| Re: Three questions [message #11392 is a reply to message #11389] |
Wed, 08 April 1998 00:00  |
David Foster
Messages: 341
Registered: January 1996
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Senior Member |
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biomedical wrote:
>
> Three questions:
>
> 1: what is 'sharp' function to images, or 'sharpening'?
> what is 'unsharp' ? how to do them in IDL?
These are just basic filtering techniques, to enhance either
low-frequency or high-frequency information in the image.
You can use convolution (CONVOL) with specialized kernels to
perform both.
> 2: how to read 1-bit Tiff (mono) file?
> 3: how to do the Matlab image processing, please take a look at:
> http://www.mathworks.com/demos/toolbox/image/ipss0011.html
> how to removes the minor regions, skeletonize, ...
Get a good book on image processing, and look into Convolution
(IDL's CONVOL) as a means to do filtering,
edge detection, feature removal, etc. The BW* Matlab routines
are very specialized functions, from the Image Processing toolbox
I would guess; I'm not sure IDL has anything like that. But do
look into LABEL_REGION, ROBERTS, SOBEL, SEARCH2D, ERODE, DILATE.
IDL can be used to do what the slide show does, but will require
some coding. When you get a better idea of what you need, ask
the newsgroup again, and be more specific. I'm sure someone has
coded some of these tasks.
Dave
>
> Thanks, please do NOT send me emails, just post here.
>
> Chester
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
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