{\includegraphics[width=3.3in]{Medical Image Steganography by Lossless Soft Compression and Adaptive n-LSB/images/figure5.pdf}}\caption{Simulation result of the embedding and extracting processes for color images in different datasets.}\label{fig: embedding and extracting}\end{figure*}