# vtkFlyingEdges2D generates scaled contours
**URL:** https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766
**Category:** Support
**Created:** [June 21, 2022, 3:23am UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766 "2022-06-21T03:23:39Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@xxyyy159](https://discourse.vtk.org/u/xxyyy159)
#### Post date: [June 21, 2022, 3:23am UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766/1 "2022-06-21T03:23:39Z")
Hi all,
I’m implementing vtkFlyingEdges2D to a CT image to generate a contour of the bone. But the output of vtkFlyingEdges2D has been scaled to a level of 1.2x.
I post the result below.
bounds of contour \>\> 69.9951 69.9951 79.7139 253.098 0 1238.49
bounds of ct image \>\> 81.6406 81.6406 0 417.184 0 1061.83
If you know how to solve this problem, please let me know.
Thanks.
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### Author:  [@xxyyy159](https://discourse.vtk.org/u/xxyyy159)
#### Post date: [June 21, 2022, 3:58am UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766/2 "2022-06-21T03:58:48Z")
If I set the sliceOrientaionToXY, the contour scale is fine.
But the others slice orientation will generate different scale contours like before.
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### Author:  [@mau\_igna\_06](https://discourse.vtk.org/u/mau_igna_06)
#### Post date: [June 21, 2022, 9:11pm UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766/3 "2022-06-21T21:11:19Z")
This is probably because the image is unisotropic. I think you’ll need to apply a matrix an somekind of scaling factor.
I’d read about how Slicer does this for threshold segment editor effect if I were you
Hope it helps
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### Author:  [@xxyyy159](https://discourse.vtk.org/u/xxyyy159)
#### Post date: [June 22, 2022, 1:23am UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766/4 "2022-06-22T01:23:29Z")
Thank you for your suggestion,I’ll try this later.