<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">On Nov 27, 2013 5:42 PM, &quot;Hana Cherif&quot; &lt;<a href="mailto:hanacherif62@gmail.com">hanacherif62@gmail.com</a>&gt; wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<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>
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