How to center the caption in onecolumn space?

Question

I used the commands \onecolumn and \twocolumn to have some images in one column, but now the images' captions are not centered. How can I solve this problem?

My code is like below:

\one column

\begin{figure}[p]

\centering

....

\caption{...}

\label{fig:...}

\end{figure}

\twocolumn

Addendum: A full MWE is:

\documentclass[journal]{IEEEtran}     
\usepackage{times,amsmath,epsfig,amssymb,graphicx,amsfonts,pxfonts,txfonts,float‌​} 
\usepackage{subfigure,ifpdf,cite} 
\begin{document} 
\begin{figure*}[p] 
\centering \subfigure[] 
{\label{fig:Original}
   \includegraphics[width=70mm]{Lena.pdf}}% 
\label{fig:image} 
\end{figure*} 
\nocite{*} 
\bibliographystyle{IEEEtran} 
\bibliography{meee} 
\end{document}

Answer 1

If you are preparing a paper for a journal and the journal requests you to use the IEEEtran class with the journal class option, then captions for figures won't be centered by design, and I suggest you to leave them as they are. If you're not forced to use the journal option for IEEEtran, then simply load the class with the conference option (by deafult, one-line figure captions will now be centered):

\documentclass[conference]{IEEEtran}