DocumentCode
1383779
Title
Filtering requirements for gradient-based optical flow measurement
Author
Christmas, W.J.
Author_Institution
Centre for Vision, Speech, & Signal Process., Surrey Univ., Guildford, UK
Volume
9
Issue
10
fYear
2000
fDate
10/1/2000 12:00:00 AM
Firstpage
1817
Lastpage
1820
Abstract
The accuracy of gradient-based optical flow algorithms depends on the ability to measure intensity gradients accurately. We show how the temporal gradient can be compromised by temporal aliasing arising from motion and how appropriate post-sampling spatial filtering improves the situation. We also demonstrate a benefit of using higher-order gradient estimators
Keywords
antialiasing; gradient methods; image sampling; image sequences; motion estimation; spatial filters; filtering requirements; gradient-based optical flow measurement; higher-order gradient estimators; intensity gradients; post-sampling spatial filtering; temporal aliasing; temporal gradient; Filtering; Fluid flow measurement; Fourier transforms; Frequency estimation; Gradient methods; Image motion analysis; Image sampling; Motion measurement; Optical filters; Spatial filters;
fLanguage
English
Journal_Title
Image Processing, IEEE Transactions on
Publisher
ieee
ISSN
1057-7149
Type
jour
DOI
10.1109/83.869192
Filename
869192
Link To Document