[Insight-developers] Adding ValueType to itk::Image
Miller, James V (CRD)
millerjv@crd.ge.com
Fri, 22 Feb 2002 10:00:20 -0500
Here's another curve:
In some applications, the x and y coordinates of a point may be prescribed
but the z coordinate and value at that point may be measurements.
So you might want to treat (x,y) as independent variables and (z, v) as
dependent variables.
We might be able to do this with some sort of adaptor or functor.
-----Original Message-----
From: Jisung Kim [mailto:bahrahm@yahoo.com]
Sent: Thursday, February 21, 2002 5:04 PM
To: Miller, James V (CRD); Luis Ibanez
Cc: insight-dev-list
Subject: RE: [Insight-developers] Adding ValueType to itk::Image
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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>
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