| ENVI stats report very, very slow [message #13497] |
Mon, 16 November 1998 00:00 |
Robert Estes
Messages: 1
Registered: November 1998
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Junior Member |
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I'm just starting with ENVI and am finding that some operations are very
very slow. I generated a stats file (covariance, histograms, etc.) for a
256 x 256 x 224 x 16 bit set of image data (subset of Moffat Field AVIRIS
data). The process of generating a report from the *.sta file takes three
hours ... with no significant disk activity. I'm running on a Pentium Pro
200 machine with 96M of memory and the idl process is currently using about
20M. I don't understand why it is so slow. All it should be doing is
reading the values in the stats file and converting them to an ASCII
representation. The covariance matrices and eigenvalue matrices should
only be 224 x 224 and the histograms are 16K entries each (224 of them - I
know there are 16K entries each from an earlier run where it used a
quantization step size of 4) --- not that much data.
This is the second time I've run this and the first time the report
truncated all large values, displaying a sequence of **********'s instead.
This is of little use. Another option is to parse this file myslef, but I
don't know the file format, and can't seem to find that information.
Am I missing something? Is there a way to speed this up? Any suggestions?
Thanks!
-R
--
| Robert Estes | CIPIC - University of California, Davis |
| Qualimage, Inc. | Center for Image Processing and Integrated Computing |
| (530) 759-9016 | (530) 752-8224 |
| estes@qualimage.com | estes@ece.ucdavis.edu |
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