| 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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