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Occlusion Boundary Detection and Figure/Ground Assignment from Optical Flow



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Occlusion Boundary Detection and Figure Ground Assignment from Optical Flow Patrik Sundberg1 Thomas Brox2 Michael Maire3 Pablo Arbela ez1 and Jitendra Malik1 1 University of California at Berkeley sundberg arbelaez malik eecs berkeley edu 2 3 University of Freiburg Germany brox informatik uni freiburg de California Institute of Technology mmaire caltech edu Abstract 1 our method Sargin et al Stein et al He et al 0 9 In this work we propose a contour and region detector for video data that exploits motion cues and distinguishes occlusion boundaries from internal boundaries based on optical flow This detector outperforms the state of the art on the benchmark of Stein and Hebert 24 improving average precision from 58 to 72 Moreover the optical flow on and near occlusion boundaries allows us to assign a depth ordering to the adjacent regions To evaluate performance on this edge based figure ground labeling task we introduce a new video dataset that we believe will support further research in the field by allowing quantitative comparison of computational models for occlusion boundary detection depth ordering and segmentation in video sequences 0 8 0 7 Precision 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 1 0 2 0 3 0 4 0 5 Recall 0 6 0 7 0 8 0 9 1 Figure 1 Occlusion boundary detection benchmark Precision recall curves for the occlusion boundary detection task reported by Stein and Hebert 24 We show results reported by 24 Sargin et al 21 He et al 14 as well as our own results For performance numbers see Table 1 1 Introduction Vision systems make use of optical flow for a number of purposes such as egomotion estimation and scene structure recovery the latter including both metric depth estimates and ordinal relationships like figure ground In this paper we focus particularly on the role of motion for grouping and figure ground assignments The importance of motion cues in these tasks is a classic point in the psychophysical literature Koffka stated the Gestalt principle of common fate



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