[vtkusers] Image correlation

[Jérôme]

Hi David,

When I change the type of the scalar data -eg. from double to uchar for
writing jpeg-, I rather use vtkImageShiftScale. You can set a primary shift
(eg. set min to zero) and then scale (eg. set max to 255). I think it has
been designed especially for that because it includes a cast-like behaviour:
SetOutputScalarTypeToXxxx.

I printed the correlation output scalar range and noted that max =
5.202e+06. I fixed the pipeline and changed the wiki accordingly.

Jerome

2010/2/7 David Doria <daviddoria+vtk at gmail.com <daviddoria%2Bvtk at gmail.com>>

> I am trying to adapt the tcl vtkImageCorrelate test into an example. The
> documentation says that the output of vtkImageCorrelate will be double
> values (I am expecting between -1 and 1 (or 0 and 1)?). To view an image of
> the correlation values, I turn these double values into an unsigned char
> image (I used vtkImageMathematics to multiply by 255).
>
> The complete example is here:
> http://www.vtk.org/Wiki/VTK/Examples/Images/ImageCorrelation
>
> The problem is that the output (correlation.jpg) is blank. Anyone see any
> reason why this would be the case?
>
> Thanks,
>
> David
>
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