[ITK] [ITK-dev] New Image Filter for Submission

[Bradley Lowekamp]

David,

This filter was integrated in to ITK [1].

It handles the case where the image size is not a factor of the shrinkFactor, by truncating, and changing the image's physical extent. The doxygen page illustrates how this occurs.

Are you using the ITKv4 registration framework? I am curious how you are integrating this multi-scale feature into the framework.

[1] http://www.itk.org/Doxygen/html/classitk_1_1BinShrinkImageFilter.html

On Oct 15, 2015, at 3:35 PM, David Burns <david.mo.burns at gmail.com> wrote:

> Thanks Matt -
> 
> You are correct. Very similar. I will not post mine in that case.
> 
> Best
> David
> 
> On 10/15/2015 03:17 PM, Matt McCormick wrote:
>> Hi David,
>> 
>> Thanks for contributing to ITK.
>> 
>> It sounds like this filter does the same as the BinShrinkImageFilter?:
>> 
>>   http://www.insight-journal.org/browse/publication/912
>> 
>> Matt
>> 
>> On Thu, Oct 15, 2015 at 2:48 PM, David Burns <david.mo.burns at gmail.com> wrote:
>>> Dear Insight Developers,
>>> 
>>> I have developed an image filter that may be useful to the community. Please
>>> let me know if you think this is the case, and I will submit it to the
>>> Journal.
>>> 
>>> The filter produces a subsampled version of the input image, where the
>>> output image has the same output dimensions (Size[i]*Spacing[i]) but with
>>> the number of pixels (Size[i]) scaled down by a factor (factor[i]) across
>>> the dimensions. The pixels of the output image are an average over the input
>>> pixels they overlap. The filter verifies/ensures that factor[i] is an exact
>>> factor of the input image Size[i], so that the image properties remain
>>> unchanged by the filter.
>>> 
>>> I found this to be useful for my registration task to produce a lower
>>> resolution image very quickly, without needing to use itk::
>>> ResampleImageFilter, interpolation or smoothing.
>>> 
>>> I've attached a screenshot of an xray, subsampled / averaged by a factor of
>>> 4 in x and y. Let me know your thoughts?
>>> 
>>> Thanks
>>> David Burns
>>> 
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> 
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