[ITK-users] Creating a region to store LabelObjects

[Gaetan Lehmann]

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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