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Announcements

This announcement is about the review on Thursday for Project 4, which is due on Wednesday night or no later than Friday night with late days. There will be an extra office hour on Friday from 4-5. The project involves photograph virtual camera morphed view interpolation. The goal is to produce physically correct view interpolations and valid camera transitions. The announcement also mentions the special case of morphing parallel views with linear image and camera motion. The three steps for view morphing are prewarping, aligning views, morphing by moving the camera, and postwarping by point camera correction. The announcement provides relevant keywords and references for further exploration.

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Announcements

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Presentation Transcript

  1. Announcements • Review on Thurs • Project 4 • due Wed night • no later than Friday night (with late days) • Extra office hour: Friday 4-5

  2. Photograph Photograph

  3. Virtual Camera Morphed View

  4. View Interpolation • Problem Statement • Input: two views of an unknown rigid scene • from unknown viewpoints • Output: in-between views from a virtual camera

  5. Image Morphing Photograph Photograph Photograph Morphed Image Photograph • Linear Interpolation of 2D shape and color

  6. Not quite... Image Morphing for View Synthesis? • We want physically-correct view interpolations • Can image morphing do this? • Goal: extend to handle changes in viewpoint • Produce valid camera transitions

  7. Special Case: Parallel Cameras LeftImage MorphedImage RightImage • Morphing parallel views new parallel views • Linear image motion linear camera motion • Works because projection matrices have a special form

  8. View Morphing in 3 Steps Input Output Input

  9. View Morphing in 3 Steps • 1. Prewarp • align views

  10. View Morphing in 3 Steps • 1. Prewarp • align views • 2. Morph • move camera

  11. View Morphing in 3 Steps • 1. Prewarp • align views • 2. Morph • move camera • 3. Postwarp • point camera

  12. Corrected Photographs Face Recognition

  13. Videos • View morphing • Blanz & Vetter (SIGGRAPH 99) • MIT single view (SIGGRAPH 01) • Yu inv-radiosity (SIGGRAPH 00) • Debevec relight (SIGGRAPH 02) • Video rewrite (SIGGRAPH 97) • Vision-based pong (Seitz tape) • Debevec IBMR in art & cinema tape • Debevec face relighting demo

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