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Unexpectedly large mass in Moments of Inertia #33

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rimadoma opened this issue Apr 25, 2016 · 1 comment
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Unexpectedly large mass in Moments of Inertia #33

rimadoma opened this issue Apr 25, 2016 · 1 comment

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@rimadoma
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An uncalibrated image produces weird results when run through _Moments of Inertia: "mass" becomes unexpectedly large.

Steps to reproduce
  1. Open bone sample image (File > Open Samples > Bat Cochlea Volume)
  2. Run Moments of Inertia (Plugins > BoneJ > Moments of Inertia)
  3. Press OK on the Setup dialog
  4. "Mass" column shows "173970 g"
@rimadoma rimadoma mentioned this issue Apr 25, 2016
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mdoube added a commit to mdoube/BoneJ that referenced this issue Aug 6, 2018
@mdoube
Moments: assume uncalibrated images have 1mm pixel spacing
e8136c9 
Includes a message in the dialog if the image lacks spatial calibration.

Fixes bonej-org/bonej#33
@mdoube
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mdoube commented Aug 6, 2018

There isn't an obvious way to deal with this. The problem is that the code operates as though you have 1cm / pixel, which is not very intuitive. It makes more sense for most of our images to assume 1 mm pixel spacing. Fixed by mdoube/BoneJ@e8136c9

@mdoube mdoube closed this as completed Aug 6, 2018
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@mdoube @rimadoma