[Insight-users] Streaming I/O
Ron Inbar
ron@mediguide.co.il
Tue, 8 Apr 2003 12:31:45 +0200
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In the course of my efforts to implement an ImageIO subclass that supports
streaming, I came across the following code segment (in
itkImageFileWriter.txx):
template <class TInputImage>
void
ImageFileWriter<TInputImage>
::Write(void)
{
// . . .
// Make sure region is within the image, crop if necessary
ImageIORegion ioRegion(TInputImage::ImageDimension);
ImageRegion<TInputImage::ImageDimension> region =
input->GetLargestPossibleRegion();
const double *spacing = input->GetSpacing();
const double *origin = input->GetOrigin();
m_ImageIO->SetNumberOfDimensions(TInputImage::ImageDimension);
for(unsigned int i=0; i<TInputImage::ImageDimension; i++)
{
ioRegion.SetSize(i,region.GetSize(i));
ioRegion.SetIndex(i,region.GetIndex(i));
m_ImageIO->SetDimensions(i,region.GetSize(i));
m_ImageIO->SetSpacing(i,spacing[i]);
m_ImageIO->SetOrigin(i,origin[i]);
}
itkDebugMacro( <<"Region to write = " << ioRegion );
this->Write(ioRegion);
}
My question is: why does it set the ioRegion to the LargestPossibleRegion
and not to the BufferedRegion?
(I tried to change it and on first inspection it seems to work OK with the
BufferedRegion).
Ron
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<div class=Section1>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>In the course of my efforts
to implement an ImageIO subclass that supports streaming, I came across the
following code segment (in itkImageFileWriter.txx):</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>template</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <<font color=blue><span
style='color:blue'>class</span></font> TInputImage></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>void</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>ImageFileWriter<TInputImage></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>::Write(<font color=blue><span
style='color:blue'>void</span></font>)</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>{</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> // . . .</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=green><span
style='color:green'>// Make sure region is within the image, crop if necessary</span></font></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> ImageIORegion ioRegion(TInputImage::ImageDimension);</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> ImageRegion<TInputImage::ImageDimension>
region = </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
input->GetLargestPossibleRegion();</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>const</span></font> <font color=blue><span style='color:
blue'>double</span></font> *spacing = input->GetSpacing();</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>const</span></font> <font color=blue><span style='color:
blue'>double</span></font> *origin = input->GetOrigin();</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> m_ImageIO->SetNumberOfDimensions(TInputImage::ImageDimension);</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>for</span></font>(<font color=blue><span style='color:blue'>unsigned</span></font>
<font color=blue><span style='color:blue'>int</span></font> i=0; i<TInputImage::ImageDimension;
i++)</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> {</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> ioRegion.SetSize(i,region.GetSize(i));</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> ioRegion.SetIndex(i,region.GetIndex(i));</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> m_ImageIO->SetDimensions(i,region.GetSize(i));</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> m_ImageIO->SetSpacing(i,spacing[i]);</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> m_ImageIO->SetOrigin(i,origin[i]);</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> }</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> itkDebugMacro(
<<"Region to write = " << ioRegion );</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>this</span></font>->Write(ioRegion);
</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>}</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>My question is: why does it set
the ioRegion to the LargestPossibleRegion and not to the BufferedRegion?</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>(I tried to change it and on
first inspection it seems to work OK with the BufferedRegion).</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Ron</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
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