# Using getImageCropped function in PyAutoscoper. Getting truncated/empty data

**URL:** <https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471>\
**Category:** SlicerAutoscoperM\
**Created:** [March 16, 2026, 7:09pm UTC](https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471 "2026-03-16T19:09:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Prabhroop\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/prabhroop_singh/32/80603_2.png) [@Prabhroop\_Singh](https://discourse.slicer.org/u/Prabhroop_Singh)\
**Post date:** [March 16, 2026, 7:09pm UTC](https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471/1 "2026-03-16T19:09:42Z")

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I’m trying to use getImageCropped from PyAutoscoper to extract the cropped DRR image of a volume at a given pose. My setup works fine otherwise – getPose, getNCC, optimizeFrame, and trackingDialog all work correctly. This is the output i am getting:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/9/990caf8c94bc1592e79fccaeaf6ab7c8f8db1634.png)

The width and height (1760x1760) look correct, but the byte array is only 1015 bytes long and entirely zeros. For a 1760x1760 image I’d expect significantly more data.

1. What is getImageCropped supposed to return exactly? The docstring says list[float] but it actually returns [width, height, raw\_bytes]. What format/dtype is the image data (float32, uint8, RGB, grayscale)?
2. Is there another recommended way to programmatically extract DRR or radiograph images from Autoscoper?

Thanks for the help!

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**Author:** ![John\_Holtgrewe](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@John\_Holtgrewe](https://discourse.slicer.org/u/John_Holtgrewe)\
**Post date:** [March 18, 2026, 6:42pm UTC](https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471/2 "2026-03-18T18:42:22Z")

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Hi Prabhroop,

My experience with using socket controls for SlicerAutoscoper has been limited to Matlab. I don’t believe there is an equivalent function, so I can’t answer your questions presently. However, this is something I can look into and get back to you on.

Thank you,

John

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**Author:** ![Prabhroop\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/prabhroop_singh/32/80603_2.png) [@Prabhroop\_Singh](https://discourse.slicer.org/u/Prabhroop_Singh)\
**Post date:** [March 30, 2026, 11:38pm UTC](https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471/3 "2026-03-30T23:38:55Z")

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Hi John,

Just following up on this, any updates on the socket controls on the Python side?

Thanks,

Prabhroop

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**Author:** ![John\_Holtgrewe](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@John\_Holtgrewe](https://discourse.slicer.org/u/John_Holtgrewe)\
**Post date:** [April 3, 2026, 7:28pm UTC](https://discourse.slicer.org/t/using-getimagecropped-function-in-pyautoscoper-getting-truncated-empty-data/46471/4 "2026-04-03T19:28:21Z")

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Hi Prabhroop,

I did test the Python socket controls, and got the same results that you did. Troubleshooting this is beyond my expertise, so I have elevated this issue. There was a similar function in the documentation for the Matlab socket controls; however, this function was never fully implemented. It is possible that the Python socket function and other socket controls were not fully implemented.

Thank you,

John