The Robotics Institute

Carnegie Mellon Robotics Institute

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Abstract

While great strides have been made in detecting and localizing specific objects in natural images, the bottom-up segmentation of unknown, generic objects remains a difficult challenge. We believe that occlusion can provide a strong cue for object segmentation and "pop-out", but detecting an object's occlusion boundaries using appearance alone is a difficult problem in itself. If the camera or the scene is moving, however, that motion provides an additional powerful indicator of occlusion. Thus, we use standard appearance cues (e.g. brightness/color gradient) in addition to motion cues that capture subtle differences in the relative surface motion (i.e. parallax) on either side of an occlusion boundary. We describe a learned local classifier and global inference approach which provide a framework for combining and reasoning about these appearance and motion cues to estimate which region boundaries of an initial over-segmentation correspond to object/occlusion boundaries in the scene. Through results on a dataset which contains short videos with labeled boundaries, we demonstrate the effectiveness of motion cues for this task.

Notes

Associated Center(s) / Consortia: Vision and Autonomous Systems Center

Number of pages: 8

Note: Dataset available from http://www.cs.cmu.edu/~stein/occlusion_data

Text Reference

Andrew Stein, Derek Hoiem, and Martial Hebert, "Learning to Find Object Boundaries Using Motion Cues," IEEE International Conference on Computer Vision (ICCV), October, 2007.

BibTeX Reference

@inproceedings{Stein_2007_5836,
   author = "Andrew Stein and Derek Hoiem and Martial Hebert",
   title = "Learning to Find Object Boundaries Using Motion Cues",
   booktitle = "IEEE International Conference on Computer Vision (ICCV)",
   month = "October",
   year = "2007",
   Notes = "Dataset available from http://www.cs.cmu.edu/~stein/occlusion_data"
}

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