<font><font face="verdana,sans-serif">You cannot access intermediate image used in a filter. You would have to modify the code of the filter in order to visualize the computation process.</font></font><div><font><font face="verdana,sans-serif"><br>
</font></font></div><div><font><font face="verdana,sans-serif">In order to figure out the actual formula used, you need to take a look at the GenerateData method in this file:</font></font></div><div><font><font face="verdana,sans-serif">ITK4\Modules\Filtering\ImageGradient\include\itkGradientMagnitudeRecursiveGaussianImageFilter.hxx<br>
</font></font></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Dec 4, 2012 at 2:00 PM, Xiaopeng Yang <span dir="ltr"><<a href="mailto:yxp233@postech.ac.kr" target="_blank">yxp233@postech.ac.kr</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal">Hello everyone,<u></u><u></u></p><p class="MsoNormal">
<u></u> <u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">I have two questions regarding ITK Gradient Magnitude Recursive Gaussian Image Filter:<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p><u></u><span style="font-family:"Arial","sans-serif""><span>1)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-family:"Arial","sans-serif"">In this filter, as far as we know, a <b><span style="color:#c00000">finite difference approach</span></b> is used to calculate gradient magnitude of an image. My question is <b><span style="color:#c00000">what formula is used</span></b> by the finite difference approach implemented in this filter?<u></u><u></u></span></p>
<p><u></u><span style="font-family:"Arial","sans-serif""><span>2)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-family:"Arial","sans-serif"">The ITK Software Guide tells us that the computation process of this filter is equivalent to first <b><span style="color:#c00000">smoothing the image </span></b>by convolving it with a Gaussian kernel and then applying a differential operator. My question is that is there a way to get <b><span style="color:#c00000">an output of the smoothed image</span></b>? I want to visualize the computation process.<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">If any of you have any idea regarding the two questions, it would be very appreciated if you share it with me. Thank you in advance.<u></u><u></u></p><p class="MsoNormal">
<u></u> <u></u></p><p class="MsoNormal">Best regards,<u></u><u></u></p><p class="MsoNormal">Yang<u></u><u></u></p></div></div><br>_______________________________________________<br>
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