<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello,<div><br></div><div>The GetBufferPointer is a method, and I would try to avoid that in a tight loop.</div><div><br></div><div>Here is a recent implementation to efficiently copy ITK regions:</div><div><a href="https://github.com/Kitware/ITK/blob/master/Modules/Core/Common/include/itkImageAlgorithm.hxx#L137">https://github.com/Kitware/ITK/blob/master/Modules/Core/Common/include/itkImageAlgorithm.hxx#L137</a></div><div><br></div><div>We have found that std::copy is a very robust and efficient way to copy the buffers with modern compilers. It can even work when a conversion is needed.</div><div><br></div><div>If you have validated the buffer is continuous and is the correct type and size. I would recommend just getting the raw buffer pointer and using std::copy. It may be up to 10-100X faster than your implementation below.</div><div><br></div><div><br><div><div>On Oct 18, 2013, at 11:28 AM, Luca Tersi <<a href="mailto:lucatersi@gmail.com">lucatersi@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Hi,<br><br>I've included some algorithms developed with Matlab in my C++ software. The Matlab algorithms were translated to C++ using Matlab Coder.<br>I've some images that have to be passed back and forth from the itk pipeline to the Matlab algorithm that work with emxArray data type.<br>
I've made the following methods in order to copy the data, but is there any better and faster method? Moreover, is it better to use iterators or access the buffer directly?<br><br>void ImageProcessing::CopyItkToMatlabImage(ImageProcessing::RealImageType::Pointer itkI, emxArray_real_T *matlabI)<br>
{<br> RealImageType::SizeType size = itkI->GetLargestPossibleRegion().GetSize();<br><br> for (int ii=0; ii < size[0]; ++ii)<br> for (int jj=0; jj < size[1]; ++jj)<br> {<br> matlabI->data[ii*size[0]+jj] = (real_T)itkI->GetBufferPointer()[ii*size[0]+jj];<br>
}<br>}<br><br><br><br>void ImageProcessing::CopyMatlabToItkImage(emxArray_real_T * matlabI, ImageProcessing::RealImageType::Pointer itkI)<br>{<br><br> int32_T *size = matlabI->size;<br> RealIteratorType out ( itkI, itkI->GetLargestPossibleRegion() );<br>
out.GoToBegin();<br><br> for (int ii=0; ii < size[0]; ++ii)<br> for (int jj=0; jj < size[1]; ++jj)<br> {<br> out.Set(matlabI->data[ii*size[0]+jj]);<br> ++out;<br> }<br>}<br><br>Thanks a lot<br>
<br>Luca<br clear="all"><div><font style="font-size:x-small"><br>
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