[Insight-users] Minimum/Maximum Image Filters

[Luis Ibanez]

Gaetan,

Thanks for the clarification.

An example has now been added for the
ValuedRegionalMaximaImageFilter:

http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ValuedRegionalMaximaImageFilter



       Luis


------------------------------------------------
On Fri, Dec 10, 2010 at 7:49 AM, Gaëtan Lehmann
<gaetan.lehmann at jouy.inra.fr> wrote:
>
> Le 10 déc. 10 à 12:59, Luis Ibanez a écrit :
>
>> Hi David,
>>
>> Thanks for posting the example.
>>
>> I just modified the CreateImage() method
>> to better illustrate what this filter does.
>>
>>
>> http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/RegionalMaximaImageFilter
>>
>> It essentially find the local maxima in the
>> input image and mark them in the output
>> image.  So, the output image is a binary
>> image that is zero everywhere, except at
>> the pixels that are local intensity maxima
>> in the input image.
>>
>> This is the filter that you may want to
>> run on the output of an FFT crosscorrelation
>> if you were looking for a face in a group
>> photograph, or the if you were analyzing
>> the parameter space of an Hough transform.
>>
>>
>> I'm not sure that this is what Robert was
>> asking for...   from his email, it looks like
>> he wanted the output pixel to have the
>> value of the input pixel.   On the bright side
>> that probably can be done with a minor
>> retouch of the filter source code.
>
> Hi,
>
> This is exactly what itk::ValuedRegionalMaximaImageFilter is doing.
> IIRC, itk::RegionalMaximaImageFilter use the output of
> itk::ValuedRegionalMaximaImageFilter to produce its output image.
>
> Regards,
>
> Gaëtan
>
>
>>
>> but, maybe now that the example is clearer,
>> it would be easier for Robert to give it a try
>> and let us know.
>>
>>
>>    Luis
>>
>>
>> -----------------------------------------------
>> On Thu, Dec 9, 2010 at 11:25 AM, David Doria <daviddoria at gmail.com> wrote:
>>>
>>> On Thu, Dec 9, 2010 at 11:16 AM, Ryan Smith <ryanleesmith at gmail.com>
>>> wrote:
>>>>
>>>> Hi Robert-
>>>>
>>>> You might take a look at the itk::RegionalMaximaFilter.
>>>>
>>>> Here is a previous response that helped me with a similar task:
>>>>
>>>>
>>>> http://public.kitware.com/pipermail/insight-users/2010-September/038088.html
>>>>
>>>> Cheers-
>>>> -Ryan
>>>
>>> (small typo:  itk::RegionalMaximaFilter ->
>>>  itk::RegionalMaximaImageFilter)
>>>
>>> I put a shell example here:
>>>
>>> http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/RegionalMaximaImageFilter
>>>
>>> I'm not exactly sure what this filter is supposed to do. If someone
>>> can modify the CreateImage function so that the resulting filtered
>>> image demonstrates the point that would be great.
>>>
>>> David
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> --
> Gaëtan Lehmann
> Biologie du Développement et de la Reproduction
> INRA de Jouy-en-Josas (France)
> tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
> http://voxel.jouy.inra.fr  http://www.itk.org
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>