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

[Miller, James V (CRD)]

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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