Effective Volumetric Feature Modeling and Coarse Correspondence via Improved 3DSIFT and Spectral Matching

Figure 1

The four-step pipeline of I3DSIFT. (a) A small amount of the detected keypoints is illustrated. (b) The orientation of a pixel is computed. (c) A keypoint’s surrounding region is reoriented according to its dominant direction . (d) 3DSIFT descriptor construction. Note that we draw fixed size regions in (c) and (d) for convenient visualization while both steps actually use scale-related region in I3DSIFT.

(a) Keypoint detection

(b) Orientation assignment

(c) Direction reorientation

(d) Descriptor construction