Title :
Approximating optical flow within the MPEG-2 compressed domain
Author :
Coimbra, M.T. ; Davies, M.
Author_Institution :
Dept. of Electron. Eng., Queen Mary Univ. of London, UK
Abstract :
MPEG-2 compressed domain information, namely motion vectors and DCT coefficients, is filtered and manipulated to obtain a motion field using a two-dimensional (2-D) translational model. The results are compared to a popular optical flow method, more specifically the one presented by Lucas and Kanade (1981), revealing very good results. Our method provides a very fast motion estimation tool that can be useful for applications where algorithmic cost is critical, such as surveillance systems. All methods are theoretically explained and their efficiency confirmed on real-world data.
Keywords :
data compression; discrete cosine transforms; image sequences; motion estimation; transform coding; video coding; 2D translational model; MPEG-2 compressed domain; discrete cosine transform coefficient; motion estimation; motion field; motion vector; optical flow method; Costs; Discrete cosine transforms; Image motion analysis; Information filtering; Information filters; Motion estimation; Optical filters; Surveillance; Transform coding; Two dimensional displays; Compressed domain information; motion estimation; motion vectors; optical flow;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
DOI :
10.1109/TCSVT.2004.837016
