Introduction 

This page contains software and instructions for generalized time
warping (GTW) [1]. In addition, we provide implementations of the
dynamic time warping (DTW) [2], derivative dynamic time warping (DDTW)
[3], iterative motion warping (IMW) [4] as baselines. in order to
align more than two sequences, we extended DTW, DDTW and IMW to pDTW,
pDDTW and pIMW resepctively by adopting the framework of Procrustes
analysis [5]. Most of the functions have been written and documented
in Matlab format. In order to achieve efficiency, we provided C++
implementations for some functions.

[1] F. Zhou and F. De la Torre, "Generalized Time Warping for
Multi-modal Alignment of Human Motion," in CVPR, 2012.

[2] L. Rabiner and B. Juang, "Fundamentals of speech recognition,"
Prentice Hall, 1993.

[3] E. J. Keogh and M. J. Pazzani, "Derivative Dynamic Time Warping,"
in SDM, 2001.

[4] E. Hsu and K. Pulli and J. Popovic, "Style Translation for Human
Motion," ACM Trans. Graph., vol. 24, pp. 1082-1089, 2005.

[5] I. L. Dryden and K. V. Mardia, "Statistical shape analysis",
Wiley, 1998.

Installation
    1. unzip gtw.zip to your folder;
    2. Run make.m to compile all C++ files;
    3. Run addPath.m to add sub-directories into the path of Matlab.
    4. Run demoToy.m

Instructions
The package of gtw.zip contains following files:
    ./src: This folder contains the main implmentation of GTW and other baseline methods.
    ./lib: This folder contains some necessary library functions.
    ./make.m: Matlab makefile for C++ code.
    ./addPath.m: Adds the sub-directories into the path of Matlab.
    ./demoToy.m: Time alignment of three synthetic sequences by GTW and other baseline method. Same function used for replicating the first experiment in the paper [1].

Copyright
    This software is free for use in research projects. If you
    publish results obtained using this software, please use this
    citation.
@inproceedings{ZhouD12,
   author	= {Feng Zhou and Fernando {De la Torre}},
   title 	= {Generalized Time Warping for Alignment of Human Motion},
   booktitle	= {CVPR},
   year 	= {2012},
}
If you have any question, please feel free to contact Feng Zhou (zhfe99@gmail.com).