### Summary
This paper introduces registration curves as a method for resolving problems in motion blending.
### Problem
Simple linear blending will not produce reasonable results on many classes of actions unless the motions to be blended are very carefully chosen and possibly preprocessed by hand
### Methods Used
To construct the registration curve

*  Construct a timewarp curve to synch the two motions to be blended
*  Construct an alignment curve to match the two motions spatially
*  Construct a set of constraint matches, a set of frames in which the new, blended motion is to satisfy the constraints of the input motions

To blend using the curve

*  Determine the position in time of each of the input motions using the timewarp curve
*  Position and orient the motions using the alignment curve
*  Combine the frames using their blending weights
*  Constrain the resultant blend according to the constraint match set

### Key Ideas
This paper introduces registration curves as a method of automatically blending similar motions by the above method.