Shape Change Along Geodesics with Application to Cleft Lip
Surgery
Abstract
Continuous shape change is represented as curves in the shape space. A
method for checking the closeness of these curves to a geodesic is
presented. Three large databases of short human motions are considered
and shown to be well-approximated by geodesics. The motions are thus
approximated by two shapes on the geodesic and the rate of progress
along the path. An analysis of facial motion data taken from a study
of subjects with cleft lip/palate is presented that allows the motion
to be considered independently from the static shape. Inferential
methods for assessing the change in motion are presented. The
construction of predicted animated motions is discussed.
- Some example of animated raw motion capture data: (Whole Head motion
has been removed)
- Subject RR31 performs a maximal smile
before surgery and another after
surgery
- Averaging motions:
- The mean smiles over all cleft
revision subjects before and after surgery. Motion has been adjusted
to start from the same mean initial shape.
We also provide a subset of the data
that is described in the paper. The first two columns in the data
provide the index and time of the frame. The remaining 38*3 columns
give the coordinates of the markers in the order indicated in the
header. The seperator is a tab and missing values are denoted by a
null entry.
Further examples of motion can be found in a related paper:
Effects of Lip Revision Surgery in Patients with Cleft Lip & Palate
Last modified: Fri Feb 19 12:18:40 GMT 2010