[ITK Community] Bug in DefaultVectorPixelAccessor

[Jan Ehrhardt]

Hi folks,

I want to iterate through a vector image without an iterator. My 
approach was:

     MultiChannelImageType::AccessorType accessor = 
pImage->GetPixelAccessor();
     MultiChannelImageType::InternalPixelType* pBuffer = 
pImage->GetBufferPointer();

     for( OffsetValueType i = from; i < to; ++i )
     {
         vecPixel = accessor.Get(*pBuffer, i);
     }

but the results are not correct (see bug(?) below). If the bug(?) in 
DefaultVectorPixelAccessor is corrected ( m_OffsetMultiplier = l ) the 
behaviour of standard itk iterators change. I assume, I don't understand 
the parameters of DefaultVectorPixelAccessor::Get() correctly.
How can I use the DefaultVectorPixelAccessor correctly?

best,
jan

On 03/06/2014 12:25 PM, Jan Ehrhardt wrote:
> Hi folks,
>
> there is a bug in DefaultVectorPixelAccessor (ITK 4.4.0):
>
>   void SetVectorLength(VectorLengthType l)
>   {
>     m_VectorLength = l;
>     m_OffsetMultiplier = ( l - 1 );
>   }
>
>   DefaultVectorPixelAccessor(VectorLengthType l)
>   {
>     m_VectorLength = l;
>     m_OffsetMultiplier = l - 1;
>   }
>
> OffsetMultiplier should be m_OffsetMultiplier = l;
>
> Best regards,
> Jan
>