[ITK-users] Texture pixel by pixel

[Francisco Lopez de la Franca]

Hi again,

For 3D images, what should I use as default offset vector if I use your
class?

I've been using itk::ScalarImageToTextureFeaturesFilter for 3D images and
I've also done some tests on 3D NIFTI images but its description talks only
about the default 2D image offsets ({(-1, 0), (-1, -1), (0, -1), (1, -1)})
but not for 3D. Besides, the 2D default is missing some offsets.

I'd like to use your class and test it with the same default values as with
the ScalarIm.... class.

Thank you very much.
My best regards.


2015-09-22 14:27 GMT+02:00 Bradley Lowekamp <blowekamp at mail.nih.gov>:

> Hello,
>
> Please try to keep this discussion on the mailing list.
>
> You can find a basic program here [1].  Which provide a good example for
> usage.
>
>  It allows writing to any file format that ITK supports with vector
> images. I know that mha, nii, and nrrd should support this. Others may and
> it varies based what modules are compiled into ITK.
>
> You can see how the texture information is written into the vector here
> [2]. Contributions to improve the documentation are welcomed.
>
>
>
> [1]
> https://github.com/blowekamp/itkTextureAnalysis/blob/master/test/itkTextureFeatureImageFilterTest.cxx
> [2]
> https://github.com/blowekamp/itkTextureAnalysis/blob/b3911a8ab891859c50c7e3c8819d1a9fa0eaf4af/include/itkTextureFeatureImageFilter.hxx#L217-L224
>
> On Sep 22, 2015, at 3:25 AM, Francisco Lopez de la Franca <
> franciscolopezdelafranca at gmail.com> wrote:
>
> Hi Bradley,
> I'd like to use your class. A couple of questions:
>
> - Which format can the vectorimage generated be saved in? Is it possible
> to save it in Nifti format?
>
> - Which information does the vector image contain, I mean, what is the
> info stored for each voxel? How can I access that info?
>
> I guess the usage of yourclass is in the same way as any ITK filter:
>
> yourFilter->setInput(inputImage);
> yourFilter->setWindowSize(windowSize);
> ... // other sets...
> yourFilter->update();
> vectorImage = yourFilter->GetOutput();
>
> but, how can I read the data of each voxel in the vector image?
>
> Thank you very much.
> Kind regards.
>
>
> 2015-09-21 14:30 GMT+02:00 Bradley Lowekamp <blowekamp at mail.nih.gov>:
>
>> Hello,
>>
>> I have a external ITK extension you may find useful:
>>
>> https://github.com/blowekamp/itkTextureAnalysis/blob/master/include/itkTextureFeatureImageFilter.h
>>
>> This computed the GLCM, for a neighborhood for every pixel and produces a
>> VectorImage with all the features.
>>
>> Contributions to improving the class and documentation are welcome.
>>
>> HTH,
>> Brad
>>
>> On Sep 21, 2015, at 7:15 AM, Francisco Lopez de la Franca <
>> franciscolopezdelafranca at gmail.com> wrote:
>>
>> > Hi,
>> > I've used the itk::Statistics::ScalarImageToTextureFeaturesFilter class
>> with the default parameters and everything was OK.
>> >
>> > But now, I have to calculate the texture features of a 2D scalar image
>> pixel by pixel, I mean, iterate over the whole image and calculate the
>> texture features of every pixel.
>> >
>> > I guess I've got to use each pixel as the masked region over which to
>> calculate the texture features, but I think this process could be very slow
>> (I have to do it with a lot of 2D images).
>> >
>> > Is there a faster way to do it or isn't it possible as I've described?
>> >
>> > Thanks a lot.
>> > Kind regards.
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