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From: "Vikram " <vikramthevictor@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: image processing
Date: Sun, 30 Mar 2008 11:58:01 +0000 (UTC)
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"misty m." <donotspam@smth.be> wrote in message
<fsns6q$ke7$1@fred.mathworks.com>...
> hi,
> i've got a problem with an image. You can take a look at 
> the image here: http://test-bone.pl.tl/
> 
> it is an image of a bone with few drilled holes (You can 
> see 3 drilled holes on the left side of a bone). i must 
> find edges of these holes (actually the middle one) using 
> matlab function 'edge' but because of these cracks i cannot.
> can You please suggest me some operation i can do on this 
> image to get rid of these crakcs so i can find edges of 
> these holes?
> 
> kind regards
>  
I can see you are into medical imaging, you present an
interesting conundrum, maybe you can convert the image to a
negative image, there by making all dark pixels white and
white pixels dark, if you do that, you will see that the
'hole' in your image is very prominent, then you may proceed
to detect the edges - which I have no clue about.
the formula for that is , negativepix = 255 -
TrueIntensityOfAPixel(process these elements using a formula).