UIUC CS 498 - Computational Photography - Final project presentation

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UIUC CS 498 - Computational Photography - Final project presentation

  1. 1. Computational Photography -Final Project- Miniature Photography Jia-Bin Huang [email_address]
  2. 4. Outline <ul><li>Introduction of fake blur </li></ul><ul><li>Process Overview </li></ul><ul><li>Depth-of-Field (DOF) Specification </li></ul><ul><li>Results </li></ul><ul><li>Discussion </li></ul>
  3. 5. Introduction of Fake Miniature <ul><li>Optical blur </li></ul>Slide credit: Rebert Held
  4. 6. Normal Lens Slide credit: Rebert Held
  5. 7. Tilt-Shift Lens Slide credit: Rebert Held
  6. 8. Process Overview <ul><li>Goal: Simulate the Tilt-Shift Effect (i.e., miniature photography) </li></ul><ul><li>Process </li></ul><ul><ul><li>Focus line/region/target selection </li></ul></ul><ul><ul><li>DOF specification </li></ul></ul><ul><ul><li>Blur image </li></ul></ul><ul><ul><li>Color Enhancement (optional) </li></ul></ul>
  7. 9. Depth-of-Field (DOF) Specification <ul><li>We lost depth information from the image. </li></ul><ul><li>Assumption: objects on the same straight line are at the same depth. </li></ul><ul><li>Methods to specify DOF </li></ul><ul><ul><li>Horizontal </li></ul></ul><ul><ul><li>Focus line </li></ul></ul><ul><ul><li>Object mask </li></ul></ul><ul><ul><li>Salient region detection </li></ul></ul>
  8. 10. DOF - Horizontal
  9. 11. DOF - Focus Line
  10. 12. DOF – Object Mask
  11. 13. DOF – Salient Region Detection
  12. 14. More Results
  13. 23. Discussion <ul><li>Two main open issues </li></ul><ul><ul><li>Depth estimation from single image </li></ul></ul><ul><ul><li>Salient region selection </li></ul></ul><ul><li>Accurate depth information can help create realistic miniature effect </li></ul><ul><li>Salient region selection can help automate the miniature photography process </li></ul>
  14. 24. References <ul><li>[1] Held et al. &quot; Using Blur to Affect Perceived Distance and Size &quot;.  ACM Transactions on Graphics 2010. </li></ul><ul><li>[2] Levin et al. &quot; Image and Depth from a Conventional Camera with a Coded Aperture &quot;. SIGGRAPH 2007. </li></ul><ul><li>[3] Felzenszwalb and Huttenlocher. &quot; Efficient Graph-Based Image Segmentation &quot;. IJCV 2004. </li></ul><ul><li>[4] Achant et al. &quot; Frequency-tuned Salient Region Detection &quot;. CVPR 2009. </li></ul>
  15. 25. Thank You! Questions?

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