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hm seems that my png file is a jpeg in disguise. i have got no clue
where this could have happened. I've got it to work with another png
file. But now i have another issue, the resulting image is just
black (shoud be canny edges). <br>
<br>
Am 24.05.2012 02:17, schrieb Sebastian Losch:
<blockquote
cite="mid:CAG4NwVqchzrN79dYh59DOe5OkL1zzgZ2Vz_BD0V+WZhxy4Sivw@mail.gmail.com"
type="cite">Hi Luis,
<div><br>
</div>
<div> i attached the .png file to this email. It's a beauitiful
picture of myself, shot with a cheap webcam ;) </div>
<div><br>
</div>
<div>Thanks, Sebastian<br>
<br>
<div class="gmail_quote">2012/5/24 Luis Ibanez <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:luis.ibanez@kitware.com" target="_blank">luis.ibanez@kitware.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
Sebastian,
<div><br>
</div>
<div>Could you please send me that .png file ?</div>
<div><br>
</div>
<div> Thanks</div>
<div>
<br>
</div>
<div><br>
</div>
<div> Luis<br>
<br>
<br>
-----------------
<div>
<div class="h5"><br>
<div class="gmail_quote">On Wed, May 23, 2012 at 7:47
PM, Sebastian Losch <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:seb.losch@googlemail.com"
target="_blank">seb.losch@googlemail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hi Luis!<br>
<br>
Thanks for your response. As i wrote in my first
post the .png file is in the same folder as the
executable, so that cannot be the reason. When i
change the filename to something different (e.g.
to a file which does not exists) then itk throws
a different exception (file not found). <br>
<br>
Sebastian<br>
<br>
Am <a moz-do-not-send="true"
href="tel:24.05.2012%2001"
value="+12405201201" target="_blank">24.05.2012
01</a>:40, schrieb Luis Ibanez:
<div>
<div>
<blockquote type="cite">Hi Sebastian,
<div><br>
</div>
<div>You are using a plain filename
(instead of a full path)</div>
<div>to point to your image:</div>
<div><br>
</div>
<div>
<div><span style="white-space:pre-wrap">
</span>reader->SetFileName("input.png");</div>
<div><br>
</div>
<br>
The factories are telling you that the
file</div>
<div><br>
</div>
<div> "input.png"</div>
<div><br>
</div>
<div>is not in the same directory that
the executable </div>
<div>that you build with Visual Studio.</div>
<div><br>
</div>
<div><br>
</div>
<div>You may want to try one of these tree
options:</div>
<div><br>
</div>
<div><br>
</div>
<div>1) Use a full path to point to your
image,</div>
<div> something like:</div>
<div><br>
</div>
<div> C:\MyImages\input.png</div>
<div> </div>
<div>or</div>
<div> </div>
<div>2) Copy the image to where the
executable is</div>
<div><br>
</div>
<div>or</div>
<div><br>
</div>
<div>3) Copy the executable to where the
image is</div>
<div> and run the executable from that
directory<br>
<br>
<br>
<br>
Option (1) is probably the best way to
go.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Ideally your code should have been:</div>
<div><br>
</div>
<div><br>
</div>
<div>A) If using a command line approach</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>reader->SetFileName(
argv[1] );<br>
</div>
<div> </div>
<div>or,</div>
<div><br>
</div>
<div>B) If using a GUI to get the filename
from the user:</div>
<div><br>
</div>
<div> const char * filename =
GetMeAFileNameFromGUI();</div>
<div><br>
<div><span style="white-space:pre-wrap">
</span>reader->SetFileName(
filename );<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div> Hope this helps,</div>
<div><br>
</div>
<div><br>
</div>
<div> Luis</div>
<div><br>
</div>
<div><br>
</div>
-----------------------------------------<br>
<div class="gmail_quote">On Tue, May 22,
2012 at 4:35 AM, Sebastian Losch <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:seb.losch@googlemail.com"
target="_blank">seb.losch@googlemail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex"> Hi!
<div><br>
</div>
<div>I am having problems getting
the ImageFileReader and
ImageFileWriter to work. I just
want to read a PNG File, apply a
filter and write it back to the
harddrive. I found out that there
is a problem in 4.1 with the
ImageIOFactory registration, so i
register the PNGFactory manually.
The .png file is in the same
folder as the executable. Here is
my Code:</div>
<div><br>
</div>
<div>
<div>#include "itkImage.h"</div>
<div>#include
"itkImageFileReader.h"</div>
<div>#include
"itkImageFileWriter.h"</div>
<div>#include
"itkCannyEdgeDetectionImageFilter.h"</div>
<div>#include
"itkObjectFactoryBase.h"</div>
<div>#include
"itkPNGImageIOFactory.h"</div>
<div><br>
</div>
<div>int main(int argc, char
*argv[])</div>
<div>{</div>
<div><span
style="white-space:pre-wrap">
</span>itk::ObjectFactoryBase::RegisterFactory(itk::PNGImageIOFactory::New());</div>
<div><br>
</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>double variance = 2.0;</div>
<div><span
style="white-space:pre-wrap">
</span>double upperThreshold =
0.0;</div>
<div><span
style="white-space:pre-wrap">
</span>double lowerThreshold =
0.0;</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>typedef
itk::Image<double, 2>
DoubleImageType;</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>typedef
itk::ImageFileReader<DoubleImageType>
ReaderType;</div>
<div><span
style="white-space:pre-wrap">
</span>ReaderType::Pointer
reader = ReaderType::New();</div>
<div><span
style="white-space:pre-wrap">
</span>reader->SetFileName("input.png");</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>typedef
itk::CannyEdgeDetectionImageFilter
<DoubleImageType,
DoubleImageType></div>
<div><span
style="white-space:pre-wrap">
</span>CannyEdgeDetectionImageFilterType;</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>CannyEdgeDetectionImageFilterType::Pointer
cannyFilter =
CannyEdgeDetectionImageFilterType::New();</div>
<div><span
style="white-space:pre-wrap">
</span>cannyFilter->SetInput(reader->GetOutput());</div>
<div><span
style="white-space:pre-wrap">
</span>cannyFilter->SetVariance(
variance );</div>
<div><span
style="white-space:pre-wrap">
</span>cannyFilter->SetUpperThreshold(
upperThreshold );</div>
<div><span
style="white-space:pre-wrap">
</span>cannyFilter->SetLowerThreshold(
lowerThreshold );</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>typedef
itk::ImageFileWriter<DoubleImageType>
WriterType;</div>
<div><span
style="white-space:pre-wrap">
</span>WriterType::Pointer
writer = WriterType::New();</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>writer->SetFileName("test.png");</div>
<div><span
style="white-space:pre-wrap">
</span>writer->SetInput(cannyFilter->GetOutput());</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>try {</div>
<div><span
style="white-space:pre-wrap">
</span>writer->Update();</div>
<div><span
style="white-space:pre-wrap">
</span>} catch
(itk::ExceptionObject &e) {</div>
<div><span
style="white-space:pre-wrap">
</span>std::cerr << e
<< std::endl;</div>
<div><span
style="white-space:pre-wrap">
</span>}</div>
<div><br>
</div>
<div><span
style="white-space:pre-wrap">
</span>std::cout << "ENDE"
<< std::endl;</div>
<div>}</div>
</div>
<div><br>
</div>
<div>and this is the error:</div>
<div><br>
</div>
<div>
<div>itk::ImageFileReaderException
(0059E4A8)</div>
<div>Location: "void __thiscall
itk::ImageFileReader<class
itk::Image<double,2>,class itk::DefaultConvertPixelTraits<double>
>::GenerateOutputInformation(void)"</div>
<div>File:
c:\libs\itk\include\itk-4.1\itkimagefilereader.hxx</div>
<div>Line: 143</div>
<div>Description: Could not
create IO object for file
input.png</div>
<div> Tried to create one of the
following:</div>
<div> PNGImageIO</div>
<div> You probably failed to set
a file suffix, or</div>
<div> set the suffix to an
unsupported type.</div>
</div>
<div><br>
</div>
<div><br>
</div>
<div>What am i doing wrong?</div>
<div><br>
</div>
<div>Thanks in advance, Sebastian</div>
<br>
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