ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

144 CHAPTER 14. IMAGE ANALYSIS AND DISPLAY
14.4.12 Cube animation with xmovie
An animated movie of all the images in an IDL cube can be displayed with xmovie. Thecube
can be taken directly from a CIA data structure, for example the .CUBE from a PDS:
CIA> xmovie, cvf_pds.cube
Onenoteofwarning: sincexmovie needs a lot of memory to perform the animation, a large
cube may crash it. Don’t worry, your data should not be affected.
14.5 Simple image display
14.5.1 tviso
The simplest form of image display is with tviso. The purpose of this routine is to display a
single image and intensity scale in an IDL window. All images are rebinned to 320 × 320 for
visualisation. Its calling sequence is simple:
tviso, image
14.5.2 Cube display with show frame
All the frames in an IDL cube can be displayed in a single window with the routine show frame
– see Figure 14.15. Each frame can be enlarged by clicking on it. If there are too many frames
to fit in the window, you can scroll through the cube by clicking on the buttons previous or
next. Clicking on postscript produces a postscript file of the window. The button colour invokes
xloadct and the button clone clones the show frame widget.
As an example, since the EXPOSUREs from a CVF PDS is essentially an IDL cube, a call
to show frame could be:
CIA> show_frame, cvf_pds.image
14.6 Image comparison and overlaying
Astronomers may find it useful to do counterpart comparison and overlaying of images. In
general the counterpart will be optical and the Digitized Sky Survey (see Section 14.6.1) provides
suitable optical images for comparison with CAM images. If you have your own source of images,
in FITS format, then these will do just as well. CIA provides isocont (see Section 14.6.2) to
help you visualise overlays of FITS images and/or CAM images.
14.6.1 Obtaining images from the Digitized Sky Survey
Your site may possess the DSS CD-ROM set. If so, ask your CIA administrator for information
on accessing the CD-ROMs. Alternatively, DSS images can be retrieved from the on-line
ESO/ST-ECF archive.
• To obtain a DSS image from the on-line ESO archive point your WWW browser at:
http://arch-http.hq.eso.org/cgi-bin/dss