[ITK] [ITK-users] Creating a region to store LabelObjects

Gaetan Lehmann gaetan.lehmann at gmail.com
Tue Apr 21 14:44:43 EDT 2015


Hi,

The attributes are only updated by the filters, not by the label objects,
so you should recompute the attributes after having after moving them.

Gaëtan
Le 21 avr. 2015 19:05, "Pol Monsó Purtí" <lluna.nova at gmail.com> a écrit :

> After tweaking here and there, I believe the problem was mine that I was
> shifting the objects twice because it doesn't happen anymore.
>
> The Shift problem remains, thought. Shifting doesn't update the
> labelobject attributes, so, right now, I shift the pixels _and_ then shift
> (get,offset,set) the boundingbox, given that those are the attributes that
> I need.
>
> Cheers,
>
> Pol
>
> 2015-04-21 12:29 GMT+02:00 Pol Monsó Purtí <lluna.nova at gmail.com>:
>
>> Hello all,
>>
>> related to a couple of conversations we've had here I've noticed a
>> strange behaviour that is related to the LabelMap representation.
>>
>> I have two label objects
>>
>> bounding box1 ImageRegion (0x7fd381317888)
>>
>> Dimension: 3
>>
>> Index: [23, 40, 2]
>>
>> Size: [60, 71, 9]
>>
>>
>> bounding box2 ImageRegion (0x7fd38131a328)
>>
>> Dimension: 3
>>
>> Index: [74, 18, 2]
>>
>> Size: [24, 39, 9]
>>
>>
>> If I create a region of size [100, 120, 11] it should be able to store
>> those two objects.
>>
>> However, (maybe) that is not the case because the objects are not drawn
>> at slice 2 but on slice 5 when I write the output of
>> LabelMapToLabelImageFilter. There is no exception thrown, thought.
>>
>> I've also noticed that using the Shift function of the LabelObject
>> doesn't change the object's boundingBox, which leds me to think that each
>> pixel has a shift somehow not related to the bounding box.
>>
>> I can provide a Minimum Working Example if needed.
>>
>> I've read the article journal, but I couldn't see the answer, may be
>> related to 'storing the label objects as lines', which I don't completely
>> understand what's the graphical representation of those lines.
>>
>> What is going on?
>>
>> Cheers,
>>
>> Pol
>>
>
>
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