为什么第一张图像没有正确对齐？

Question

我想将四张图片放在水平线上，但第一张图片没有像其他三张图片一样对齐。我仅针对图像部分的代码如下：

\begin{figure}[h]
  \centering
  \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/testImages/104055.jpg}
     \caption{Imaginea originala}
  \end{subfigure}
  \begin{subfigure}{0.24\textwidth}
  \centering
    \includegraphics[width=\textwidth]{images/testImages/groundTruth104055.jpg}
     \caption{Imaginea ground-truth}
  \end{subfigure}
  \centering
    \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/testImages/imageResult104055.jpg} 
     \caption{Rezultatul metodei propuse.}
  \end{subfigure}
  \begin{subfigure}{0.24\textwidth}
  \centering
    \includegraphics[width=\textwidth]{images/cannyImage/canny104055.jpg}
     \caption{Rezultatul metodei Canny.}
  \end{subfigure}
\end{figure}
\begin{figure}
  \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/testImages/163014.jpg}
    \caption{Imaginea originala.}
  \end{subfigure}
  \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/testImages/groundTruth163014.jpg}
    \caption{Imaginea ground-truth.}
  \end{subfigure}
  \centering
    \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/testImages/imageResult163014.jpg} 
      \caption{Rezultatul  metodei propuse.}
  \end{subfigure}
  \centering
  \begin{subfigure}{0.24\textwidth}
    \includegraphics[width=\textwidth]{images/cannyImage/canny163014.jpg}
      \caption{Rezultatul metodei Canny.}
  \end{subfigure}
\end{figure}

结果是：

Answer 1

[t]在每个后面添加选项\begin{subfigure}。这将使图像与其底线对齐。

\documentclass{article}
\usepackage[textwidth=15cm]{geometry}
\usepackage{graphicx}
\usepackage{subcaption}
\begin{document}
\begin{figure}
  \centering
  \begin{subfigure}[t]{0.24\textwidth}
    \includegraphics[width=\textwidth]{example-image}
     \caption{Imaginea originala}
  \end{subfigure}
  \begin{subfigure}[t]{0.24\textwidth}
  \centering
    \includegraphics[width=\textwidth]{example-image}
     \caption{Imaginea ground-truth}
  \end{subfigure}
  \centering
    \begin{subfigure}[t]{0.24\textwidth}
    \includegraphics[width=\textwidth]{example-image} 
     \caption{Rezultatul metodei propuse.}
  \end{subfigure}
  \begin{subfigure}[t]{0.24\textwidth}
  \centering
    \includegraphics[width=\textwidth]{example-image}
     \caption{Rezultatul metodei Canny.}
  \end{subfigure}
\end{figure}
\end{document}