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Optical Flow Field Model Registration Improvement Method

This project focuses on improving the registration of field models using optical flow techniques. Despite slight tilts in the field causing noise in the frames, a method is employed to align plays and scrimmage lines accurately by manipulating the optical flow. Results show a significant improvement in registration accuracy through iterative stages. Current work involves utilizing COCOA for initial frame registration and potentially applying PCA to enhance testing in the Aladdin dataset.

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Optical Flow Field Model Registration Improvement Method

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  1. Thomas Swift Week 11

  2. Registration to field model • Complete!! • Not perfect- slight tilt/rotation of field at times • Possibly due to error in original registration • Causes noise in OF, which is weeded out through thresholding

  3. Original Video Frames

  4. Registration wrt First Frame

  5. Registration wrt Field Model

  6. Manipulation of Optical Flow • Starting with OF obtained from registered frames, do the following: • Zero out flow from blackened regions (false flow) • Threshold real flow • Rotate flow so that flow of all plays run in same direction (direction determined manually) • Align scrimmage lines to center of field model (centers of scrimmage lines determined manually)

  7. Optical Flow- Original

  8. Optical Flow- Stage 1

  9. Optical Flow- Stage 2

  10. Optical Flow- Stage 3

  11. Optical Flow- Stage 4

  12. Results • Old registration (first frame) • From original OF: 11/23- 47.8% • Through stage 3: 13/23- 56.5% • Through stage 4a: 5/23- 21.7% • Through stage 4b: 8/23- 34.8% • New registration (field model) • From original OF: 7/23- 30.4% • Through stage 2: 5/23- 21.7% • Through stage 3: 4/23- 17.4% • Through stage 4: 3/23- 13.0%

  13. Current Work • Redoing the original first frame registration using COCOA • Appears to be better • If results are better, redo field model registration for plays which previously were poorly registered • Applying PCA to Aladdin dataset to make testing feasible

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