baalke@mars.jpl.nasa.gov (Ron Baalke) (01/24/91)
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IMDISP 5.6
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Version 5.6 of the IMDISP program is now available via anonymous ftp.
IMDISP is an interactive image display program with some basic image
processing capabilities that runs on an IBM PC computer. It was originally
written to be used with the Voyager images on CD-ROM's, and an older version
of IMDISP has been distributed with the Voyager CD-ROM's in the past. This
version of IMDISP is the most current one, and has been submitted to be
included on the GRIPS '90 CD-ROM that is coming out shortly.
IMDISP will support various video modes including CGA, EGA, VGA
(recommended), and super VGA (highly recommended) for selected graphics boards.
The program can display images in three formats: PDS/SFDU, FITS and VICAR.
The PDS format was developed by the Planetary Data Systems, and the FITS
(Flexible Image Transport) format is typically used for astrononmy images.
The VICAR (Video Image Communication and Retrieval) format was developed at
the Image Processing Lab at JPL.
Peter Yee at Ames Research Center was kind enough to allow his computer
site be used for anonymous ftp access. This site can be reached at:
ames.arc.nasa.gov (128.102.18.3)
The IMDISP program is stored in a file called IMDISP56.ZIP in the
pub/SPACE/IMDISP subdirectory. This zip file can be unzipped with the public
domain program PKUNZIP. IMDISP56.ZIP has three files in it:
IMDISP.EXE - IMDISP program version 5.6
IMDISP.DOC - User's Guide for IMDISP
PCDCOMP.EXE - Version 2.0 of the Voyager Image Decompression
Program
IMDISP.DOC will help in the use of IMDISP, and has some interesting
overviews of CD-ROM fundamentals and image processing. The PCDCOMP program
is to be used specifically to uncompress the Voyager images stored the CD-ROM
into PDS, FITS or VICAR formats; this is the most recent version.
Being one of the programmers of IMDISP, I am very interested on how
people like the program. If you find any bugs in IMDISP then let me know and
I will see that they get fixed. Also, any suggestions or ideas on improving
the program will be appreciated.
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MAGELLAN IMAGES
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Two raw format Magellan images are also available for anonymous ftp.
The two images are stored at the same Ames site listed above, and are in
the pub/SPACE/VICAR directory under the names DSNALL.IMG and GOLUBKINA.IMG.
The images have been released by the Magellan project at JPL, and are
digital versions of images that have been previously released to the press.
Both images are 8 bit images in VICAR format with a pixel resolution of
1024x1024, and are 1 megabyte in size.
DSNALL.IMG is the "Crater Farm" mosaic which contains 24 orbits of data
formed into one large mosaic. The dominating features in this mosaic are
three huge craters. GOLUBKINA.IMG is a pseudo-oblique view of a crater from
the very first strip of imagery received from Magellan. Note that both these
images can be displayed with the IMDISP program. One thing to keep in mind
when viewing these images, is that they are radar images and are to be
interpreted differently from what we are normally used to seeing. Generally
with radar images, dark areas indicate smooth surfaces, and the lighter areas
indicate the surface is rough. Additional Magellan images will be added as
they become available.
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/_ /| /____/ \ /_ /|
| | | | __ \ /| | | | Ron Baalke | baalke@mars.jpl.nasa.gov
___| | | | |__) |/ | | |___ Jet Propulsion Lab | baalke@jems.jpl.nasa.gov
/___| | | | ___/ | |/__ /| M/S 301-355 |
|_____|/ |_|/ |_____|/ Pasadena, CA 91109 |