| Re: 3D Reconstructions of 2D Slices [message #19816] |
Fri, 21 April 2000 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:
> Jeez, and *you* complain when people don't give enough
> information! :-)
I'm a terrible student. Molly Hardman, who I used to have
a lot of fun teaching IDL courses with, once threw me
out of one of her ENVI courses, saying I was hopeless.
And I thought I was just being funny. :-)
Cheers,
David
P.S. Let's just say I never did get my arms completely
around ENVI. :-(
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: 3D Reconstructions of 2D Slices [message #19818 is a reply to message #19816] |
Fri, 21 April 2000 00:00  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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davidf@dfanning.com (David Fanning) writes:
> Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:
>
>> Would this just-recently-declassified snippet help?
>>
>> vol = dblarr(100,100,20) ; 100x100 images, 20 of them
>> for i = 0, 19 do $
>> vol(*,*,i) = read_my_image(image_file(i))
>>
>> Extra bonus points can be gotten for recognizing the speed-up achieved
>> by saying "vol(0,0,i) = " instead.
>>
>> Somehow I think you are asking for more though?
>
> Would that it *were* this easy. Then all those Ph.D.
> candidates working on innovative techniques could purchase
> IDL and be hanging out at the corner bar instead of the
> lab.
>
> Unfortunately, the problem seems to be a *tad* more
> involved than this. But thanks to the 100 or so of you
> who think so little of my demonstrated IDL skills that
> you all sent me the same suggestion. :-)
Umm.... So what *are* the constraints? Are the slices evenly spaced?
Orthogonal directions? Arbitrary directions?
Jeez, and *you* complain when people don't give enough information!
:-)
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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| Re: 3D Reconstructions of 2D Slices [message #19819 is a reply to message #19816] |
Fri, 21 April 2000 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
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Senior Member |
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David Fanning, davidf@dfanning.com writes:
> But thanks to the 100 or so of you
> who think so little of my demonstrated
> IDL skills that you all sent me the same
> suggestion. :-)
There's a chinese proverb about the joy to be had in seeing an old
and dear friend fall from a high roof. Your word of Swedish to learn
today: "Skadegl�dje".
I have a book called The Image Processing Handbook by John C Russ
(CRC press, ISBN 0-8493-2516-1) which talks about some of the
techniques for doing this, but has no code and is almost wilfully
non-mathematical. Good references though, as far as I can tell. It
covers a lot of other material too, so it might be worth checking out
in a library before purchase.
I also know a couple of small companies which sell
inverse-tomography code, but I don't think that's what you want.
Struan
(I know, working on Good Friday. They'll be stoking up a
specially-hot area of Hades just for me).
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| Re: 3D Reconstructions of 2D Slices [message #19822 is a reply to message #19816] |
Thu, 20 April 2000 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:
> Would this just-recently-declassified snippet help?
>
> vol = dblarr(100,100,20) ; 100x100 images, 20 of them
> for i = 0, 19 do $
> vol(*,*,i) = read_my_image(image_file(i))
>
> Extra bonus points can be gotten for recognizing the speed-up achieved
> by saying "vol(0,0,i) = " instead.
>
> Somehow I think you are asking for more though?
Would that it *were* this easy. Then all those Ph.D.
candidates working on innovative techniques could purchase
IDL and be hanging out at the corner bar instead of the
lab.
Unfortunately, the problem seems to be a *tad* more
involved than this. But thanks to the 100 or so of you
who think so little of my demonstrated IDL skills that
you all sent me the same suggestion. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: 3D Reconstructions of 2D Slices [message #19823 is a reply to message #19822] |
Thu, 20 April 2000 00:00 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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davidf@dfanning.com (David Fanning) writes:
>
> Does anyone have any pointers/suggestions/code for creating
> 3D volume arrays from 2D image slices? I know this kind of
> thing is being done all the time, but apparently the IDL
> code for it is under lock and key at one (no one knows
> *which* one) of the National Labs. :-(
>
Would this just-recently-declassified snippet help?
vol = dblarr(100,100,20) ; 100x100 images, 20 of them
for i = 0, 19 do $
vol(*,*,i) = read_my_image(image_file(i))
Extra bonus points can be gotten for recognizing the speed-up achieved
by saying "vol(0,0,i) = " instead.
Somehow I think you are asking for more though?
Craig
--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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