| Re: how i can detect round bright structures in picture?? [message #30735] |
Wed, 15 May 2002 14:38  |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Careful, now :-E
I have *never* asked a question about images. Simply because image
processing is so easy in IDL that it is pretty much self-explanatory.
You just keep trying until, a) you are sick and tired and don't care
anymore, or, b) you get a result that is satisfactory to you in your
current sick and tired condition :-)
Lesson: you will get frustrated no matter what you try to do with
images. Except if, like myself, you never work with them :-)
Cheers,
Pavel
David Fanning wrote:
>
> This sort of reminds me of Pavel, when he first started
> posting to the newsgroup. :-)
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| Re: how i can detect round bright structures in picture?? [message #30746 is a reply to message #30735] |
Wed, 15 May 2002 12:02  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Ulf (Ulfer@gmx.de) writes:
> White noise with the image files concerned (naht1.bmp... naht20.bmp)
> acts it thereby around a picture pile of 20 pictures (raw data 615 x
> 416), which comes from a picture recording system, whatever conveys
> apart from the actual picture signal disturbances. Therefore to the
> actual signal white noise (thus with average value 0) as disturbance
> with the picture is returned the delivery. Radiographs of a welding
> seam are shown with those errors in the material structure as bright
> points on dark background to be illustrated. Use now your knowledge
> for picture improvement in such a way that material defects in the
> welding seam (round bright structures in the dark display space) in
> the picture become recognizable. Indicate they the number of
> recognized material defects.
>
>
> what can i use ?? hmmmm i have no real idear..... i tryed median but
> bothing find should i tryed gauss?? so when how ? thx for answer
This sort of reminds me of Pavel, when he first started
posting to the newsgroup. :-)
Humm. Let's see.
Have you tried smoothing, or maybe unsharp masking?
IDL> TV, image - Smooth(image, 5)
Histogram equalization?
IDL> TV, Hist_Equal(image)
Some kind of thresholding:
IDL> XStretch, image
XStretch is one of my programs:
http://www.dfanning.com/programs/xstretch.pro
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@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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| resizing idlde editor windows? (was: Re: how i can detect round bright structures in picture??) [message #30817 is a reply to message #30746] |
Thu, 16 May 2002 07:49 |
Jaco van Gorkom
Messages: 97
Registered: November 2000
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Member |
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"David Fanning" <david@dfanning.com> wrote in message news:MPG.174c5ec8f827f2129898d6@news.frii.com...
> ...
> This sort of reminds me of Pavel, when he first started
> posting to the newsgroup. :-)
That got me curious all right. I googled upon this very first message,
dated April 13, 1999:
Hello IDL pros,
Do you know how to make editor window size, when in "multiple windows"
mode on a Unix machine, to stay the same, smaller or bigger than
default? Any time I resize a window and double-click on something in
it, it pops back to the default size. Why?
Thank you,
Pavel
Did you ever get an answer to this, Pavel? If not, then I would like
to repost and slightly rephrase the question: Very often when I resize
a window and click on something in it, it pops back to the default size.
Why?
Using Exceed on a Win2000 PC, idlde 5.4 running on Solaris.
cheers,
Jaco
P.S.: The reminiscense to 'round bright structures in picture' eludes
me at the moment, David...
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