[Insight-users] exception when writing row or column images

[Zachary Pincus]

Luis,

In general, I have no specific need for one-column images sine in my 
case (as, I assume, in most others) they represent erroneous algorithm 
output.

I was just wondering if this was a feature or a bug. Given that it is a 
feature, a programmatic flag to control it (and the associated 
documentation about both the feature and flag) would be nice, but 
certainly a very-low-priority item, since I certainly have no specific 
need for row- or column-images.

Thanks for your reply, and really for all the time you spend on the 
email list,

Zach Pincus

On Apr 19, 2004, at 11:27 AM, Luis Ibanez wrote:

>
> Hi Zach,
>
> This is a safeguard that was introduced on purpose
> in order to prevent the missuse of the writers.
>
> If you are sure that you want to save 1-row images,
> you can simply override this control.
>
>
> For this, just go to:
>
>           Insight/Code/IO/
>                    itkJPEGImageIO.cxx
>
>
> move to line 457 and comment out the three lines:
>
>
>   // Make sure the region to be written is 2D
>   if ( ioRegion.GetRegionDimension() != 2 )
>     {
>     itkExceptionMacro(<<"JPEG Writer can only
>             write 2-dimensional images");
>     }
>
>
>
> What happens is that the method: GetRegionDimension()
> considers that an image should have more than one pixel
> along every dimension. Therefore, dimensions that are
> just one pixel wide, are assumed to be flattened.
>
>
> We could probably set a flag on the file
>
>                itkImageIORegion.h
>
> in order to change the limit from "1" to "0".
>
> In this way, images of one pixel along a dimension
> will not considered to be of inferior dimension.
>
>
> Please let us know if this works for you,
> and whether you will find useful to have such
> a flag available or not.
>
>
>    Thanks,
>
>
>      Luis
>
>
> ----------------------
> Zachary Pincus wrote:
>
>> Hello,
>> A tool that I'm building sometimes segments out an object that is it  
>> the far edge of an image, leading me to try to save to disk an image  
>> that, while 2D by type, consists of a single row or column. (i.e. 
>> that  has a degenerate second dimension.)
>> Unfortunately, this does not appear to be possible, and instead  
>> generates the exception:
>>> itk::ERROR: JPEGImageIO(0x2101070): JPEG Writer can only write  
>>> 2-dimensional images
>> (the same general error appears regardless of which ImageIO you 
>> choose.)
>> I'm sure that 1 x n or n x 1 images are valid in most if not all 
>> image  format specifications.
>> Is this a bug? And if it's been brought up before, I apologize -- I  
>> didn't find anything on the mailing list archive.
>> Thanks,
>> Zach Pincus
>> Department of Biochemistry and Program in Biomedical Informatics
>> Stanford University School of Medicine
>> Here is code to reproduce this error:
>> #include "itkImageFileWriter.h"
>> #include "itkImage.h"
>> #include <iostream>
>> const unsigned int Dimension = 2;
>> typedef unsigned short PixelType;
>> typedef itk::Image<PixelType, Dimension>  ImageType;
>> typedef itk::ImageFileWriter<ImageType> WriterType;
>> int main(int argc, char *argv[]) {
>>     ImageType::Pointer image = ImageType::New();
>>         ImageType::IndexType start;
>>     start[0] =   0;
>>     start[1] =   0;
>>         ImageType::SizeType  size;
>>     size[0]  = 2;
>>     size[1]  = 1;
>>     ImageType::RegionType region;
>>     region.SetSize( size );
>>     region.SetIndex( start );
>>     image->SetRegions( region );
>>     image->Allocate();
>>     std::cout << image << std::endl;
>>         WriterType::Pointer writer = WriterType::New();
>>     writer->SetFileName("foo.jpg");
>>     writer->SetInput(image);
>>         try {
>>     writer->Update();
>>     } catch( itk::ExceptionObject & err ) {
>>         std::cout << "ExceptionObject caught !" << std::endl;
>>         std::cout << err << std::endl;
>>         return -1;
>>     }
>>     return 0;
>> }
>> Running this code results in this:
>> Image (0x2100420)
>>   RTTI typeinfo:   N3itk5ImageItLj2EEE
>>   Reference Count: 2
>>   Modified Time: 4
>>   Debug: Off
>>   Observers:
>>     none
>>   Source: (none)
>>   Source output index:  0
>>   Release Data: Off
>>   Data Released: False
>>   Global Release Data: Off
>>   PipelineMTime: 0
>>   UpdateMTime: 0
>>   LargestPossibleRegion:
>>     Dimension: 2
>>     Index: [0, 0]
>>     Size: [2, 1]
>>   BufferedRegion:
>>     Dimension: 2
>>     Index: [0, 0]
>>     Size: [2, 1]
>>   RequestedRegion:
>>     Dimension: 2
>>     Index: [0, 0]
>>     Size: [2, 1]
>>   Spacing: [1, 1]
>>   Origin: [0, 0]
>>   PixelContainer: ImportImageContainer (0x21004f0)
>>   RTTI typeinfo:   N3itk20ImportImageContainerImtEE
>>   Reference Count: 2
>>   Modified Time: 5
>>   Debug: Off
>>   Observers:
>>     none
>>   Pointer: 0x2100534
>>   Container manages memory: true
>>   Size: 2
>>   Capacity: 2
>> ExceptionObject caught !
>> itk::ExceptionObject (0x2101020)
>> Location: "Unknown"
>> File:  /Volumes/Atlotl/Developer/ITK/ITK-CVS-src/Insight/Code/IO/ 
>> itkJPEGImageIO.cxx
>> Line: 459
>> Description: itk::ERROR: JPEGImageIO(0x2101070): JPEG Writer can only 
>>  write 2-dimensional images
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>
>
>