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<font size="-1"><font face="Arial">Hello, Chester,<br>
<br>
If you open the vector field (VF) as a regular image, the value
displayed is meaningless </font></font><font size="-1"><font
face="Arial">in practice, yet cool to look at..</font></font><font
size="-1"><font face="Arial">. ;-) We don't even know what it is,
to be honest, but it seems to be related to how the image
conversion between ITK and VTK is done. However, if you open the
VF in overlay mode (menu "Overlay"/"Add deformation field to
current image" or </font></font><font size="-1"><font
face="Arial">click with the </font></font><font size="-1"><font
face="Arial">right mouse button on the image file) what is shown
in the overlay tab is the magnitude of the vector at the pixel
location and you will also see the arrows corresponding to
vectors on the image. Actually, it is better (and much cooler!)
to always use the overlay mode for VF visualization.<br>
<br>
Hope it helps.<br>
Kind regards,<br>
<br>
Rômulo<br>
</font></font><br>
<pre class="moz-signature" cols="72">--
Rômulo PINHO
Post-doc Research Engineer
Centre Léon Bérard
28, rue Laennec 69373
Lyon, France
+33 (0)4 78 78 51 50
<a class="moz-txt-link-abbreviated" href="mailto:romulo.pinho@lyon.unicancer.fr">romulo.pinho@lyon.unicancer.fr</a>
<a class="moz-txt-link-freetext" href="http://www.creatis.insa-lyon.fr/rio/RomuloPinho">http://www.creatis.insa-lyon.fr/rio/RomuloPinho</a>
</pre>
<br>
<br>
On 05/11/2012 07:04 AM, 黄成 wrote:
<blockquote
cite="mid:CANmBxvVKMuz41vwiVvOvvE79xoh9Ss5anZLk1FRfm11UVPzExw@mail.gmail.com"
type="cite">Hi all,
<div><br>
</div>
<div> I notice that if I load a vector image using "vv",
this application will assign a double value for every pixel. How
is this value calculated? Is this value equal to the pixel
vector point multiply its gradient vector? If that, how is the
gradient vector calculated?<br clear="all">
<div><br>
</div>
-- <br>
<div>Chester Huang</div>
<div><br>
</div>
<div>Shenzhen Institutes of Advanced Technology,Chinese Academy
of Sciences</div>
<div><br>
</div>
<div>Address:Human-Computer Interaction Center ,No.1068,Xueyuan
Road,Xili University Town,Nanshan District,Shenzhen
City，518055</div>
<br>
</div>
<pre wrap="">
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</pre>
</blockquote>
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