Methods and apparatus to encode and/or decode normals of geometric representations of surfaces

    公开(公告)号:US10733766B2

    公开(公告)日:2020-08-04

    申请号:US15475639

    申请日:2017-03-31

    Applicant: Google Inc.

    Abstract: Methods and apparatus to encode and/or decode normals of geometric representations of surfaces are disclosed herein. An example method includes receiving a plurality of points, each point representing a normal to the surface and being arranged within a tile; generating a plurality of regions within the tile, each region including points of the plurality of points; retrieving a first and second point, the first point representing a first normal and the second point representing a second normal, the first point being outside of a specified baseline region; performing a point transformation operation on the first point to produce a transformed first point of the baseline region and performing the point transformation on the second point to produce a transformed second point; generating a difference between the transformed first point and the transformed second point to produce a difference value; and encoding the difference value.

    METHODS AND APPARATUS TO ENCODE AND/OR DECODE NORMALS OF GEOMETRIC REPRESENTATIONS OF SURFACES

    公开(公告)号:US20180108151A1

    公开(公告)日:2018-04-19

    申请号:US15475639

    申请日:2017-03-31

    Applicant: Google Inc.

    Abstract: Methods and apparatus to encode and/or decode normals of geometric representations of surfaces are disclosed herein. An example method includes receiving a plurality of points, each point representing a normal to the surface and being arranged within a tile; generating a plurality of regions within the tile, each region including points of the plurality of points; retrieving a first and second point, the first point representing a first normal and the second point representing a second normal, the first point being outside of a specified baseline region; performing a point transformation operation on the first point to produce a transformed first point of the baseline region and performing the point transformation on the second point to produce a transformed second point; generating a difference between the transformed first point and the transformed second point to produce a difference value; and encoding the difference value.

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