<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Hi Artem,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">looking at the Wikipedia <a href="https://en.wikipedia.org/wiki/Sobel_operator">article</a>, the first reference is this:</div><div class="gmail_default" style=""><font face="verdana, sans-serif"><a href="https://www.researchgate.net/publication/239398674_An_Isotropic_3_3_Image_Gradient_Operator">https://www.researchgate.net/publication/239398674_An_Isotropic_3_3_Image_Gradient_Operator</a></font><br></div><div class="gmail_default" style=""><font face="verdana, sans-serif"><br></font></div><div class="gmail_default" style=""><font face="verdana, sans-serif">HTH,</font></div><div class="gmail_default" style=""><font face="verdana, sans-serif">Dženan</font></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 24, 2016 at 4:59 AM, Artem Amirkhanov <span dir="ltr"><<a href="mailto:artem.ogre@gmail.com" target="_blank">artem.ogre@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hello,<br><br></div>In the documentation of SobelOperator (<a href="http://www.itk.org/Doxygen/html/classitk_1_1SobelOperator.html" target="_blank">http://www.itk.org/Doxygen/html/classitk_1_1SobelOperator.html</a>) the original technical report by Irwin Sobel is mentioned: "Irwin Sobel. An Isotropic 3x3x3 Volume Gradient Operator.
Technical report, Hewlett-Packard Laboratories, April 1995."<br><br></div>This paper is nowhere to be found online and ITK is basically the only place that refers to it. Could anyone please provide this paper to me? I would really like to clarify some moments in the derivation of the operator.<br><br></div>Thank you,<br></div>Artem<br></div>
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