CalibrateDSX: The Importance of Image Smoothing and Downsampling: Difference between revisions

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[[File:CalDSX_KneeEdges.png|600px]]
[[File:CalDSX_KneeEdges.png|600px]]


Smoothed (left), resized(right):
Smoothed 5x5, sigma = 2.0 (left), scaled 0.5 (right):


[[File:CalDSX_KneeSmoothed.png|600px]]
[[File:CalDSX_KneeSmoothed.png|600px]]
[[File:CalDSX_KneeResized.png|600px]]
[[File:CalDSX_KneeResized.png|600px]]


Smoothed and resized:
Smoothed 5x5, sigma = 2.0 and scaled 0.5:


[[File:CalDSX_KneeSmoothedResized.png|600px]]
[[File:CalDSX_KneeSmoothedResized.png|600px]]
'''Example: Cervical Spine'''
These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels.
Original and edge-detected:
[[File:CalDSX_CSpineOriginal.png|600px]]
[[File:CalDSX_CSpineEdges.png|600px]]
Smoothed 5x5, sigma = 2.0 (left), scaled 0.5 (right):
[[File:CalDSX_CSpineSmoothed.png|600px]]
[[File:CalDSX_CSpineResized.png|600px]]
Smoothed 5x5, sigma = 2.0 and scaled 0.5:
[[File:CalDSX_CSpineSmoothedResized.png|600px]]
'''Example: LumbarSpine'''
These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels.
Original and edge-detected:
[[File:CalDSX_LumbarOriginal.png|600px]]
[[File:CalDSX_LumbarEdges.png|600px]]
Smoothed 7x7, sigma = 4.0 (left), scaled 0.33 (right):
[[File:CalDSX_LumbarSmoothed.png|600px]]
[[File:CalDSX_LumbarResized.png|600px]]
Smoothed 7x7, sigma = 4.0 and scaled 0.33:
[[File:CalDSX_LumbarSmoothedResized.png|600px]]

Revision as of 17:41, 19 January 2021

DRR-based tracking of bones in X-ray images relies heavily on the brightness of the bones' edges in the edge-detected images. Smoothing and/or resizing the images during correction increases their signal-to-noise ratio, resulting in brighter edges. Some amount of smoothing or resizing is almost always needed to maximize the trackability of the bones.

Example: Knee

These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels.

Original and edge-detected:

Smoothed 5x5, sigma = 2.0 (left), scaled 0.5 (right):

Smoothed 5x5, sigma = 2.0 and scaled 0.5:

Example: Cervical Spine

These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels.

Original and edge-detected:

Smoothed 5x5, sigma = 2.0 (left), scaled 0.5 (right):

Smoothed 5x5, sigma = 2.0 and scaled 0.5:

Example: LumbarSpine

These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels.

Original and edge-detected:

Smoothed 7x7, sigma = 4.0 (left), scaled 0.33 (right):

Smoothed 7x7, sigma = 4.0 and scaled 0.33:

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