Learning spatiotemporal T-junctions for occlusion detection

  • Apostoloff N
  • Fitzgibbon A
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The goal of motion segmentation and layer extraction can be viewed as the detection and localization of occluding surfaces. A feature that has been shown to be a particularly strong indicator of occlusion, in both computer vision and neuroscience, is the T-junction; however, little progress has been made in T-junction detection. One reason for this is the difficulty in distinguishing false T-junctions (i.e. those not on an occluding edge) and real T-junctions in cluttered images. In addition to this, their photometric profile alone is not enough for reliable detection. This paper overcomes the first problem by searching for T-junctions not in space, but in space-time. This removes many false T-junctions and creates a simpler image struc- ture to explore. The second problem is mitigated by learn- ing the appearance of T-junctions in these spatiotemporal images. An RVM T-junction classifier is learnt from hand- labelled data using SIFT to capture its redundancy. This detector is then demonstrated in a novel occlusion detector that fuses Canny edges and T-junctions in the spatiotempo- ral domain to detect occluding edges in the spatial domain.

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  • Nicholas Apostoloff

  • Andrew Fitzgibbon

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