[Insight-users] derivativeImageFilter

[robert tamburo]

Looks like concept checking for DerivativeImageFilter. The output image type
likely needs to be signed.

On Wed, Mar 16, 2011 at 1:59 PM, john smith <mkitkinsightuser at gmail.com>wrote:

> and here is my code (if this could help you):
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>
>
> #include "itkImage.h"
> #include "itkImageFileReader.h"
> #include "itkImageFileWriter.h"
> #include "itkDerivativeImageFilter.h"
>
>
>
> int main(int argc, char * argv[])
> {
>   // Verify command line arguments
>   if( argc < 2 )
>     {
>     std::cerr << "Usage: " << std::endl;
>     std::cerr << argv[0] << " inputImageFile" << std::endl;
>     return EXIT_FAILURE;
>     }
>
>   // Parse command line arguments
>   std::string inputFilename = argv[1];
>
>   // Setup types
>  // typedef itk::Image< float,  2 >        FloatImageType;
>   typedef itk::Image< unsigned char, 2 > ImageType;
>
>   typedef itk::ImageFileReader< ImageType >  readerType;
>   typedef itk::ImageFileWriter< ImageType >  writerType;
>
>   typedef itk::DerivativeImageFilter<
>           ImageType, ImageType >  filterType;
>
>
>   // Create and setup a reader
>   readerType::Pointer reader = readerType::New();
>   reader->SetFileName( inputFilename.c_str() );
>
>   // Create and setup a derivative filter
>   filterType::Pointer derivativeFilter = filterType::New();
>   derivativeFilter->SetInput( reader->GetOutput() );
>   derivativeFilter->SetDirection(0); // "x" axis
>
>
>   writerType::Pointer writer = writerType::New();
>   writer->SetFileName("result.png");
>   writer->SetInput(derivativeFilter->GetOutput());
>
>       try
>     {
>     writer->Update();
>     }
>     catch( itk::ExceptionObject exp )
>     {
>     std::cerr << "Exception caught !" << std::endl;
>     std::cerr << exp << std::endl;
>     }
>
>   return EXIT_SUCCESS;
> }
>
> 2011/3/16 john smith <mkitkinsightuser at gmail.com>
>
>> Hi,
>>
>> I made thechanges and  when I run it from the command line window I get a
>> message which is says that png supports unsigned char and unsigned short.
>> But when I make these changes I get failures in the building of the project:
>> *error C2440: 'initializing' : cannot convert from
>> 'itk::Concept::Detail::UniqueType_bool<__formal>' to
>> 'itk::Concept::Detail::UniqueType_bool<__formal>'. *Could somebody help
>> me with this?
>>
>> Thanks in advance
>>
>>
>>
>> 2011/3/15 robert tamburo <robert.tamburo at gmail.com>
>>
>>> Take a look at your writerType typedef.
>>>
>>>
>>> On Tue, Mar 15, 2011 at 9:49 AM, john smith <mkitkinsightuser at gmail.com>wrote:
>>>
>>>> Hi to everyone,
>>>>
>>>> I want to read an image and use a derivative image filter.I wrote the
>>>> following code, but when I get a failure because I thonk that the types of
>>>> reader,writer and derivative image filter do not match each other.Could
>>>> somebody help me?
>>>>
>>>> Thanks in advance
>>>>
>>>> ================DerivativeImageFilter.cxx==========================
>>>> #include "itkImage.h"
>>>> #include "itkImageFileReader.h"
>>>> #include "itkImageFileWriter.h"
>>>> #include "itkDerivativeImageFilter.h"
>>>>
>>>>
>>>>
>>>> int main(int argc, char * argv[])
>>>> {
>>>>   // Verify command line arguments
>>>>   if( argc < 2 )
>>>>     {
>>>>     std::cerr << "Usage: " << std::endl;
>>>>     std::cerr << argv[0] << " inputImageFile" << std::endl;
>>>>     return EXIT_FAILURE;
>>>>     }
>>>>
>>>>   // Parse command line arguments
>>>>   std::string inputFilename = argv[1];
>>>>
>>>>   // Setup types
>>>>   typedef itk::Image< float,  2 >        FloatImageType;
>>>>   typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;
>>>>
>>>>   typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
>>>>   typedef itk::ImageFileReader< UnsignedCharImageType >  writerType;
>>>>
>>>>   typedef itk::DerivativeImageFilter<
>>>>           UnsignedCharImageType, FloatImageType >  filterType;
>>>>
>>>>   // Create and setup a reader
>>>>   readerType::Pointer reader = readerType::New();
>>>>   reader->SetFileName( inputFilename.c_str() );
>>>>
>>>>   // Create and setup a derivative filter
>>>>   filterType::Pointer derivativeFilter = filterType::New();
>>>>   derivativeFilter->SetInput( reader->GetOutput() );
>>>>   derivativeFilter->SetDirection(0); // "x" axis
>>>>
>>>>    typedef  itk::ImageFileWriter< writerType  > WriterType;
>>>>   WriterType::Pointer writer = WriterType::New();
>>>>   writer->SetFileName("result.png");
>>>>   writer->SetInput(derivativeFilter->GetOutput());
>>>>
>>>>       try
>>>>     {
>>>>     writer->Update();
>>>>     }
>>>>     catch( itk::ExceptionObject exp )
>>>>     {
>>>>     std::cerr << "Exception caught !" << std::endl;
>>>>     std::cerr << exp << std::endl;
>>>>     }
>>>>
>>>>   return EXIT_SUCCESS;
>>>> }
>>>>
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>>>
>>
>
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