[Insight-users] Thanks, Another Question

[Luis Ibanez]

Hi Rahil

1) Before you start measuring computation time,
    please make sure that you configured ITK to
    build for "Release". This is done by running
    CMake and setting the variable

                   CMAKE_BUILD_TYPE

2)  Regarding the time for building the pyramid,
     170 seconds looks a bit too long...

     How many resolution levels are you using ?
     What is the subsampling schedule ?



  Please let us know,


       Thanks


             Luis

-------------------------------------------
On Sun, Jun 20, 2010 at 8:28 AM, raheleh m <meshgolok at yahoo.com> wrote:

> Dear Mr. Ibanez
>
> Thanks a lot for your attention and help. Actually, I have another question
> and I would be really grateful
> if you could please help me with this one too. I am using Multi Resolution
> Registration method of itk, and my data size is 512*512*200. The prepare
> pyramids function takes about 170 seconds, but the optimization loop is
> fast, about 12 seconds. The total registration time is about 202 seconds. Is
> this normal, or I miss something? How can I reduce the time of prepare
> pyramids? I know it is a lot to ask and I appreciate it a lot.
>
> Thanks in advance,
> Sincerely Yours
>
> Rahil Meshgolok
>
> ------------------------------
> *From:* Luis Ibanez <luis.ibanez at kitware.com>
> *To:* raheleh m <meshgolok at yahoo.com>
> *Cc:* itk <Insight-users at itk.org>
> *Sent:* Thu, June 17, 2010 8:40:41 PM
> *Subject:* Re: Permute Order in MultiResMIRegistration
>
>
> Hi Rahil,
>
>
> Please read the documentation of the class at:
>
> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1FlipImageFilter.html
>
>       "The image is flipped across axes for which array[i] is true."
>
>
> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1PermuteAxesImageFilter.html
>
>      "The elements of the array must be a rearrangement
>       of the numbers from 0 to ImageDimension - 1.
>
>      "The i-th axis of the output image corresponds with
>        the order[i]-th axis of the input image."
>
> If you pass [0 1 2] as parameter, then the output image will be identical
> to the input image.  If you pass [1 0 2] then the output image will use as
> X axis, what used to be the Y axis of the input image, and will use as
> Y axis, what used to be the X axis of the input image.
>
>
> Note that in general, you should NOT use the flip / permute
> filters. Particularly not if you are using medical data.
>
>
>      Regards,
>
>
>           Luis
>
>
> -------------------------------------------------------------------------
> On Mon, Jun 14, 2010 at 8:12 AM, raheleh m <meshgolok at yahoo.com> wrote:
>
>> *Greetings!
>> *
>> I am using ITK Registration. I would be really grateful if you could
>> please let me know the meaning of permute order and flip axes arrays. I mean
>> when permute order is [0 1 2] what is the order of axes? what about [2 0 1]?
>> Does the first array mean (x,y,z) and the second (z,x,y)? I have the same
>> question about flip axes.
>>
>> Thanks in advance
>> Rahil Meshgolok
>>
>>
>
>
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