Fw: [Insight-users] Converting Image Data to Vector type

[Jisung Kim]

Hello.

I don't think the PNG IO supports reading vector pixel
type images. But, for the first problem, casting
scalar  image to vector image can be done using the
itkScalarToArrayCastImageFilter. You can cast any
built-in scalar type (int ,long, float, ...) to
itk::FixedArray or its subclasses (e.g. itk::Point,
itk::Vector, ...).

Thank you,

Jisung Kim.
 
--- Samuel_Rodr�guez_Bescos
<srodrigu@gbt.tfo.upm.es> wrote:
> Thanks Luis for your help.
> 
>  Your second reply solves my problem. But My first
> question in not the same
> that you think. I have a grey scale images and I
> want to use the gibbs
> segmentation filter. This filter need  a mask of the
> estimation of my object
> and I want to use the gaussian classifier. I noticed
> that this filter need
> the input in vector format. furthermore I want to
> read my image in .PNG
> format and I think that It not  posible to read a
> gray-scale image in .PNG
> format with pixels like  vectors of one dimension.
> Maybe I can't explain you
> enough clearly, I'm sorry for that but my English is
> not so good.
> 
> Thank for your help. It very useful for me,
> 
> Samuel
> 
> ----- Original Message -----
> From: "Luis Ibanez" <luis.ibanez@kitware.com>
> To: <srodrigu@gbt.tfo.upm.es>
> Cc: <insight-users@public.kitware.com>
> Sent: Friday, August 02, 2002 8:53 PM
> Subject: Re: Fw: [Insight-users] Converting Image
> Data to Vector type
> 
> 
> >
> > Hi Samuel,
> >
> >
> >  From your first answer I understand that you have
> a set
> > of N .png files each one containing a gray-scale
> image
> > and you want to load them into a itkImage with a
> > ND vector as pixeltype. Is that right ?
> >
> > Here are two options:
> >
> > 1) use Image Adaptors.
> >
> > 2) use a two stage process : load the N image
> >     and then copy their content to a Vector image.
> >
> > Option (1) will probably work better with the
> pipeline
> > update mechanism.
> >
> > Please take a look at the class
> >
>
http://www.itk.org/Insight/Doxygen/html/classitk_1_1NthElementImageAdaptor.h
> tml
> >
> > It can be found at:
> >
> > Insight/Code/Common/itkNthElementImageAdaptor.h
> >
> > An example of the use of adaptors can be seen at:
> >
> >   
>
Insight/Testing/Code/BasicFilters/itkImageAdaptorNthElementTest.cxx
> >
> > --------
> >
> > About the second answer:
> >
> > If you already have a labeled image and just want
> to reduce this
> > one to a 1,0 images, the
> BinaryThresholdImageFilter:
> >
>
http://www.itk.org/Insight/Doxygen/html/classitk_1_1BinaryThresholdImageFilt
> er.html
> >
> > (as you pointed out) should solve the problem.
> >
> > This filter expect you to define lower and upper
> values
> > for a gray-level range. Then the image is filtered
> and all
> > the pixels with values outside this range will be
> mapped to
> > an "OutsideValue" (provided by the user) while the
> pixels
> > with values inside the range will be mapped to an
> "InsideValue".
> >
> > Something like the following code should do it:
> >
> >    binaryFitler.SetInput(
> myLabelFilter.GetOutput() );
> >    binaryFilter.SetOutsideValue( 0 );
> >    binaryFilter.SetInsideValue( 1 );
> >    binaryFilter.SetUpperThreshold(myLabel+1);
> >    binaryFilter.SetLowerThreshold(myLabel-1);
> >
> >    binaryFitler.Update();
> >
> >
> > assuming that myLabelFilter is the one that label
> your image
> > and the "myLabel" value is the one you are
> interested on.
> >
> >
> > Please let us know if that helps.
> >
> > Thanks,
> >
> >    Luis
> >
> >
> >
>
=====================================================
> > >>Hello Luis,
> > >>
> > >>The anwers for your questions,
> > >>
> > >>1) I want to read a .png image file into a
> vector image.The problem is
> > >>
> > > that
> > >
> > >>I'm using the Gibbs filter with a Gaussian
> estimator and the last one
> > >>
> > > needs
> > >
> > >>to have the input as vector image. I'm using
> grey-scales images.
> > >>
> > >>2) For the second question: I'm using the
> watershed class to segment an
> > >>image of a slice of the human abdomen (the liver
> zone of the human
> body).
> > >>The output is an image with labeled  pixels. I
> want to create a new
> image
> > >>selecting the pixels that have the same label
> and the get one object.I
> > >>
> > > think
> > >
> > >>I can do that with BinaryThresholdImageFunction
> class. Is it possible?
> > >>
> > >>Thanks for your reply,
> > >>
> > >>Samuel
> > >>
> >
> 
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>
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=====
Jisung Kim
bahrahm@yahoo.com
106 Mason Farm Rd.
129 Radiology Research Lab., CB# 7515
Univ. of North Carolina at Chapel Hill
Chapel Hill, NC 27599-7515

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