1 \chapter{The Web Interface}\label{webinterface}\index{Web interface}%
2 \setheader{{\it CHAPTER \thechapter}}{}{}{\ctsimheadtitle}{}{{\it CHAPTER \thechapter}}%
6 \ctsim\ can also be executed via a web browser. The Perl program
7 \texttt{ctsim.cgi} takes projections of a standard phantom object,
8 performs reconstruction, and then compares the rasterized phantom
9 object with the reconstruction. The comparison is performed both
10 visually by an image subtraction as well as by statistical
13 The \texttt{ctsim.cgi} program is invoked from the HTML file
14 \texttt{simulate.html}.
16 \section{Requirements}
17 \begin{itemize}\itemsep=0pt
18 \item \urlref{Apache}{http://www.apache.org} or other CGI-compatible web server
20 \item Perl (version 4.0 or higher)
22 \item A client web browser than can display PNG files. Most
23 current web browsers support PNG.
25 \item A knowledgable system administrator.
28 \section{Installation}
29 Installation is rather automatic on Linux and UNIX systems. The
30 \texttt{configure} script needs to be given options that specify
31 the directory for web pages and for CGI programs.