[Insight-users] need help in using itkLabelOverlayImageFilter

[john smith]

Thanks for your response. I know that there are these two errors but, do you
know what must be done in order to fix this errors?

2011/6/29 robert tamburo <robert.tamburo at gmail.com>

> Source of errors:
>
> *  labelOverlayFilter->SetInput(reader1);
>   labelOverlayFilter->**SetLabelImage("result.png");*
> *
> *
> On Wed, Jun 29, 2011 at 1:11 PM, john smith <mkitkinsightuser at gmail.com>wrote:
>
>> Hello,
>>
>> I am trying to use itkLabelOverlayImageFilter. My initial image (which I
>> segment) is a greyscale image (with values 0-255) and I load it using a
>> dialog box of Qt, as it seems
>>
>> *  typedef   float           InternalPixelType;
>>   const     unsigned int    Dimension = 2;
>>   typedef itk::Image< InternalPixelType, Dimension >  InternalImageType;
>>   typedef  itk::ImageFileReader< InternalImageType > ReaderType;
>>   ReaderType::Pointer reader1 = ReaderType::New();
>>   reader1->SetFileName(fileName.toStdString());*
>>
>> The result of my segmentation is a binary image , which is been saved wih
>> name "result.png", and I use a reader to read this file:
>>
>> *ReaderType::Pointer reader2 = ReaderType::New();
>>   reader2->SetFileName("result.png");*
>>
>> I want to ask how I could use itkLabelOverlayImageFilter and what changes
>> I should make in order to work properly. Any example whould be very useful ,
>> as I am confused with the image type casting.
>>
>> I have tried something like this, But I got errors:
>>
>> *   typedef itk::RGBPixel<unsigned char> RGBPixelType;
>>   typedef itk::Image<RGBPixelType> RGBImageType;
>>
>>  typedef itk::LabelOverlayImageFilter<OutputImageType, OutputImageType,
>> RGBImageType> LabelOverlayFilterType;
>>   LabelOverlayFilterType::Pointer labelOverlayFilter =
>> LabelOverlayFilterType::New();
>>   labelOverlayFilter->SetInput(reader1);
>>   labelOverlayFilter->SetLabelImage("result.png");
>>   labelOverlayFilter->SetOpacity(1.0);
>>   labelOverlayFilter->ResetColors(); // reset color map
>>   labelOverlayFilter->AddColor(0, 0, 255); // fill color map with blue
>>   labelOverlayFilter->SetBackgroundValue(0); // don't overlay the
>> background, i.e., label 0
>>   labelOverlayFilter->Update();*
>>
>> Thanks in advance
>>
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