[Insight-developers] NumericTraits' AccumulateType question.

[Jisung Kim]

Thank you for the clarification.


--- "Miller, James V (Research)" <millerjv at crd . ge . com>
wrote:
> Usually AccumulateType is defined as the smallest
> type that can hold
> the sum of two variables of a particular type.
> 
> You can always use RealType for the accumulation of
> many variables.
> 
> > -----Original Message-----
> > From: Jisung Kim [mailto:bahrahm at yahoo . com]
> > Sent: Thursday, July 24, 2003 3:02 PM
> > To: insight-dev-list
> > Subject: [Insight-developers] NumericTraits'
> AccumulateType question.
> > 
> > 
> > Hi.
> > 
> > I just found out very interesting aspect of ITK
> > NumericTraits while I was testing my mean shift
> > blurring classes.
> > 
> > Inside of the mean shift mode seeking class, I
> > declared the temporary sum of measurement vectors
> in a
> > spherical kernel using NumericTraits< unsigned
> char
> > >::AccumulateType. The input data is an unsigned
> char
> > image of 256 x 256 pixels. The AccumulateType is
> > unsigned short of which max value is 65535. If the
> > pixel value is 255, then the sum of 257 pixels
> exceeds
> > the limit of unsigned short. 
> > 
> > My suggestion is that all UNSIGNED integer types
> have
> > "unsigned long" as AccumulateType and all SIGNED
> > integer types have "long" as AccumulateType. 
> > 
> > Along the same line of suggestion, should the
> > AccumulateType of float and double be long double?
> > 
> > Thanks,
> > 
> > Jisung.
> > 
> > =====
> > Jisung Kim
> > bahrahm at 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 at 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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