[Insight-users] ShiftscaleImageFilter

Mon, 5 Apr 2004 11:44:36 -0700

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Hi 
I was trying to invert an image using shift scale image filter. But looks
like I am making a mistake because I get a blank image.
I have an unsigned char image. Here is what I am doing

ShiftScaleFilterType::Pointer ssfilter1 = ShiftScaleFilterType::New();
ssfilter1->SetInput(mask);
ssfilter1->SetShift(-255.0);
ssfilter1->SetScale(-1.0);

I put the shift factor as -255, because I checked the code for ShiftScale...
and it calculates the new values as (old_value + shift)*scale, unless I am
misinterpreting this.
Can someone help me figure out where I am making a mistake?
Thanks
Radhika

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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hi <o:p></o:p></span></font></p>

I was trying to invert an image using shift scale =
image
filter. But looks like I am making a mistake =
because I get a
blank image.<o:p></o:p>

I have an unsigned char image. Here is what I am =
doing<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><span class=3DSpellE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>ShiftScaleFilterType::Point=
er</span></font></span><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> ssfilter1 =3D
<span class=3DSpellE>ShiftScaleFilterType::<span =
class=3DGramE>New</span></span><span
class=3DGramE>(</span>);<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>ssfilter1-&gt;<span class=3DSpellE><span =
class=3DGramE>SetInput</span></span><span
class=3DGramE>(</span>mask);<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>ssfilter1-&gt;<span class=3DSpellE><span =
class=3DGramE>SetShift</span></span><span
class=3DGramE>(</span>-255.0);<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>ssfilter1-&gt;<span class=3DSpellE><span =
class=3DGramE>SetScale</span></span><span
class=3DGramE>(</span>-1.0);<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

I put the shift factor as -255, because I checked =
the code
for ShiftScale... and it calculates the new
values as (old_value + shift)*scale, unless =
I am
misinterpreting this.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Can someone help me figure out where I am making a =
mistake?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Radhika<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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<P><FONT SIZE=3D2 FACE=3D"Arial">                                       =
              </FONT></P>

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Confidentiality Notice.

This email message is for the sole use =
of the intended recipient(s) and may contain confidential and =
privileged information. Any unauthorized review, use, disclosure or =
distribution is prohibited. If you are not the intended recipient, =
please contact the sender by reply email and destroy all copies of the =
original message. If you are the intended recipient, please be advised =
that the content of this message is subject to access, review and =
disclosure by the sender's Email System Administrator.

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