How to vertically align 3 images with subfigure?

I simply couldn't pass this one by, if only just to produce a solution that makes note of the obvious similarities between the sample provided and the classic Tron Guy.

The actual solution uses subfig package, but who cares.

\documentclass[10pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}
\usepackage[labelsep=quad,indention=10pt]{subfig}
\captionsetup*[subfigure]{position=bottom}
\begin{document}
    \begin{figure}[h]
        \centering
           \subfloat[Frontal view]{%
              \includegraphics[height=5cm]{tron_side.jpg}%
              \label{fig:left}%
           } 
           \subfloat[Perspective view]{%
              \includegraphics[height=5cm]{tron_front.jpg}%
              \label{fig:middle}%
           }
           \subfloat[Side view]{%
              \includegraphics[height=5cm]{tron_right2.jpg}%
              \label{fig:right}%
           }
           \caption{Overview of the sensor system as worn by the subjects.}
           \label{fig:default}
    \end{figure}    
\end{document}

The interface provided by the subfigure package, specifies the first (optional) argument to indicate the vertical alignment. Using [b] should align be bottom of the sub figures. Analogously, [t] should align the tops.

Instead of numbering the captions manually

\caption{a) ...}

you could use the accompanying \subfigure command:

\subfigure{...}

and change the format of the numbering to your liking.

I found this code:

\begin{figure}
\subfigure{\includegraphics[width=67mm]{PipeScannerUnderGround}}
\subfigure{\raisebox{10mm}{\includegraphics[width=47mm]{CylScanGeometryPipe}}}
\caption{}
\end{figure}

here

Worked perfectly :)

Use \usepackage{subfigure} in the preamble