<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"><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>It not uncommon for resampling-type algorithms to have some points be mapped out side the the domain. This is why a boundary condition and extrapolators are used. If there are just a limited number of pixel being mapped out side, then the simplest way be by to just check if the pixel is within the image's region.</div><div><br></div><div>ITK's registration frameworks solve for a transform which maps from the "Fixed" image to the "Moving" image. This is well described int Chapter Eight of the old Software guide:</div><div><br></div><div><a href="http://www.itk.org/ItkSoftwareGuide.pdf">http://www.itk.org/ItkSoftwareGuide.pdf</a></div><div><br></div><div>Brad</div><div><br><div><div>On Dec 8, 2013, at 6:38 PM, Tim Bhatnagar <<a href="mailto:tim.bhatnagar@gmail.com">tim.bhatnagar@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div><div>Hello,<br><br></div>I've created a displacement field via Demons non-rigid registration. I am now trying to create the inverse (using InverseDisplacementFieldImageFilter), but when I am using the indexes to ascribe the inverted field, my program crashes mid-way through, because it appears I am trying to call a <b>negative</b> index (specifically, the 3rd index parameter.. the 'z'-parameter).<br>
<br>I don't do anything to the displacement field except write it to a vtk file before i invert it.. can anyone suggest a solution? I thought I could try and specify the 'direction' of the field, but I'm not sure where in my pipeline I can set the direction of the <b>inverted</b> displacement field...<br>
<br></div>sorry if that's messy.. any thoughts would be appreciated!<br><br>Thanks,<br><br>Tim<br clear="all"><div><br>-- <br>Tim Bhatnagar<br>PhD Candidate<br>Orthopaedic Injury Biomechanics Group<br>Department of Mechanical Engineering<br>
University of British Columbia<br><br>Rm 5000 - 818 West 10th Ave.<br>Vancouver, BC<br>Canada<br>V5Z 1M9<br><br>Ph: (604) 675-8845<br>Fax: (604) 675-8820<br>Web: <a href="http://oibg.mech.ubc.ca/" target="_blank">oibg.mech.ubc.ca</a><br>
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