In XCOSM version 2.3 the appropriate routines for the computation of the
confocal PSF have been modified to correct inaccurate PSF values computed
when the PSF is undersampled, i.e. when the pixel size is larger than the
Nyquist's sampling rate. Also linear interpolation used in the PSF computation
has been replaced with cubic spline interpolation which provides more accurate
results. We note that bandlimited interpolation (using sinc functions)
yields the most accurate results but because of the increase in the computational
time we opted for the cubic interpolation instead).
3/6/00 :
The following problems with the GUI have been reported for XCOSM running
under Linux in general:
-Choosing "Help" from XCOSM menu causes "segmentation fault"
-Unloading images from the display causes "segmentation fault"
Also for Linux on a Pentium II problems with the PSF computation were reported
as well.
9/15/99 :
The program 'xcosm_psf.c' has been modified to correct inaccurate PSF
values computed when the PSF is undersampled, i.e. when the pixel size
is larger than the Nyquist's sampling rate. This problem has been corrected
for the widefield and 2-photon PSF but not for the confocal PSF. Any upload
of the package after this date will contain the correct code. Correction
for the confocal PSF will follow soon. Also note that the ftp site bcl.wustl.edu
is no longer available; the xcosm package is only available through this
web site.
8/8/95 :
An error was found in the file 'xcosm_em.c.' Any upload of the package
after this date will contain the correct code. For anyone with the old
version you can get the file xcosm_em.c via anonymous ftp from bcl.wustl.edu
in the pub/COSM directory. Also, in early versions of the package, a file
called 'udsample.c' was not included. If you do not have this file, it
is needed for the new xcosm_em code and can also be retrieved via the ftp
site above.
6/29/95 :
Value WU_MAXDIM in XCOSM/washu.h and XCOSM/UTILS/washu.h
is too small (2048) for generating PSFs of certain sizes. Changed to 10000
in newest release.
For persons with the older version, just change this value and recompile
the package.