Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
1999-12-22
2003-05-20
Jankus, Almis R. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
C345S422000, C345S419000
Reexamination Certificate
active
06567085
ABSTRACT:
TECHNICAL FIELD
This invention relates to the integration of three-dimensional computer graphics and a two-dimensional image to provide a realistic three-dimensional virtual reality experience.
BACKGROUND OF THE INVENTION
The display of a three-dimensional virtual reality world to a user requires considerable computation power, and it is typically costly to develop the necessary highly detailed models required for doing so. In order to simplify the problem, two-dimensional images, such as videos or photographs, may be used to represent or simulate portions of the three-dimensional world. A great reduction in computation power and cost can be achieved by such an arrangement.
A limitation of such a world occurs when a user moves within the world and views the world from a location different than the original context of the two-dimensional image which has been carefully calibrated to “fit into” the world. View changes, such as from a location different than the image's ideal viewing point also known as the “center of projection,” result in the image not aligning or fitting well with surrounding objects of the three-dimensional world. Display techniques, however, to deal with such viewpoint changes are described in applicant's co-pending application which discloses manipulating the two-dimensional image through the use of so-called “pyramidic panel structures.” More specifically, the two-dimensional image is manipulated so as to adjust the image's vanishing point(s) in accordance with the movement of the user. In this manner, as the user moves away from the ideal viewing point, warping acts to limit the discontinuities between the two-dimensional image and the surroundings of the world. However, these latter novel display techniques have the disadvantage that they work primarily for so-called “corridor-like” two-dimensional images, such as roads, or streets, wherein parallel features appear to converge at a so-called “vanishing point.”
SUMMARY OF THE INVENTION
Although in my co-pending application, so-called “pyramidic panel structures” are employed to adjust the image's vanishing point(s) in accordance with the movement of the user, such structures have the disadvantage that they work primarily for “corridor-like” two-dimensional images. I have recognized that, in accordance with the principles of the invention, viewpoint changes may also be dealt with by partitioning the two-dimensional image into polygon partitions, each corresponding to a surface being depicted in the image, and then coupling the vertices of the polygon partitions with the movement of the user so as to limit distortions. More specifically, image points located farther away from the view plane oft he user move more closely with the movement oft he user's current view point than those image points located closer. In this manner, as the viewer moves away from the image's ideal viewing point, IVP, the resulting warping in the image acts to counteract and limit distortions. Importantly, in this latter approach, two-dimensional images are not treated as so-called “corridor-like” images, thereby allowing a wider variety of two-dimensional images to be used with the present invention.
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Youichi Horry et al., “Tour Into The Picture: Using A Spidery Mesh Interface To Make Animation From A Single Image,” Computer Graphics Proceedings, Annual Conference Series, 1997, pp. 225-232.
De Le Rosa & De Le Rosa LLC
Jankus Almis R.
Lucent Technologies - Inc.
Sealey Lance W.
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