US 12,412,334 B2
Anisotropic texture filtering by combining isotropic filtering results at each of a plurality of sampling points
Rostam King, Hertfordshire (GB)
Assigned to Imagination Technologies Limited, Kings Langley (GB)
Filed by Imagination Technologies Limited, Kings Langley (GB)
Filed on Jun. 24, 2024, as Appl. No. 18/752,412.
Application 18/752,412 is a continuation of application No. 17/873,425, filed on Jul. 26, 2022, granted, now 12,020,366.
Claims priority of application No. 2110742 (GB), filed on Jul. 26, 2021; application No. 2110743 (GB), filed on Jul. 26, 2021; and application No. 2110744 (GB), filed on Jul. 26, 2021.
Prior Publication US 2024/0355037 A1, Oct. 24, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 15/04 (2011.01); G06F 17/18 (2006.01); G06T 7/60 (2017.01); G06T 15/50 (2011.01)
CPC G06T 15/04 (2013.01) [G06F 17/18 (2013.01); G06T 7/60 (2013.01); G06T 15/503 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of performing anisotropic texture filtering, the method comprising:
performing isotropic filtering at each of a plurality of sampling points in an ellipse to be sampled, the ellipse to be sampled based on an elliptical footprint in texture space; and
combining a result of the isotropic filtering at each of the plurality of sampling points to generate a combination result by a sequence of linear interpolations, wherein each linear interpolation in the sequence of linear interpolations comprises blending a result of a previous linear interpolation in the sequence with the isotropic filtering result for one or more of the plurality of sampling points, the one or more of the plurality of sampling points for a linear interpolation being closer to a midpoint of the major axis of the elliptical footprint than the one or more of the plurality of sampling points for the previous linear interpolation in the sequence.