<div dir="ltr"><span id="result_box" class="" lang="en"><span class="">I get that my</span> <span class="">program does not take</span> <span class="">into account the</span> <span class="">header</span> <span class="">files from my</span> <span class="">optimizer</span><span> ,</span> <span class="">as</span> <span class="">when I tried</span> <span class="">to modify the</span> <span class="">header</span> <span class="">file</span> <span class="">optimizer</span> <span class="">so that it displays</span> <span class="">me</span> <span class="">an</span> <span class="">error</span> <span class="">!! when</span> <span class="">I did the</span> <span class="">compilation</span> <span class="">it works</span> <span class="">without any error !<br>
<br> Would you give me some hint of that please, thanks <br></span></span></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/11/28 Brian Helba <span dir="ltr">&lt;<a href="mailto:brian.helba@kitware.com" target="_blank">brian.helba@kitware.com</a>&gt;</span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">I would try some much larger maximum step values. You program appears to be spending iterations while not making very much progress at the start.</p>

<p dir="ltr">Also, when you&#39;re tuning things, it can be helpful to print the moving image parameters on each iteration, in addition to the cost function.</p>
<div class="gmail_quote"><div><div class="h5">On Nov 27, 2013 5:42 PM, &quot;Hana Cherif&quot; &lt;<a href="mailto:hanacherif62@gmail.com" target="_blank">hanacherif62@gmail.com</a>&gt; wrote:<br type="attribution"></div>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr"><div><div><br></div>Hello every body !<br><br><br></div><div>After execution of my images&#39; registration program , using this components:<br><br></div><div>Regular Step Gradient Descent Optimizer,<br>Mean Squares Image  To Image Metric<br>


</div><div>Bspline interpolator<br><br> I get this results::<br><br><br>Iteration number:     Cost function value        <br><br><br>0                        2732.74                <br>1                        2700.84                <br>


2                        2699.27                <br>3                        2701.48                <br>4                        2703.19                <br>5                        2700                <br>6                        2704.12                <br>


7                        2705.1                <br>8                        2705.27                <br>9                        2705.4                <br>10                        2702.91                <br>11                        2705.15                <br>


12                        2713.1                <br>13                        2720.48                <br>14                        2720                <br>15                        2715.81                <br>16                        2704.64                <br>


17                        2687.46                <br>18                        2666.14                <br>19                        2639.91                <br>20                        2613.11                <br>21                        2587.55                <br>


22                        2564.89                <br>23                        2546.22   <br><br></div><div>I use this parameters:<br> optimizer-&gt;SetMaximumStepLength(0.10 );<br> optimizer-&gt;SetMinimumStepLength( 0.05);<br>


 optimizer-&gt;SetRelaxationFactor(0.5);<br><br></div><div>My question is : as you see i the results the value of the cost function increases i want to know why can be the reason of this results please!! is it just a probleme of parameters??<br>


<br></div><div>Thanks !<br></div><div><br></div><div><br></div></div>
<br></div></div>_____________________________________<br>
Powered by <a href="http://www.kitware.com" target="_blank">www.kitware.com</a><br>
<br>
Visit other Kitware open-source projects at<br>
<a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>
<br>
Kitware offers ITK Training Courses, for more information visit:<br>
<a href="http://www.kitware.com/products/protraining.php" target="_blank">http://www.kitware.com/products/protraining.php</a><br>
<br>
Please keep messages on-topic and check the ITK FAQ at:<br>
<a href="http://www.itk.org/Wiki/ITK_FAQ" target="_blank">http://www.itk.org/Wiki/ITK_FAQ</a><br>
<br>
Follow this link to subscribe/unsubscribe:<br>
<a href="http://www.itk.org/mailman/listinfo/insight-users" target="_blank">http://www.itk.org/mailman/listinfo/insight-users</a><br>
<br>_______________________________________________<br>
Community mailing list<br>
<a href="mailto:Community@itk.org" target="_blank">Community@itk.org</a><br>
<a href="http://public.kitware.com/cgi-bin/mailman/listinfo/community" target="_blank">http://public.kitware.com/cgi-bin/mailman/listinfo/community</a><br>
<br></blockquote></div>
</blockquote></div><br></div>