如何将框架的背景颜色更改为默认颜色？

Question

我将框架分成两列，一列包含文本，另一列包含图形。但是，这样做之后，框架的背景颜色发生了变化。我该如何解决？

\begin{frame}{Rotation-invariant code generation and row vector formation}
    \begin{columns}[T]
        \begin{column}{.5\textwidth}
            \begin{block}{}
                \begin{itemize}
                    \item The matching performance can be affected by rotation in the input samples 
                    \item 512 column can be considered as 360 degree \cite{encode}
                    \item One column rotation is 360/512 = 0.703125 
                    \item 8 column rotation: 8 $\times$ 0.703125 = 5.625
                    \item IrisCode of size 64 $\times$ 512, difficult to handle rows and column wise 
                    \item Convert it into row vector
                \end{itemize}
            \end{block}
        \end{column}
        \begin{column}{.5\textwidth}
            \begin{block}{}
                \begin{figure}[!htp]
                    \centering
                    \includegraphics[width=0.90\textwidth]{Bilder/1.pdf}
                    \caption{Rotation in templates}
                \end{figure}%
            \end{block}
        \end{column}
    \end{columns}
\end{frame}

Answer 1

浅蓝色背景来自您放置内容的块。如果您不想要它，就不要使用块。

\documentclass{beamer}

\begin{document}

\begin{frame}{Rotation-invariant code generation and row vector formation}
    \begin{columns}[T]
        \begin{column}{.5\textwidth}
%            \begin{block}{}
                \begin{itemize}
                    \item The matching performance can be affected by rotation in the input samples 
                    \item 512 column can be considered as 360 degree \cite{encode}
                    \item One column rotation is 360/512 = 0.703125 
                    \item 8 column rotation: 8 $\times$ 0.703125 = 5.625
                    \item IrisCode of size 64 $\times$ 512, difficult to handle rows and column wise 
                    \item Convert it into row vector
                \end{itemize}
%            \end{block}
        \end{column}
        \begin{column}{.5\textwidth}
%            \begin{block}{}
                \begin{figure}
                    \centering
                    \includegraphics[width=0.90\textwidth]{example-image}
                    \caption{Rotation in templates}
                \end{figure}%
%            \end{block}
        \end{column}
    \end{columns}
\end{frame}

\end{document}