[Insight-users] Extracting each connected component of a binary image

[Pol Monsó]

Thanks everyone for your suggestive solutions. I'll probably start with
option Bill suggested, however, Brad, where's the
*itkBoundingBoxImageLabelMapFilter
*? I couldn't find it on the repository* *you linked to.*
*


2013/9/14 Bradley Lowekamp <blowekamp at mail.nih.gov>

> Hello,
>
> I have an ITK extension which does what Richard suggests:
>
> https://github.com/blowekamp/itkOBBLabelMap
>
> I believe this test does what you want:
>
>
> https://github.com/blowekamp/itkOBBLabelMap/blob/master/test/itkBoundingBoxImageLabelMapFilterTest.cxx
>
> Also in the module is the computation of Oriented Bounding Boxes based on
> the orientation of the second movements. And similarly there is a way to
> extract the resampled images. However, there is an issue with the lack of
> thread safely with the interpolator, so a line needs to currently be
> commented out of OBB image.
>
> I'd recommend writing a test to validate the results are as expected
> before using it.
>
> Let me know if it works for you.
>
> Brad
>
> On Sep 14, 2013, at 1:32 AM, Richard Beare <richard.beare at gmail.com>
> wrote:
>
> The label map tools make it easy to construct this kind of facility, with
> bounding box computation and other useful options. There is also
> AutoCropLabelMapFilter which may be a useful starting point.
>
>
> On Sat, Sep 14, 2013 at 6:41 AM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
>
>> As far as I know, there is not an ITK filter that will extract N
>> images from a label image. You could use itkThresholdImageFilter to
>> extract each label.
>>
>> On Fri, Sep 13, 2013 at 4:33 PM, Pol Monsó <pol.monso+tools at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > I've searching how to extract each connected component of a binary image
>> > such as
>> > http://blogs.mathworks.com/images/steve/2008/binary_indexed_vis_01.png
>> > into a separate image through the ConnectedComponentFilter (or maybe the
>> > labelmap?)
>> >
>> > I've seen how to extract the largest one on the examples, but I
>> couldn't see
>> > how to iterate over the image to extract each one of them into a
>> separate
>> > image. I could iterate over the image checking pixelvalues, but that
>> does
>> > not seem efficient and I suspect there's another way to do this.
>> >
>> > It looks that the ChangeLabelImageFilter should be able to do it but I
>> > couldn't figure out how. A short example would be perfect, or a pointer
>> to
>> > how to iterate over the connected components.
>> >
>> > Cheers,
>> >
>> > Pol
>> >
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>>
>> --
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