[Insight-users] Re: Resizing an Image

[Luis Ibanez]

Hi Balaji,

Yes, the ResampleImageFilter should work for TIF images.

ITK filters are independent of the file format that you use
for storing your images.  Once the image is loaded into
memory by a reader, you can apply any ITK filter on it.

The only restrictions are related to the pixel type and
the nature of the processing.

What pixel type are you using ?

How many bits per pixels do your TIF images have ?


    Please let us know,


       Thanks



        Luis


=======================
Balaji Gandhi wrote:
> Hi Luis,
> 
> Does the "Resample Image Filter" work for TIF files? It worked fine for 
> PNG but for TIF it outputs a blank image.
> 
> Please let me know.
> 
> Thanks,
> Balaji
> 
> On 4/28/06, *Luis Ibanez* <luis.ibanez at kitware.com 
> <mailto:luis.ibanez at kitware.com>> wrote:
> 
> 
>     Hi Balaji,
> 
>     Resizing an image is equivalent to resampling. We prefer the term
>     "resampling" because it makes clearer the distinction between working
>     in the pixel space of the image or in the physical space of the
>     objects that are captured in the image.
> 
> 
>     You will find detailed instructions on how to resample images in
>     the ITK Software Guide:
> 
>              http://www.itk.org/ItkSoftwareGuide.pdf
>     <http://www.itk.org/ItkSoftwareGuide.pdf>
> 
>     In section 6.9.4, "Resample Image Filter", pdf page 254-285.
> 
> 
>     In your case you will need simply an IdentityTransform, and a change
>     on the Spacing of the image grid and the size of the Grid. Note that
>     you *DON'T* need scaling transform, because your object in physical
>     space are still the same, regardless of the resolution of the pixels
>     that you use for your image. When you "resize" an image you are only
>     changing the sampling grid.
> 
> 
>     If you are just subsampling your image, you may find
>     useful to the itkShrinkImageFilter,
> 
>     http://www.itk.org/Insight/Doxygen/html/classitk_1_1ShrinkImageFilter.html
> 
>     as an alternative option to the ResampleImageFilter.
> 
>     http://www.itk.org/Insight/Doxygen/html/classitk_1_1ResampleImageFilter.html
> 
> 
>        Regards,
> 
> 
> 
>           Luis
> 
> 
> 
>     ------------------------
>     Balaji Gandhi wrote:
>      > Hi Luis,
>      >
>      > Pardon me if this is a very basic question. I would like to know the
>      > steps to resize a TIFF image. Please let me know if possible.
>      >
>      > Thanks,
>      > BG
>      >
>      > --
>      > =========================
>      > Balaji Gandhi
>      > Research Associate
>      > Biomolecular Science Center
>      > University of Central Florida
>      > 4000 Central Florida Blvd.
>      > BMS building, Room 223
>      > Orlando, FL  32816-2364
>      > Phone: 407-823-3387
>      > Fax: 407-823-0956
>      > URL: imgem.ucf.edu <http://imgem.ucf.edu> <http://imgem.ucf.edu>
>      > =========================
> 
> 
> 
> 
> 
> -- 
> =========================
> Balaji Gandhi
> Research Associate
> Biomolecular Science Center
> University of Central Florida
> 4000 Central Florida Blvd.
> BMS building, Room 223
> Orlando, FL  32816-2364
> Phone: 407-823-3387
> Fax: 407-823-0956
> URL: imgem.ucf.edu <http://imgem.ucf.edu>
> =========================