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    Clustering
    2.
    发明专利
    Clustering 未知

    公开(公告)号：GB2355089A

    公开(公告)日：2001-04-11

    申请号：GB0015029

    申请日：2000-06-21

    Applicant: IBM

    Inventor： INOUE KEISUKE ,  ITOH TAKAYUKI ,  YAMADA ATSUSHI ,  FURUHATA TOMOTAKE

    IPC: G06F17/50 ,  G06T15/00 ,  G06T17/20 ,  G06T19/00

    Abstract: To automatically, in accordance with the intent of a designer, divide multiple faces constituting a three-dimensional object into one or more areas, a clustering unit 32 accepts a shape model that expresses constituent faces for a three-dimensional shape, and restrictive condition data that designate which of these faces must be sorted into the same (or a different) cluster. The clustering unit 32 selects, from the shape model, faces that must be included in the same cluster and combines them to form an initial cluster. In accordance with the restrictive condition, the clustering unit 32 sequentially forms clusters for which the directions of normal lines do not differ greatly, and that provide a smooth frame line after the clusters have been combined. As the final result of the processing, clusters are output that ensure an area equal to or greater than an appropriate area.

    3.
    发明专利
    未知

    公开(公告)号：DE69912046T2

    公开(公告)日：2004-06-24

    申请号：DE69912046

    申请日：1999-08-10

    Applicant: IBM ,  UNIV PITTSBURGH CARNEGIE MELLO

    Inventor： ITOH TAKAYUKI ,  INOUE KEISUKE ,  YAMADA ATSUSHI ,  SHIMADA KENJI

    IPC: G06F17/50 ,  G06T17/20 ,  G06T17/40

    Abstract: A quadrilateral or a hexahedron is used for a virtual object. If, for example, a quadrilateral mesh is composed of perfect squares and a voronoi diagram is dual to them, it is considered that the voronoi diagram comprises the perfect squares whose centers are connected to be a quadrilateral mesh. Accordingly, the quadrilateral mesh is generated by filling the object to be meshed with quadrilateral virtual objects corresponding to the voronoi diagram and connecting their centers.

    5.
    发明专利
    未知

    公开(公告)号：AT252257T

    公开(公告)日：2003-11-15

    申请号：AT99306322

    申请日：1999-08-10

    Applicant: IBM ,  UNIV CARNEGIE MELLON

    Inventor： ITOH TAKAYUKI ,  INOUE KEISUKE ,  YAMADA ATSUSHI ,  SHIMADA KENJI

    IPC: G06F17/50 ,  G06T17/20 ,  G06T17/40

    Abstract: A quadrilateral or a hexahedron is used for a virtual object. If, for example, a quadrilateral mesh is composed of perfect squares and a voronoi diagram is dual to them, it is considered that the voronoi diagram comprises the perfect squares whose centers are connected to be a quadrilateral mesh. Accordingly, the quadrilateral mesh is generated by filling the object to be meshed with quadrilateral virtual objects corresponding to the voronoi diagram and connecting their centers.

    8.
    发明专利
    未知

    公开(公告)号：DE69912046D1

    公开(公告)日：2003-11-20

    申请号：DE69912046

    申请日：1999-08-10

    Applicant: IBM ,  UNIV PITTSBURGH CARNEGIE MELLO

    Inventor： ITOH TAKAYUKI ,  INOUE KEISUKE ,  YAMADA ATSUSHI ,  SHIMADA KENJI

    IPC: G06F17/50 ,  G06T17/20 ,  G06T17/40

    Abstract: A quadrilateral or a hexahedron is used for a virtual object. If, for example, a quadrilateral mesh is composed of perfect squares and a voronoi diagram is dual to them, it is considered that the voronoi diagram comprises the perfect squares whose centers are connected to be a quadrilateral mesh. Accordingly, the quadrilateral mesh is generated by filling the object to be meshed with quadrilateral virtual objects corresponding to the voronoi diagram and connecting their centers.

    Area division apparatus and method
    10.
    发明专利
    Area division apparatus and method 未知

    公开(公告)号：GB2355634A

    公开(公告)日：2001-04-25

    申请号：GB0014811

    申请日：2000-06-19

    Applicant: IBM

    Inventor： YAMADA ATSUSHI ,  FURUHATA TOMOTAKE ,  ITOH TAKAYUKI

    IPC: G06T17/30 ,  G06F17/50 ,  G06T15/00 ,  G06T17/20

    Abstract: The invention relates to an area division apparatus for dividing a target area in a two- or higher-dimensional shape into a plurality of predetermined polygonal areas. The apparatus comprises a frame area division means for dividing a portion (a frame area) of the target area adjacent to a boundary (a frame line) between the target area and an area other than said target area into a plurality of said polygonal areas so that any one of points on the frame line is included in one or more of the polygonal areas according to a predetermined rule. The apparatus also comprises an undivided area division means for dividing an undivided area in the target area not yet divided into a plurality of the polygonal areas into one or more of the polygonal areas.

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