[Insight-users] Bug Report: itkZeroFluxNeumannBoundaryCondition.h

[Cory Quammen]

Mengqiu,

I cannot reproduce the behavior you are seeing. Please see the
attached program and CMakeLists.txt file that exercises the four pad
image filters. They all behave the same way, that is, the 0 index
corresponds to padding in the x direction and the 1 index corresponds
to the y direction.

Cheers,
Cory

On Fri, Feb 17, 2012 at 6:47 AM, Mengqiu Tian <tianmengqiu at gmail.com> wrote:
> Hi Cory and David,
>
> Thanks for reply.
> Actually, I tried both MirrorPadImageFilter and
> ZeroFluxNeumannPadImageFilter. Unfortunately, in MirrorPadImageFilter, the 0
> indices  width but in ZeroFluxNeumannPadImageFilter it behaves opposite way.
> Regarding the general view of image, I think 0 indices height would be more
> reasonable, similar as behavior in Matlab.
> It is ok if it would not be corrected, I just swap my codes :)
>
> Regards,
> Mengqiu
>
>
>
> On Fri, Feb 17, 2012 at 3:43 AM, Cory Quammen <cquammen at cs.unc.edu> wrote:
>>
>> Thanks for the report. I think the figures for the other
>> PadImageFilter filters are wrong. The indices 0 and 1 should be
>> swapped in the figures.
>>
>> David, I think you made these figures originally. Do you concur that
>> the indices should be swapped in the figures?
>>
>> Thanks,
>> Cory
>>
>> On Thu, Feb 16, 2012 at 12:03 PM, Mengqiu Tian <tianmengqiu at gmail.com>
>> wrote:
>> > Hi all,
>> >
>> > I am using itkZeroFluxNeumannPadImageFilter.h to pad my image, here I
>> > found
>> > a bug.
>> >
>> > According to other PadImageFilter, take MirrorPadImageFilter for
>> > example:
>> >
>> > http://www.itk.org/Doxygen/html/classitk_1_1MirrorPadImageFilter.html
>> >
>> > lowerBound[0] and upperBound[0] should correspond to vertical direction.
>> >
>> > But ZeroFluxNeumannPadImageFilter does not consist with this behavior.
>> > lowerBound[0] and upperBound[0] corrspond to horizontal direction in
>> > this
>> > case.
>> > Although it is not a big deal, it might cause misunderstanding. I think
>> > it
>> > is better to correct it.
>> >
>> > Hope it helps. :)
>> >
>> > Regards,
>> > Mengqiu Tian
>> >
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>>
>>
>>
>> --
>> Cory Quammen
>> Research Associate
>> Department of Computer Science
>> The University of North Carolina at Chapel Hill
>
>



-- 
Cory Quammen
Research Associate
Department of Computer Science
The University of North Carolina at Chapel Hill
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cmake_minimum_required(VERSION 2.6)

project(PadImageFilters)

find_package(ITK)
include(${ITK_USE_FILE})
 
add_executable(PadImageFilters PadImageFilters.cxx)
target_link_libraries(PadImageFilters ${ITK_LIBRARIES})
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