TY - GEN
T1 - Optical flow back-projection for genuine motion vector estimation
AU - Huang, Chieh Ling
AU - Chen, E. Liang
AU - Chung, Pau Choo
AU - Choo, Yuh Ren
PY - 2004/12/1
Y1 - 2004/12/1
N2 - Motion vector plays one significant feature in MPEG-4 video object segmentation. However, the motion vector in this application is required to represent the actual motion displacement, rather than regions of visually significant similarity. In this paper, Optical Flow Back-projection (OFB) which back-projects optical flows in a cluster to restore the region's motion vector from gradient-based optical flows, is proposed to obtain genuine motion displacement. The back-projection is performed based on minimizing the projection mean square errors of the motion vector on gradient directions. As Optical flows of various magnitudes and directions provide various degrees of reliability in the genuine motion restoration, the optical flows to be used in the OFB are selected based on high gradient. With this approach, the interference by similar blocks, which frequently results in irrational motion displacement in traditional block matching approach, can be avoided and more reliable motion vectors can be obtained.
AB - Motion vector plays one significant feature in MPEG-4 video object segmentation. However, the motion vector in this application is required to represent the actual motion displacement, rather than regions of visually significant similarity. In this paper, Optical Flow Back-projection (OFB) which back-projects optical flows in a cluster to restore the region's motion vector from gradient-based optical flows, is proposed to obtain genuine motion displacement. The back-projection is performed based on minimizing the projection mean square errors of the motion vector on gradient directions. As Optical flows of various magnitudes and directions provide various degrees of reliability in the genuine motion restoration, the optical flows to be used in the OFB are selected based on high gradient. With this approach, the interference by similar blocks, which frequently results in irrational motion displacement in traditional block matching approach, can be avoided and more reliable motion vectors can be obtained.
UR - http://www.scopus.com/inward/record.url?scp=11244292049&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11244292049&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:11244292049
SN - 0780386035
SN - 9780780386037
T3 - 2004 IEEE International Conference on Multimedia and Expo (ICME)
SP - 523
EP - 526
BT - 2004 IEEE International Conference on Multimedia and Expo (ICME)
T2 - 2004 IEEE International Conference on Multimedia and Expo (ICME)
Y2 - 27 June 2004 through 30 June 2004
ER -