[Insight-users] itkGradientDifferenceImageToImageMetric
Vicente Grau
vicente at robots.ox.ac.uk
Thu Dec 1 11:42:04 EST 2005
Thanks very much, I have already placed a bug report (number 2543). How
can I know when this has been fixed?
Vicente
Lorensen, William E (Research) wrote:
>As you discovered, this filter is badly broken. I've looked at the code this morning and found a few problems already.
>
>As Karthik suggested, you should log a bug for itk at:
>http://www.itk.org/Bug/index.php
>
>Believe it or not, we do look at these.
>
>Bill
>
>
>
>-----Original Message-----
>From: insight-users-bounces+lorensen=crd.ge.com at itk.org
>[mailto:insight-users-bounces+lorensen=crd.ge.com at itk.org]On Behalf Of
>Vicente Grau
>Sent: Wednesday, November 30, 2005 1:07 PM
>To: insight-users at itk.org
>Subject: [Insight-users] itkGradientDifferenceImageToImageMetric
>
>
>I have been comparing several image-to-image metrics using a
>modification of the program MeanSquaresImageMetric1.cxx. With
>GradientDifferenceImageToImageMetric, I get a constant value,
>independent of the translation between the images (e.g., in case of two
>3D images, 40x60x60 voxels, intensity range 0-255, the value is always
>339204.)
>I have only found an example that uses this metric, it is one of the
>tests of itkAlgorithmsTests2.exe. When I run it, I get the result below.
>It seems to me that this result has exactly the same problem: the same
>value 20000 regardless of the translation values (and derivatives equal
>to 0). Is this the expected result for this test? Is the metric working
>well?
>
>------------------------
>Available tests:
>...
>3. itkGradientDifferenceImageToImageMetricTest
>...
>To run a test, enter the test number: 3
>
>Parameters: [-50, -50], Value: 20000, Derivatives: [0, 0]
>Parameters: [-25, -50], Value: 20000, Derivatives: [0, 0]
>Parameters: [0, -50], Value: 20000, Derivatives: [0, 0]
>Parameters: [25, -50], Value: 20000, Derivatives: [0, 0]
>Parameters: [50, -50], Value: 20000, Derivatives: [0, 0]
>Parameters: [-50, -25], Value: 20000, Derivatives: [0, 0]
>Parameters: [-25, -25], Value: 20000, Derivatives: [0, 0]
>Parameters: [0, -25], Value: 20000, Derivatives: [0, 0]
>Parameters: [25, -25], Value: 20000, Derivatives: [0, 0]
>Parameters: [50, -25], Value: 20000, Derivatives: [0, 0]
>Parameters: [-50, 0], Value: 20000, Derivatives: [0, 0]
>Parameters: [-25, 0], Value: 20000, Derivatives: [0, 0]
>Parameters: [0, 0], Value: 20000, Derivatives: [0, 0]
>Parameters: [25, 0], Value: 20000, Derivatives: [0, 0]
>Parameters: [50, 0], Value: 20000, Derivatives: [0, 0]
>Parameters: [-50, 25], Value: 20000, Derivatives: [0, 0]
>Parameters: [-25, 25], Value: 20000, Derivatives: [0, 0]
>Parameters: [0, 25], Value: 20000, Derivatives: [0, 0]
>Parameters: [25, 25], Value: 20000, Derivatives: [0, 0]
>Parameters: [50, 25], Value: 20000, Derivatives: [0, 0]
>Parameters: [-50, 50], Value: 20000, Derivatives: [0, 0]
>Parameters: [-25, 50], Value: 20000, Derivatives: [0, 0]
>Parameters: [0, 50], Value: 20000, Derivatives: [0, 0]
>Parameters: [25, 50], Value: 20000, Derivatives: [0, 0]
>Parameters: [50, 50], Value: 20000, Derivatives: [0, 0]
>GradientDifferenceImageToImageMetric (0198CE00)
> RTTI typeinfo: class itk::GradientDifferenceImageToImageMetric<class
>itk::Image<double,2>,class itk::Image<double,2> >
> Reference Count: 1
> Modified Time: 50
> Debug: Off
> Observers:
> none
> ComputeGradient: 1
> Moving Image: 0198A938
> Fixed Image: 0198CAA0
> Gradient Image: 019C85A0
> Transform: 01987800
> Interpolator: 019C82B0
> FixedImageRegion: ImageRegion (0198CE54)
> Dimension: 2
> Index: [0, 0]
> Size: [100, 100]
>
> Moving Image Mask: 00000000
> Fixed Image Mask: 00000000
> Number of Pixels Counted: 0
>Test passed.
>
>
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