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Title: Human posture sequence estimation using two un-calibrated cameras
Authors: Wang, R.
Leow, W.K. 
Issue Date: 2005
Source: Wang, R.,Leow, W.K. (2005). Human posture sequence estimation using two un-calibrated cameras. BMVC 2005 - Proceedings of the British Machine Vision Conference 2005. ScholarBank@NUS Repository.
Abstract: 3D Human posture sequence estimation from single or multiple image sequences is essential in many applications, such as vision-based sport coaching and physical rehabilitation. However, 3D posture sequence cannot be accurately estimated from single image sequence due to depth ambiguity and self-occlusion, and pre-calibration is often required when estimating 3D posture sequence from multiple image sequences. In this paper, we present an algorithm to accurately estimate 3D human posture sequence from two un-calibrated image sequences by combining a modified Nonparametric Belief Propagation (mNBP) method with an improved camera self-calibration method. The mNBP estimates posture even when there is partial self-occlusion and when the human model scale is different from that of body image in image sequences. The improved self-calibration guarantees to find the optimal rotation and relative scale between two fixed but un-calibrated scaled orthographic cameras, without a nonlinear optimization process. Quantitative and qualitative experiment results show that the algorithm is able to estimate 3D posture sequence from a pair of un-calibrated image sequences.
Source Title: BMVC 2005 - Proceedings of the British Machine Vision Conference 2005
DOI: 10.5244/C.19.46
Appears in Collections:Staff Publications

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