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Green Image
Issue No. 06 - Nov.-Dec. (2011 vol. 31)
ISSN: 0272-1716
pp: 68-83
C. Wyman , Univ. of Iowa, Iowa City, IA, USA
V. Popescu , Purdue Univ., West Lafayette, IN, USA
P. Rosen , Univ. of Utah, Salt Lake City, UT, USA
Researchers have used depth images to approximate scene geometry in a variety of interactive 3D graphics applications. Previous researchers constructed images using orthographic or perspective projection, which limits the approximation quality to what's visible along a single view direction or from a single viewpoint. Images constructed with nonpinhole cameras can improve approximation quality at little additional cost, if the camera offers fast projection. For such a camera, the fundamental operation of ray-and-depth-image intersection proceeds efficiently by searching along the 1D projection of the ray onto the image. A proposed method extends epipolar geometry constraints to nonpinhole cameras for two-camera configurations. Researchers have demonstrated nonpinhole depth images' advantages in the context of reflections, refractions, relief texture mapping, and ambient occlusion. The Web extra is a video that shows how nonpinhole depth images provide advantages regarding reflection, refraction, relief texture mapping, and ambient occlusion.
rendering (computer graphics), approximation theory, geometry, interactive systems, reflections, nonpinhole approximations, interactive rendering, scene geometry, interactive 3D graphics applications, perspective projection, orthographic projection, ray-and-depth-image intersection, epipolar geometry constraints, refractions, relief texture mapping, ambient occlusion, Cameras, Geometry, Approximation methods, Rendering (computer graphics), Image segmentation, graphics and multimedia, nonpinhole camera, single-pole occlusion camera, graph camera, depth image, impostor, epipolar constraints, reflection, refraction, relief texture mapping, ambient occlusion, interactive 3D graphics, computer graphics

C. Wyman, K. Hayward, V. Popescu and P. Rosen, "Nonpinhole Approximations for Interactive Rendering," in IEEE Computer Graphics and Applications, vol. 31, no. , pp. 68-83, 2011.
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