[Insight-developers] Reading vector images
Miller, James V (Research)
millerjv at crd.ge.com
Wed, 12 May 2004 17:32:36 -0400
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I just tried to read an image of two component vectors into ITK using the
Meta format.
I get all zeros.
It looks to me that in ImageFileReader::GenerateData() there is a test for
m_ImageIO->GetPixelType() == typeid(TOutputImage::PixelType)
TOutputImage::PixelType should be Vector<float, 2>
m_ImageIO->GetPixelType() returns float
The above check for equality fails and a data conversion occurs. The result
is all zeros.
It looks as though people have asked this on the list before but I did not
find a response.
I seem to recall people reading vectors as RGB pixels.
Perhaps if I add a GetPixelType() method to MetaImageIO that checks the
m_PixelType to be VECTOR?
Jim Miller
_____________________________________
Visualization & Computer Vision
GE Research
Bldg. KW, Room C218B
P.O. Box 8, Schenectady NY 12301
millerjv at research.ge.com <mailto:millerjv at research.ge.com>
james.miller at research.ge.com
(518) 387-4005, Dial Comm: 8*833-4005,
Cell: (518) 505-7065, Fax: (518) 387-6981
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<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>I just tried to
read an image of two component vectors into ITK using the Meta
format.</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>I get all
zeros.</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>It looks to me
that in ImageFileReader::GenerateData() there is a test for </FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2> m_ImageIO->GetPixelType() ==
typeid(TOutputImage::PixelType) </FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2>TOutputImage::PixelType should be Vector<float,
2></FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2>m_ImageIO->GetPixelType() returns float</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>The above check
for equality fails and a data conversion occurs. The result is all
zeros.</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>It looks as though
people have asked this on the list before but I did not find a
response.</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>I seem to recall
people reading vectors as RGB pixels.</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana size=2>Perhaps if I add a
GetPixelType() method to MetaImageIO that checks the m_PixelType to be
VECTOR?</FONT></SPAN></DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950332521-12052004><FONT face=Verdana
size=2></FONT></SPAN> </DIV>
<DIV>
<P style="MARGIN: 0in 0in 0pt"><B><SPAN
style="COLOR: navy; FONT-FAMILY: 'Comic Sans MS'">Jim Miller</SPAN></B>
<BR><B><I><SPAN
style="FONT-SIZE: 10pt; COLOR: red; FONT-FAMILY: Arial">_____________________________________</SPAN></I></B><BR><EM><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">Visualization &
Computer Vision</SPAN></EM><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial"><BR><EM>GE
Research</EM><BR><EM>Bldg. KW, Room C218B</EM><BR><EM>P.O. Box 8, Schenectady NY
12301</EM><BR><BR></SPAN></I><EM><U><SPAN
style="FONT-SIZE: 7.5pt; COLOR: blue"><A
href="mailto:millerjv at research.ge.com">millerjv at research.ge.com</A></SPAN></U></EM></P>
<P style="MARGIN: 0in 0in 0pt"><EM><U><SPAN
style="FONT-SIZE: 7.5pt; COLOR: blue">james.miller at research.ge.com</SPAN></U></EM><BR><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">(518) 387-4005, Dial
Comm: 8*833-4005, </SPAN></I><BR><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">Cell: (518) 505-7065,
Fax: (518) 387-6981</SPAN></I> </P></DIV>
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