Appeal No. 1997-2406
Application 08/170,651
The invention relates to computer rendition of images of objects in three-dimensional
space in a two-dimensional array that improves antialias filtering. In particular, Appellant
discloses on page 3 of the specification that N offset sampling points are determined so that
substantially N times oversampling is applied based on a class of image feature. Appellant
discloses that the N sample points may be a regular two-dimensional array whose principal
axes are not aligned with the principal axes of the pixel array. Alternatively, the sub-pixel array
of sample points may constitute a non-regular two-dimensional array. See page 3 of the
specification. Appellant discloses where the array of sample points may be determined as
having a bias toward the periphery of the pixel area. In each case, an overall benefit in aliasing
effects is obtained. Further, three-dimensional objects are represented by primitive data which
comprise geometric and surface descriptions of a plurality of image primitives which make up
the objects. See page 4 of the specification.
The independent claim 1 is reproduced as follows:
1. A method of generating, from primitive data comprising geometric and surface
descriptions of a plurality of image primitives, an image of objects in a three dimensional space
constituted by a regular, two dimensional filtered pixel array having two principal axes, the
method comprising:
using the primitive data to form N renditions comprising respective N intermediate pixel
arrays obtained by imposing respective N different offsets between the primitives and a sample
point for each pixel of said filtered pixel array, said N different
2
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