CalibrateDSX: The Importance of Image Smoothing and Downsampling: Difference between revisions
No edit summary |
mNo edit summary |
||
| Line 5: | Line 5: | ||
These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels. | 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 | '''Left:''' Original image | ||
'''Right:''' Edge-detected | |||
[[File:CalDSX_KneeOriginal.png|600px]] | [[File:CalDSX_KneeOriginal.png|600px]] | ||
[[File:CalDSX_KneeEdges.png|600px]] | [[File:CalDSX_KneeEdges.png|600px]] | ||
Smoothed 5x5, sigma = 2.0 ( | '''Left:''' Smoothed (5x5 kernel, sigma = 2.0) | ||
'''Right:''' Resized (scaled by 0.5 to 912x900) | |||
[[File:CalDSX_KneeSmoothed.png|600px]] | [[File:CalDSX_KneeSmoothed.png|600px]] | ||
[[File:CalDSX_KneeResized.png|600px]] | [[File:CalDSX_KneeResized.png|600px]] | ||
Smoothed 5x5, sigma = 2.0 and scaled 0.5 | Smoothed (5x5 kernel, sigma = 2.0) and resized (scaled by 0.5 to 912x900) | ||
[[File:CalDSX_KneeSmoothedResized.png|600px]] | [[File:CalDSX_KneeSmoothedResized.png|600px]] | ||
| Line 23: | Line 25: | ||
These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels. | 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 | '''Left:''' Original image | ||
'''Right:''' Edge-detected | |||
[[File:CalDSX_CSpineOriginal.png|600px]] | [[File:CalDSX_CSpineOriginal.png|600px]] | ||
[[File:CalDSX_CSpineEdges.png|600px]] | [[File:CalDSX_CSpineEdges.png|600px]] | ||
Smoothed 5x5, sigma = 2.0 ( | '''Left:''' Smoothed (5x5 kernel, sigma = 2.0) | ||
'''Right:''' Resized (scaled by 0.5 to 912x900) | |||
[[File:CalDSX_CSpineSmoothed.png|600px]] | [[File:CalDSX_CSpineSmoothed.png|600px]] | ||
[[File:CalDSX_CSpineResized.png|600px]] | [[File:CalDSX_CSpineResized.png|600px]] | ||
Smoothed 5x5, sigma = 2.0 and scaled 0.5 | Smoothed (5x5 kernel, sigma = 2.0) and resized (scaled by 0.5 to 912x900) | ||
[[File:CalDSX_CSpineSmoothedResized.png|600px]] | [[File:CalDSX_CSpineSmoothedResized.png|600px]] | ||
| Line 41: | Line 45: | ||
These images were captured at the Biodynamics Lab at the University of Pittsburgh. They are 14-bit grayscale with a resolution of 1824x1800 pixels. | 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 | '''Left:''' Original image | ||
'''Right:''' Edge-detected | |||
[[File:CalDSX_LumbarOriginal.png|600px]] | [[File:CalDSX_LumbarOriginal.png|600px]] | ||
[[File:CalDSX_LumbarEdges.png|600px]] | [[File:CalDSX_LumbarEdges.png|600px]] | ||
Smoothed 7x7, sigma = 4.0 ( | '''Left:''' Smoothed (7x7 kernel, sigma = 4.0) | ||
'''Right:''' Resized (scaled by 0.33 to 608x600) | |||
[[File:CalDSX_LumbarSmoothed.png|600px]] | [[File:CalDSX_LumbarSmoothed.png|600px]] | ||
[[File:CalDSX_LumbarResized.png|600px]] | [[File:CalDSX_LumbarResized.png|600px]] | ||
Smoothed 7x7, sigma = 4.0 and scaled 0.33 | Smoothed (7x7 kernel, sigma = 4.0) and resized (scaled by 0.33 to 608x600) | ||
[[File:CalDSX_LumbarSmoothedResized.png|600px]] | [[File:CalDSX_LumbarSmoothedResized.png|600px]] | ||
Revision as of 17:50, 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.
Left: Original image Right: Edge-detected
Left: Smoothed (5x5 kernel, sigma = 2.0) Right: Resized (scaled by 0.5 to 912x900)
Smoothed (5x5 kernel, sigma = 2.0) and resized (scaled by 0.5 to 912x900)
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.
Left: Original image Right: Edge-detected
Left: Smoothed (5x5 kernel, sigma = 2.0) Right: Resized (scaled by 0.5 to 912x900)
Smoothed (5x5 kernel, sigma = 2.0) and resized (scaled by 0.5 to 912x900)
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.
Left: Original image Right: Edge-detected
Left: Smoothed (7x7 kernel, sigma = 4.0) Right: Resized (scaled by 0.33 to 608x600)
Smoothed (7x7 kernel, sigma = 4.0) and resized (scaled by 0.33 to 608x600)
