Color Tracking Motion Detection

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Color Tracking Motion Detection

• CIS 750 Final Project
• Advisor Professor Latecki
• Presentation X. Wen

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Agenda

• Introduction
• Algorithm
• Experiments
• Conclusion

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Introduction

• We make the bins histogram first, and then use it
  to track the object.
• Based on the fact
• (1) When the object is moving, the centroids
  of some color bins(belongs to the object) is
  moving the same way with the object.
• (2) The background bins' centroids is also
  moving but in a relatively slowly way and moving
  in the opposite direction of the objects.

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The classical method Algorithm

• Take the differences of the frames(usually to a
  background frame),
• Get the object's position in each frame,
• Obtain the object's moving path.

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Color tracing method Algorithm

• Group bins for each frame
• Find the moving path of the bins, (differences
  of the centrods of the bins)
• Identify the moving object. (connected component
  method.)

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Assumptions

• Objects in the frame have different colors.
• The colors of the pixels belonging to objects'
  body don't change with time.
• The object do not make large rotations during
  moving. The movement of each
• pixel of object parallels to that of the
  object.

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Algorithm (Step 1)

• (1) Make each bin belongs to at most one object.
• Split a bin to equal two parts, test whether
  the small bin parts' centroid move with the same
  trajectory as the original bin.
• YES the bin is considered belongs to only
  one object.
• NO continue to bi-party the small bins,
  till each tiny bin belongs to only one object.

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Algorithm (Step 2,3)

• (2) Group bins
• A Drop the bins with small trajectory
  length.
• B Combine bins with with same slope and
  same length of the trajectory.
• (3) The trajectory of the bins left show us the
  corresponding objects' moving paths.

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Experiments

• Extremely good when the objects have different
  color with the background.
• Very bad when the background is moving.
• Not very good when the objects have same with the
  background

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Conclusion

• The method is first suggested by Professor
  Latecki,
• It works good when the objects have different
  colors with the background.
• It is still under development.

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Thank you!