[ITK-users] Texture pixel by pixel

[Francisco Lopez de la Franca]

Which directions (for 3D images) will your filter use if I donot specify
any offset?

2015-09-25 11:12 GMT+02:00 Francisco Lopez de la Franca <
franciscolopezdelafranca at gmail.com>:

> 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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>>
>>
>
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