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Sea Ice non-rigid motion and discontinuity estimation from satellite images

Sea Ice non-rigid motion and discontinuity estimation from satellite images. ACE Meeting May 9 th 2012. Dr. Cathleen Geiger Department of Geography. Gowri Somanath Vincent Ly Dr. Chandra Kambhamettu Department of Computer & Information Sciences. http://vims.cis.udel.edu. Today.

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Sea Ice non-rigid motion and discontinuity estimation from satellite images

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  1. Sea Ice non-rigid motion and discontinuity estimation from satellite images ACE Meeting May 9th 2012 Dr. Cathleen Geiger Department of Geography GowriSomanath Vincent Ly Dr. Chandra Kambhamettu Department of Computer & Information Sciences http://vims.cis.udel.edu

  2. Today • Look at some results from motion segmentation and summary presentation • High activity, low activity • Thresholds and its effect on level of summary • Possible further analysis • Next steps

  3. Motion summary: visualizing flow characteristics using motion in an area Its hard to look at the dense motion vectors, so we present a ‘summary’ by segmenting the motion field into coherent regions with ‘similar motion’. • The segments are demarcated by the thick black lines. The transparent grayscale color is only an indication of segments not anything else from the image. • The arrows show the direction of motion (length and thickness scaled by motion magnitude). It is calculated from the average of all vectors within the segment. • The white dot is placed at the centroid of the corresponding segment. • The blue line is along the horizontal axis – which is the reference for all angular measurements. • The green semi-circle indicates the lower and upper bounds on the angular component of the motion in the segment. The bounds are determined by mean and standard deviation of the angle of the motion (we use mean+std dev and mean-std dev). The start and end points of the green semi-circle indicate these limits.

  4. Motion ‘summary’ : set 1 LIC Summary image Motion magnitude

  5. Motion ‘summary’ : set 2 LIC Summary image Motion magnitude

  6. Motion ‘summary’ : set 4c LIC Summary image Motion magnitude

  7. Motion ‘summary’ : set 5 LIC Summary image Motion magnitude

  8. Motion ‘summary’ : set 1 – parameter tweaks LIC Motion magnitude

  9. Possible analysis • Fix a threshold and study the ‘summary’ over a area from multiple pairs (over time) • Do more segments mean more breakage? • Changes in patterns of motion – indicate something interesting? Need • Data to perform the above tests Questions and suggestion?

  10. Next step • We need to revamp our GUI design to accommodate some of our newer products and ideas • We may do more tests on the segmentation with existing data.

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