On 3/26/08, <b class="gmail_sendername">Fab_83</b> <<a href="mailto:Fabian_Eisa@gmx.de">Fabian_Eisa@gmx.de</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br> Hi everybody,<br> <br> I want to use Peak Signal noise ratio </blockquote><div><br>ITK has an MSE metric and you could compute the PSNR from that.<br><br>PSNR is almost equivalent to MSE, except that its nicer (cause its dynamic range invariant :) )<br>
<br>PSNR = 20*log10( 255 /MSE)<br><br>the units being dB. <br><br>That's for an UCHAR image. For CT, you should replace 255 with 4095.<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
and sum of absolut distance as a<br> metric for CT-Registration. </blockquote><div><br>As Luis suggested you should write your own metric for this.<br></div><br>HTH<br>--<br>karthik<br></div>