A subpixel algorithm for the reconstruction of kinematics from video sequences in orthostatic postural tests

Author

Schmid, M. ; Conforto, S. ; Giunta, G. ; Alessio, T.D.

Author_Institution

Dept. of Mechanical & Industrial Eng., Rome Univ., Italy

Volume

1

fYear

2003

fDate

17-21 Sept. 2003

Firstpage

821

Abstract

A marker-free method for the reconstruction of kinematics from video sequences during posturographic tests is presented. The image processing algorithm relies on a two-phase motion estimation: a block matching technique, and a fine interpolation that was verified as granting a subpixel resolution. The algorithm was previously evaluated in terms of robustness with respect to SNR, and then applied to the recognition of postural strategies from real sequences during stabilometric trials. The obtained results confirm the validity of the method and thus favours the exploitation of video signal processing for the determination of kinematics in biomechanical tasks.

Keywords

biomechanics; image matching; image reconstruction; image resolution; image segmentation; image sequences; interpolation; medical image processing; video signal processing; SNR; biomechanical tasks; block matching technique; image processing algorithm; interpolation; kinematics; marker-free method; orthostatic postural tests; reconstruction; stabilometric trials; subpixel algorithm; subpixel resolution; two-phase motion estimation; video sequences; video signal processing; Image processing; Image reconstruction; Image resolution; Interpolation; Kinematics; Motion estimation; Signal processing algorithms; Signal resolution; Testing; Video sequences;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE

ISSN

1094-687X

Print_ISBN

0-7803-7789-3

Type

conf

DOI

10.1109/IEMBS.2003.1279891

Filename

1279891