[Insight-users] Does ConfidenceConnectedImageFilter remove pixels?

[Miklos Espak]

Yes, that is what happened. I lowered the mean. What I did not know is that
in every iteration after computing the new mean and standard deviation, the
output buffered is filled with zeros. So, every iteration starts with a
completely blank image, not with the output of the previous iteration. This
may make sense, however, it was misleading for me, I think it should be
noted in the documentation.

Thanks,
Miklos


On Wed, May 4, 2011 at 9:42 AM, Sergio Vera <sergio.vera at alma3d.com> wrote:

> In a recent thread that I cannot find right now, someone said that Connf
> connected can discard already segmented pixels as iterations increase,
> giving certain conditions (ie: a big number of homogeneous pixels are
> segmented, lowering the mean and hence excluding pixels that were segmented
> before, if I remember correctly)
>
> On Tue, May 3, 2011 at 7:00 PM, Miklos Espak <espakm at gmail.com> wrote:
>
>> The problem happens when the multiplier is below 1.0. Is it a misuse to
>> specify such a multiplier?
>>
>> I attached a sample code, and I will send the sample image in private.
>> (0.5MB)
>>
>> Thanks,
>> Miklos
>>
>> On Tue, May 3, 2011 at 3:05 PM, Karthik Krishnan <
>> karthik.krishnan at kitware.com> wrote:
>>
>>> It should not. Are you adding as seeds an entire mask of pixels ? Can
>>> you post a minimal working example demonstrating this
>>>
>>> thx
>>>
>>>
>>> On 5/3/11, Miklos Espak <espakm at gmail.com> wrote:
>>> > Hi,
>>> >
>>> > can the ConfidenceConnectedImageFilter remove pixels from the detected
>>> > region?
>>> >
>>> > I found that if I increase the number of iterations (from 3 to 30), the
>>> > created mask will contain fewer pixels.
>>> >
>>> > The documentation says that "letting the algorithm run for more
>>> iterations
>>> > the region will end up engulfing the entire image", but I have not found
>>> > anything about that the region may shrink.
>>> >
>>> > How is that possible?
>>> >
>>> > Regards,
>>> > Miklos
>>> >
>>>
>>
>>
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>
>
> --
> Sergio Vera
>
>  Alma IT Systems
>  C/ Vilana, 4B, 4º 1ª
>  08022 Barcelona
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