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Real-Time Image Mosaicing

This research project explores the creation of image mosaics in real-time, enabling users to stitch images from different viewpoints seamlessly. We focus on finding a transformation that minimizes errors between two images, whether from a planar scene or arbitrary orientations. Using innovative techniques, including hardware-accelerated texture mapping and hierarchical algorithms, we achieve interactive image processing. Our results showcase full panoramic views and demonstrate the project's potential in creating engaging visual experiences with optimized transforms in real-time.

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Real-Time Image Mosaicing

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  1. Real-Time Image Mosaicing --Research Project for 15-869, Nov 29, 1999 Li Zhang

  2. Image Mosaicing • Stitching together images taken from different viewpoints seamlessly • Representation: cylindrical, spherical, and perspective panoramas

  3. Problem Statement • Given two images I0 and I1 of a scene, find a transform T that minimizes

  4. Special cases • If the scene is planar, and I0 and I1are taken from different viewpoints with different orientation, • If the scene is arbitrary, and I0 and I1are taken from same viewpoint with different orientation, T is a planar perspective transform M

  5. My work • Given two images I0 and I1 of a scene, find a transform M that minimizes • Search M interactively in real-time

  6. Illustration

  7. Algorithm Details(1) • Given I0, I1 and current M,we iteratively update M using • We wish D to minimize

  8. Algorithm Details(2) • We warp I1 into I1’ such that • We instead wish D to minimize

  9. Acceleration Details(1) • We find d by solving a least-square minimization problem with following acceleration techniques: • Approximate the Jacobian as

  10. Acceleration Details(2) • Warp I1’ from I1using hardware-accelerated texture mapping; • Perform minimization hierarchically using OpenGL Mipmaps.

  11. Results(1) • Real images of University Center Mural

  12. Results(2) • Full view panorama of UC Mural

  13. Summary(1) • Good features: • Users can interactively create image mosaics in real-time • The transform is locally optimized

  14. Summary(2) • 8-parameter transform sometimes get stuck in local minimum • The size of image is limited by frame buffer

  15. Reference • R. Szeliski and H.-Y. Shum. Creating full view panoramic image mosaics and texture-mapped models. Computer Graphics (SIGGRAPH'97), pages 251-258, August 1997.

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