Spherical Mosaics: Regular and Stereoscopic

[View this Stereoscopic Panorama with Red-Blue Stereo Glasses]

Traditional mosaicing methods use narrow field of view cameras to acquire image data. This poses problems when computing a complete spherical mosaic. First, a large number of images are needed to capture a sphere. Second, errors in mosaicing make it difficult to complete the spherical mosaic without seams. Third, with a hand-held camera it is hard for the user to ensure complete coverage of the sphere. This projects presents two approaches to spherical mosaicing. The first is to rotate a 360 degree camera about a single axis to capture a sequence of 360 degree strips. The unknown rotations between the strips are estimated and the strips are blended together to obtain a spherical mosaic. The second approach seeks to significantly enhance the resolution of the computed mosaic by capturing 360 slices rather than strips. A few different slice cameras are proposed that map a thin 360 degree sheet of rays onto a large image area. This results in the capture of high resolution slices despite the use of a low resolution video camera. A slice camera is rotated using a motorized turntable to obtain regular as well as stereoscopic spherical mosaics.


"Motion Deblurring using Hybrid Imaging,"
M. Ben-Ezra and S.K. Nayar,
IEEE Conference on Computer Vision and Pattern Recognition (CVPR),
Vol.I, pp.657-664, Jun, 2003.
[PDF] [bib] [©]

"360 x 360 Mosaics: Regular and Stereoscopic,"
S.K. Nayar and A.D. Karmarkar,
Panoramic Vision, pp.291-307, R., Springer-Verlag, Apr, 2001.
[bib] [©]

"360 x 360 Mosaics,"
S.K. Nayar and A. Karmarkar,
IEEE Conference on Computer Vision and Pattern Recognition (CVPR),
Vol.2, pp.388-395, Jun, 2000.
[PDF] [bib] [©]


  360 x 360 Mosaic:

This mosaic was captured with a single rotation of the slice camera shown below.

  360 x 360 Stereo Mosaic:

These pictures show the left and right spherical mosaics obtained by off-center rotation of the slice camera. Also shown are perspective left and right views for two parts of the scene. Notice the disparities between the left and right views.



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  Slice Camera:

The slice camera is a catadioptric camera that captures a very thin 360 degree slice with high resolution. When the camera is rotated about the center of the captured slice, it produces a single 360 x 360 mosaic. When it is rotated off-center, it produces two 360 x 360 mosaics that together form a stereoscopic spherical mosaic.

  Slice Camera Output:

The slice camera maps a thin 360 degree slice onto a large disc in the image. Even though the detector of the camera has low resolution (640x480 pixels) the mapping performed by the slice camera allows one to compute a high resolution slice of the world.



CVPR 2006 presentation     With videos (zip file)

Catadioptric Cameras for 360 Degree Imaging

Applications of 360 Degree Cameras

Catadioptric Stereo: Planar and Curved Mirrors

Generalized Mosaicing