[Insight-users] Hints to create a known deformation image - Deformable Image registration?

[Luis Ibanez]

Hi Motes,

I thought that you were looking for an image to deform,
by applying to it the deformation field resulting from
a deformable registration process.

You are correct in that a grid image will be a poor input
for a deformable registration process.


      Regards,


           Luis


---------------------------------------------------
On Sun, Nov 1, 2009 at 6:27 PM, motes motes <mort.motes at gmail.com> wrote:
> Thanks both of you. But should the optimizer not have something to
> move in to find the peak of the cost function? I have previously used
> a white image with a single black box and the result was very poor
> when using eg. gradient based optimizer.
>
> I was thinking that the same problem would occur if I made a white
> image with a black grid.
>
>
>
>
> On Mon, Nov 2, 2009 at 12:17 AM, Nicholas Tustison <ntustison at gmail.com> wrote:
>> Hi Luis, Motes,
>>
>> Another possibility you might want to consider
>>
>> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1GridImageSource.html
>>
>> Nick
>>
>>
>> On Nov 1, 2009, at 6:06 PM, Luis Ibanez wrote:
>>
>>> Hi Motes,
>>>
>>> 1) Lena is certainly not the best motif for evaluating a deformable
>>>    registration process. You may want to use a grid image with
>>>    about four time the density of lines of the BSpline grid, and
>>>    lines that are more than 2 pixels apart.
>>>
>>>    The reason why you want lines to be more than 2 pixels apart
>>>    is to avoid aliasing when you resample the image using the
>>>    deformation field.
>>>
>>> 2) You could create such image by using GIMP
>>>
>>>      a) Open Gimp
>>>      b) create a new image,
>>>      c) Select Filters --> Render--> Pattern --> Grid
>>>      d) save the image
>>>
>>>
>>> 3)  Yes, you can make more detailed initial deformation...
>>>      but you have to initialize all the coefficients.
>>>
>>>      It may be desirable to generate those initial numbers
>>>       from a program...
>>>
>>>
>>>   Regards,
>>>
>>>
>>>         Luis
>>>
>>>
>>> --------------------------------------------------------------------
>>>
>>> On Fri, Oct 30, 2009 at 2:25 PM, motes motes <mort.motes at gmail.com> wrote:
>>>>
>>>> I would like to test my BSplineDeformable registration method with a
>>>> known deformation field. Currently I apply the BSplineWarping1.cxx
>>>> example to the fixed image and use the output as the moving image. As
>>>> input image I use lena:
>>>>
>>>> http://stochastix.files.wordpress.com/2008/07/lena-sjooblom.jpg
>>>>
>>>> But are there better motives that illustrate the deformation better
>>>> (like a chess board, salt/pebber image etc)?
>>>>
>>>> And is it possible to create a more detailed know deformation instead
>>>> of only changing the 8*8 deformation vectors in the text input file to
>>>> the warper?
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>>
>