CalibrateDSX: The Importance of Image Smoothing and Downsampling

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.