[Insight-users] extract slice from RGB image

[john smith]

You may have right as it should work properly.It is the first time I am
working with RGB images. But what changes should be done?

Thanks for yoyr response

2011/6/30 robert tamburo <robert.tamburo at gmail.com>

> Do you really expect the filter to extract a 2D image of unsigned char
> pixels from a 3D image of RGB pixels?
>
> On Thu, Jun 30, 2011 at 3:07 PM, john smith <mkitkinsightuser at gmail.com>wrote:
>
>> Hello to all,
>>
>> I am trying to read an RGB image, then use the ExtractImageFilter and
>> finally, write the RGB slice. I have written the following code, but I get
>> this error
>> *error C2440: 'static_cast' : cannot convert from
>> 'itk::RGBPixel<TComponent>' to 'unsigned char' *. Do you know what I am
>> doing wrong?
>>
>> Thanks in advance
>>
>> ///////// code //////////////
>> typedef itk::RGBPixel<unsigned char> RGBPixelType;
>>   typedef itk::Image<RGBPixelType,3> RGBImageType;
>>
>>    typedef  itk::ImageFileReader< RGBImageType > ReaderType_RGB;
>>
>>      ReaderType_RGB::Pointer reader_RGB = ReaderType_RGB::New();
>>
>>      reader_RGB->SetFileName( "output.hdr"  );
>>      reader_RGB->Update();
>>
>>
>>   typedef unsigned char       OutputPixelType_extract_RGB;
>>   typedef itk::Image< OutputPixelType_extract_RGB, 2 >
>> OutputImageType_extract_RGB;
>>    typedef itk::ExtractImageFilter< RGBImageType,
>> OutputImageType_extract_RGB > FilterType_extract_RGB;
>>     FilterType_extract_RGB::Pointer filter_extract_RGB =
>> FilterType_extract_RGB::New();
>>
>>   RGBImageType::RegionType inputRegion =
>>           reader_RGB->GetOutput()->GetLargestPossibleRegion();
>>
>>
>>   RGBImageType::SizeType size = inputRegion.GetSize();
>>
>>   // get the size of the hole 3D image
>>   size_x = size[0];
>>   size_y = size[1];
>>    size_z = size[2];
>>
>>   // get slices of z coordiante
>>   size[2] = 0;
>>
>>    RGBImageType::IndexType start = inputRegion.GetIndex();
>>   ui->verticalScrollBar_z->setRange(0,size_z-1);
>>   unsigned int sliceNumber = ui->verticalScrollBar_z->value();
>>   start[2] = 10;
>>
>>
>>   RGBImageType::RegionType desiredRegion;
>>   desiredRegion.SetSize( size );
>>   desiredRegion.SetIndex( start );
>>
>>   filter_extract_RGB->SetExtractionRegion( desiredRegion );
>>
>>     typedef  itk::ImageFileWriter< OutputImageType_extract_RGB  >
>> WriterType_RGB;
>>      WriterType_RGB::Pointer writer_RGB = WriterType_RGB::New();
>>     writer_RGB->SetFileName( "z.png" );
>>
>>    filter_extract_RGB->SetInput( reader_RGB->GetOutput() );
>>    writer_RGB->SetInput( filter_extract_RGB->GetOutput() );
>>
>>     try
>>     {
>>     writer_RGB->Update();
>>     }
>>   catch( itk::ExceptionObject & err )
>>     {
>>     std::cerr << "ExceptionObject caught !" << std::endl;
>>     std::cerr << err << std::endl;
>>     }
>>
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