[Insight-users] How to get rid of noise in image
Jiang
jiang@TI.Uni-Trier.DE
Tue May 4 16:30:08 EDT 2004
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Dear ITK users,
Is there an efficient method to get rid of noise from image?
I want to extract edge from one image. And I use
itk::CannyEdgeDetectionImageFilter
It works fine. However, my image is very noisy, so the result of edge
extraction has many unwanted edge lines.
I try to use
Itk::GradientAnisotropicDiffusionImageFilter
to smooth the image, and set the parameters as follow:
SmoothFilter->SetNumberOfIterations( 5 );
SmoothFilter->SetTimeStep( 0.25 );
SmoothFilter->SetConductanceParameter( 3.0f );
It works more or less, but not perfect.
Could some one tell me how to remove those noises in order to get
correct edge extraction result?
Thanks a lot!
Chunyan Jiang
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<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>Dear
ITK users,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>Is
there an efficient method to get rid of noise from =
image?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>I
want to extract edge from one image. And I use =
<o:p></o:p></span></font></p>
<p class=3DMsoNormal><span class=3DSpellE><font size=3D1 =
face=3DArial><span lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'>itk::CannyEdgeDetectionImageFilter</span></font></span><font =
size=3D1
face=3DArial><span lang=3DEN-GB =
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;
font-family:Arial;mso-ansi-language:EN-GB'><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>It
works fine. However, my image is very noisy, so the result of edge =
extraction
has many unwanted edge lines. <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>I
try to use <o:p></o:p></span></font></p>
<p class=3DMsoNormal><span class=3DSpellE><font size=3D1 =
face=3DArial><span lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'>Itk::GradientAnisotropicDiffusionImageFilter</span></font></span><=
font
size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:9.0pt;mso-bidi-font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p></o:p></span></fon=
t></p>
<p class=3DMsoNormal><span class=3DGramE><font size=3D1 =
face=3DArial><span lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'>to</span></font></span><font size=3D1 face=3DArial><span =
lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'> smooth the image, and set the parameters as =
follow:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><span
style=3D'mso-tab-count:1'>  =
; </span><span
class=3DSpellE>SmoothFilter</span>-><span class=3DSpellE><span =
class=3DGramE>SetNumberOfIterations</span></span><span
class=3DGramE>(</span> 5 );<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><span
style=3D'mso-tab-count:1'>  =
; </span><span
class=3DSpellE>SmoothFilter</span>-><span class=3DSpellE><span =
class=3DGramE>SetTimeStep</span></span><span
class=3DGramE>(</span> 0.25 );<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><span
style=3D'mso-tab-count:1'>  =
; </span><span
class=3DSpellE>SmoothFilter</span>-><span class=3DSpellE><span =
class=3DGramE>SetConductanceParameter</span></span><span
class=3DGramE>(</span> 3.0f );<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>It
works more or less, but not perfect.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>Could
some one tell me how to remove those noises in order to get correct edge
extraction result?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'>Thanks
a lot!<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB=
'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><span class=3DSpellE><font size=3D1 =
face=3DArial><span lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'>Chunyan</span></font></span><font size=3D1 face=3DArial><span =
lang=3DEN-GB
style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt;font-family:Arial;mso-=
ansi-language:
EN-GB'> <span class=3DSpellE>Jiang</span><o:p></o:p></span></font></p>
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