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Proceedings Paper

Synthesizing wide-angle and arbitrary view-point images from a circular camera array
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Paper Abstract

We propose a technique of Imaged-Based Rendering(IBR) using a circular camera array. By the result of having recorded the scene as surrounding the surroundings, we can synthesize a more dynamic arbitrary viewpoint images and a wide angle images like a panorama . This method is based on Ray- Space, one of the image-based rendering, like Light Field. Ray-Space is described by the position (x, y) and a direction (θ, φ) of the ray's parameter which passes a reference plane. All over this space, when the camera has been arranged circularly, the orbit of the point equivalent to an Epipor Plane Image(EPI) at the time of straight line arrangement draws a sin curve. Although described in a very clear form, in case a rendering is performed, pixel of which position of which camera being used and the work for which it asks become complicated. Therefore, the position (u, v) of the position (s, t) pixel of a camera like Light Filed redescribes space expression. It makes the position of a camera a polar-coordinates system (r, theta), and is making it close to description of Ray-Space. Thereby, although the orbit of a point serves as a complicated periodic function of periodic 2pi, the handling of a rendering becomes easy. From such space, the same as straight line arrangement, arbitrary viewpoint picture synthesizing is performed only due to a geometric relationship between cameras. Moreover, taking advantage of the characteristic of concentrating on one circular point, we propose the technique of generating a wide-angle picture like a panorama. When synthesizing a viewpoint, since it is overlapped and is recording the ray of all the directions of the same position, this becomes possible. Having stated until now is the case where it is a time of the camera fully having been arranged and a plenoptic sampling being filled. The discrete thing which does not fill a sampling is described from here. When arranging a camera in a straight line and compounding a picture, in spite of assuming the pinhole camera model, an effect like a focus shows up. This is an effect peculiar to Light Field when a sampling is not fully performed, and is called a synthetic aperture. We have compounded all focal images by processing called an "Adaptive Filter" to such a phenomenon. An adaptive filter is the method of making the parallax difference map of perfect viewpoint dependence centering on a viewpoint to make. This is a phenomenon produced even when it has arranged circularly. Then, in circular camera arrangement, this adaptive filter is extended, and all focal pictures are compounded. Although there is a problem that an epipor line is not parallel etc. when it has arranged circularly, extension obtains enough, it comes only out of geometric information, and a certain thing is clarified By taking such a method, it succeeded in performing a wide angle and arbitrary viewpoint image synthesis also from discrete space also from the fully sampled space.

Paper Details

Date Published: 30 January 2006
PDF: 8 pages
Proc. SPIE 6056, Three-Dimensional Image Capture and Applications VII, 60560Z (30 January 2006); doi: 10.1117/12.643508
Show Author Affiliations
Norishige Fukushima, Nagoya Univ. (Japan)
Tomohiro Yendo, Nagoya Univ. (Japan)
Toshiaki Fujii, Nagoya Univ. (Japan)
Masayuki Tanimoto, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 6056:
Three-Dimensional Image Capture and Applications VII
Brian D. Corner; Peng Li; Matthew Tocheri, Editor(s)

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