[Insight-developers] Adding ValueType to itk::Image

Thu, 21 Feb 2002 22:46:51 -0500

I think a pointset has points as its value type - that's what the name
pointset implies to me....

Stephen

Jisung Kim wrote:
> 
> Hi Jim.
> 
> I think you are right. The original idea was using
> only the Point (position in feature space, not in
> normal space(?)). I believe Luis used PointSet to
> represent parameters in parametric space in his
> Curves2DExtractor example, and the original idea was
> extension of his idea. However, as you pointed out,
> since PointSet has distinction between Point and
> PointData, and has two containers for them, simply
> ignoring PointData would not be a good call.
> 
> I have to think about a way to allow users to choose
> Point, PointData, or union of both as measurement
> vector type.
> 
> And the question of ValueType is really ambiguous
> here.
> 
> Without any objection, I will add ValueType to Image
> tomorrow, but not PointSet. If anyone has an good
> idea, please let me know.
> 
> Thank you,
> 
> Jisung.
> 
> 
> --- "Miller, James V (CRD)" <millerjv@crd.ge.com>
> wrote:
> > I would say the ValueType for a PointSet is the
> > PixelType NOT the PointType.
> >
> > But I think it really comes down to what you want to
> > consider your
> > independent variables and what are your dependendent
> > variables.
> >
> > If the positions are which data is collected is
> > prescribed, then the
> > position is an independent variable and the pixel
> > value is a dependent
> > variable.
> >
> > If the positions are themselves random events, then
> > both the position
> > and pixel values are dependent random variables.
> >
> > So the short answer :) is that sometimes just the
> > PixelType is the ValueType
> > and other times the union of the PixelType and
> > PointType are the ValueType.
> >
> >
> >
> >
> > -----Original Message-----
> > From: Jisung Kim [mailto:bahrahm@yahoo.com]
> > Sent: Thursday, February 21, 2002 3:36 PM
> > To: Luis Ibanez; Miller, James V (CRD)
> > Cc: 'Jisung Kim'; insight-dev-list
> > Subject: Re: [Insight-developers] Adding ValueType
> > to itk::Image
> >
> >
> > Hi.
> >
> > It seems like adding ValueType to image is okay with
> > folks.
> >
> > However,I think there are two data element types in
> > PoinSet, PointType and PixelType (PointData)
> > referred
> > by common identifier (PointIdentifier). The former
> > is
> > stored in the PointContainer and the latter in
> > PointDataContainer.
> >
> > Up to now, in term of statistics, I ignored the
> > PointData and considered the points in a PointSet
> > exist in feature space. In this case, the ValueType
> > should be PointType. I don't know the answer about
> > which data is primary in PointSet.
> >
> > Thanks,
> >
> > Jisung.
> >
> > --- Luis Ibanez <luis.ibanez@kitware.com> wrote:
> > >
> > > I could be convenient to add this type to
> > > itk::PointSet  too,
> > > again as    ValueType = PixelType.
> > >
> > > So it can be used when PointSet are connected via
> > > the
> > > adaptors the the Statistical classes.
> > >
> > >
> > >   Luis
> > >
> > > --------------------------------------------
> > >
> > > Miller, James V (CRD) wrote:
> > >
> > > >Adding ValueType to be same as PixelType is fine
> > in
> > > Image.
> > > >
> > > >
> > > >-----Original Message-----
> > > >From: Jisung Kim [mailto:bahrahm@yahoo.com]
> > > >Sent: Thursday, February 21, 2002 2:40 PM
> > > >To: insight-dev-list
> > > >Subject: [Insight-developers] Adding ValueType to
> > > itk::Image
> > > >
> > > >
> > > >Hi.
> > > >
> > > >While I was working with Sayan to create common
> > > base
> > > >class for SampleClassifier and ImageClassifier.
> > We
> > > >encountered a problem with a typedef. Currently,
> > > any
> > > >Sample classes has MeasurementVectorType for its
> > > >element type and Image class has PixelType for
> > the
> > > >same purpose. The ClassifierBase class needs a
> > > typedef
> > > >for MembershipFunction and MembershipFunction is
> > > >templated over MeasurementVector. By adding
> > > ValueType
> > > >(alias of MeasurementVectorTyp in Sample, and
> > > >PixelType in Image), we can remove all template
> > > >arguments except the data container class type
> > > (Sample
> > > >or Image).
> > > >
> > > >I think ValueType might not mean anything in the
> > > >context of an image. However, if we think
> > > itk::Image
> > > >as a special case (accessible through
> > n-dimensional
> > > >index) of generic container, I think having
> > > ValueType
> > > >in Image class makes perfect sense.
> > > >
> > > >Having ValueType in Image makes life of me and
> > > Sayan
> > > >easier. What is you opinion on this?
> > > >
> > > >Thank you,
> > > >
> > > >Jisung.
> > > >
> > > >
> > > >=====
> > > >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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> >
> > =====
> > 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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===============================================
Dr. Stephen R. Aylward
Assistant Professor of Radiology
Adjunct Assistant Professor of Computer Science
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