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<H2><A NAME="SECTION00691000000000000000"> </A> <A NAME="2583"> </A>
<BR>
Using Catalogs in MIDAS Procedures
</H2>
<P>
Assume we have written a specific application program, <TT>pearl</TT>, within the
MIDAS environment, that processes an input image and produces some numbers as
a result.
We would like this program also to work on a
sequence of images, not just on one input image:
<BLOCKQUOTE>
<TT>!+ <BR>
! Example 20, MIDAS procedure exa20.prg <BR>
!+ <BR>
DEFINE/LOCAL CATAL/I/1/1 0 </TT>! define local key CATAL<TT> <BR>
! <BR>
LOOP: <BR>
STORE/FRAME IN_A </TT><IMG
WIDTH="16" HEIGHT="44" ALIGN="MIDDLE" BORDER="0"
SRC="img215.gif"
ALT="$\{$"><TT>P1</TT><IMG
WIDTH="17" HEIGHT="44" ALIGN="MIDDLE" BORDER="0"
SRC="img216.gif"
ALT="$\}$">! fill key IN_A with parameter 1<TT> <BR>
RUN pearl </TT>! run our application<TT> <BR>
GOTO LOOP </TT></BLOCKQUOTE>If P1 contains the name of an image,
the command <TT>STORE/FRAME</TT> works exactly <BR>
like <TT>WRITE/KEYWORD</TT>. The keyword CATAL is not modified.
<BR>
However, if P1 contains the name of a catalog
of the form
<I>file.cat</I>, this catalog
is opened and the first entry in the catalog is stored into
the keyword IN_A.
<BR>
The number of the next entry is saved in the keyword
CATAL (so this name is fixed!). In the loop, the entry number is taken from
CATAL and the corresponding frame name put into keyword IN_A (in our
example). If there are no more entries in the catalog, control is either
transferred
to a label which may be specified in the command line of <TT>STORE/FRAME</TT>
or if not given, the procedure is terminated.
<BR>
So <TT>@@ exa20 myframe</TT> will work on the single frame <TT>myframe</TT>, <BR>
whereas
<TT>@@ exa20 mycatal.cat</TT> works on all frames with entries in
the image catalog <TT>mycatal.cat</TT>.
<BR>
<BR>
If the program <TT>pearl</TT> produces also output frames, you should not
have the catalog enabled (cf. <TT>SET/ICAT</TT> command).
Because each new frame gets added to the enabled catalog
and you would end up with an infinite loop!
<BR>
<BR>
Furthermore you may write your application and procedure just to work on
single frames and then execute this procedure on all frames in a catalog
via the command
<TT>EXECUTE/CATALOG</TT>. Note, that you have to set up some
special keywords in advance for that via <BR>
<TT>WRITE/SETUP CATALOG</TT>; for details see the HELP of <TT>EXECUTE/CATALOG</TT>.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
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