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EE368b Project

EE368b Project. Evaluation of search strategies for block matching Marcus Isaksson Joakim Jalden. Evaluation of search strategies for block matching. Joakim Jald₫n and Marcus Isaksson. Block matching. Main goals of a block matching scheme Find best match for any given block

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EE368b Project

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  1. EE368b Project Evaluation of search strategies for block matching Marcus Isaksson Joakim Jalden Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  2. Block matching • Main goals of a block matching scheme • Find best match for any given block • Minimize number of block comparisons • Contradictory goals Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  3. Presentation overview • Distortion function • Search strategies • Test data • Algorithm performance • Conclusions Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  4. Distortion measurement • Mean square error • Bilinear interpolation is used for non-integer values of i and j. Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  5. Search strategies • Full search • 2D logarithmic search • Jain J.R., Jain A.K., 1981 • Conjugate direction search • Srinivasan R., Rao K.R., 1985 Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  6. Conjugate direction search Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  7. Description of test data • Suzie1 • Frames 47-52 from the suzie qcif sequence • Limited motion in parts of the image, different directions • Foreman • Frames 308-313 from the foreman qcif sequence • Panning camera, large motion over the whole image Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  8. Suzie1 Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  9. Foreman Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  10. Distortion function Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  11. Choosing a start point for the search • Use motion vectors from adjacent blocks Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  12. Results Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  13. Results Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

  14. Conclusions • Major speedups compared to full search • Number of block comparisons reduced by a factor 100 for integer pel • 500 for quarter pel • Conjugate direction with memory is the fastest strategy, but sensitive to selection of start point • If time is not a problem: choose full search Evaluation of search strategies for block matching Joakim Jald₫n and Marcus Isaksson

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