<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>Hi, <br><br>Please can you tell me how can i run the vesslenessmeasure example.cxx on windows xp<br>because i still have the same problem on running any example. Can you please give me step by step the instruction from the begining (just after building the project with cmake) to obtain the result file, i have visual studio 8 (2005).<br>Thank you <br>syrine<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size: 13px;"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">De :</span></b> Oleksandr Dzyubak <adzyubak@gmail.com><br><b><span style="font-weight: bold;">À :</span></b> "Atwood, Robert (DLSLtd,RAL,DIA)"
<Robert.Atwood@diamond.ac.uk><br><b><span style="font-weight: bold;">Cc :</span></b> insight-users@itk.org<br><b><span style="font-weight: bold;">Envoyé le :</span></b> Mercredi, 19 Août 2009, 0h19mn 14s<br><b><span style="font-weight: bold;">Objet :</span></b> Re: [Insight-users] itkHessian3DToVesselnessMeasureImageFilter false aura at the ends<br></font><br>Hi Robert,<br><br>Junctions and intersections -- that is another story and another issue<br>which has to be solved.<br><br>At this point I am talking about the ends of the "vessels".<br>As you could see from the pictures I sent before, the filter generates highly undesirable<br>spherical "caps" at the ends. Those "additional volumes" even do not<br>belong to the vessels. They are in "close premises". If you take a closer look,<br>you can find that there is a void volume between the vessel end and the spherical cap.<br><br>When you dig deeper, you can find that those "caps"<br>are
actually generated by the RecursiveGaussian filter which is used to evaluate<br>the second order partial derivatives. And that filter works correctly since at the edges<br>there is a jump of intensities.<br><br>As itkHessian3DToVesselnessMeasureImageFilter manipulates with Hessian eigenvalues,<br>it should reflect the eigenvalue change along the principal major axis (along the vessel).<br>So when analyzing the object shape, the filter should catch these caps and reject them<br>as it does with minor axis (tangential). In fact, it does not.<br><br>In publications about Hessian-based shape analyzers, I have never seen this effect<br>"producing additional volumes around the vessel ends"... Did you?<br><br>Your suggestion to analyze original image in concert with the vesselness image<br>and based on this additional analysis ultimately generate a good final vesselnes image is good.<br><br>But correct me if I am wrong.<br>Isn't the
itkHessian3DToVesselnessMeasureImageFilter supposed to do that?<br><br>I am wondering, is it a bug or normal behavior?<br><br>If it is a bug, lets fix a bug. If it is normal, then go ahead and use your approach.<br><br><br>Still would like to know the ITK users' opinion.<br><br>Regards,<br><br>Alex<br><br><br>Atwood, Robert (DLSLtd,RAL,DIA) wrote:<br>> Hi, Alex:<br>> I used that filter and observed that sort of effect (actually a<br>> decreased value at intersections in my case) but I understood it to be<br>> a consequence of the maths; these pixels satisfy the criteria, what I<br>> did was require a certain value in the original in combination with a<br>> certain value in the filtered result to accept pixels as belonging to my<br>> 'vessels', if the original value was quite high but 'vesselness' low<br>> then it could be a junction, if the original value too low then the<br>> pixel could be rejected even with a moderate
"vessellness" value <br>> But, if this is the wrong approach I should like to know !<br>> <br>> Thanks<br>> <br>> <br>> Robert<br>> <br>> <br>> -----Original Message-----<br>> From: <a ymailto="mailto:insight-users-bounces@itk.org" href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a><br>> [mailto:<a ymailto="mailto:insight-users-bounces@itk.org" href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a>] On Behalf Of Oleksandr Dzyubak<br>> Sent: 18 August 2009 00:23<br>> To: <a ymailto="mailto:insight-users@itk.org" href="mailto:insight-users@itk.org">insight-users@itk.org</a><br>> Subject: [Insight-users] itkHessian3DToVesselnessMeasureImageFilter<br>> falseaura at the ends<br>> <br>> <br>> Dear community,<br>> <br>> I played with the itkHessian3DToVesselnessMeasureImageFilter class using<br>> the example from the ITK distro
"VesselnessMeasureImageFilter.cxx"<br>> and found some side-effect.<br>> <br>> The filter produces false broadenings ("spherical auras") at the ends of<br>> vessels.<br>> In attachment I am sending the pictures to demonstrate the effect.<br>> <br>> Has anybody experienced similar effect?<br>> Is there any recipe to avoid/reduce this?<br>> <br>> Thanks,<br>> <br>> Alex<br>> <br>> <br>> This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.<br>> Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd.
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