At first though maybe you can let the region grow past the plane, and later, cut the growed region multiplying it with a mask image of the valid area if you can obtain such a mask easily.<div><br></div><div>Regards.<br><br>
<div class="gmail_quote">On Mon, Aug 2, 2010 at 9:21 PM, Chris Turner <span dir="ltr"><<a href="mailto:cturnercomplex@googlemail.com">cturnercomplex@googlemail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
I have an image and want to segment it into different parts. Region<br>
growing should absolutely do the trick. But my only problem is that I<br>
also have some borders which the algorithm shouldn't cross. The<br>
Borders are specified as a plane. First I have to convert the plane<br>
coordinates into image coordinates. Is there an easy way to do so or<br>
do I have to do it by "hand" (....by myself)<br>
<br>
About the segmentation: My first thoughts are basically write my own<br>
region growing algorithm and add besides the intensity evaluation (if<br>
minThreshold<pixel_intensity<maxThreshold) a second evaluation which<br>
checks if the pixel is in the specific border/region.<br>
<br>
<br>
What do you think about this, do you have any better ideas? And also<br>
where should I start? I thought maybe just use the<br>
itkConnectedThresholdImageFilter (3.20) and change the iteration loop<br>
to something like this:<br>
<br>
[begins line 296]:<br>
<br>
typedef FloodFilledImageFunctionConditionalIterator<OutputImageType,<br>
FunctionType> IteratorType;<br>
IteratorType it ( outputImage, function, m_SeedList );<br>
it.GoToBegin();<br>
<br>
while( !it.IsAtEnd())<br>
{<br>
if(pixelPosition > border)<br>
continue;<br>
it.Set(m_ReplaceValue);<br>
++it;<br>
progress.CompletedPixel(); // potential exception thrown here<br>
}<br>
<br>
But I don't have the pixel position at this point - right?<br>
<br>
<br>
So how would an ITK export approach this problem?<br>
<br>
Thanks<br>
Chris<br>
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