[vtkusers] vtkImageResliceMapper, vtkImageReslice and pixel intensity

[Kenji Tsumura]

Hi,

I have 3D MRI dataset and I resliced the data using vtkImageResliceMapper.
I find it difficult to figure out why the pixel intensity of resliced images is so different from the original.
In the attached file, the resliced image (image on the left) shows the mean value of 21935.5, and the original image (image on the right) shows the mean value of 1447.5.

The following is the excerpt of my java source code.
vtkExtendedImageResliceMapper  extends vtkImageResliceMapper just to return  ImageReslice, as there is no such public method.

---- initialization
        vtkExtendedImageResliceMapper  planeMapper = new vtkExtendedImageResliceMapper();
        planeMapper.SetInputData(imageData);
        planeMapper.SliceFacesCameraOn();
        planeMapper.SliceAtFocalPointOn();
        planeMapper.BorderOff();
        planeMapper.SetSlabTypeToMean();

---- after reslice
        // Get the image re-slice
        vtkImageReslice imageReslice = planeMapper.GetImageReslice();

        // Get the image data
        vtkImageData reslicedImageData = imageReslice.GetOutput();

        // Get the data array
        vtkDataArray dataArray = reslicedImageData.GetPointData().GetScalars();

        // Get the data
        float[] image = null;
        if (dataArray instanceof vtkFloatArray) {
            vtkFloatArray floatArray = (vtkFloatArray) dataArray;
            image = floatArray.GetJavaArray();
        }

My environtment:
VTK 7.0.0
CMake 3.1.1
Visual Studio Professional 2013
Eclipse Luna 4.4.1 (for my java application)

I would appreciate any advice.
Thank you,

Kenji

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