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# Anisotropic filtering

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Hi, i need realize software anisotropic filtering, help please, where i can find: theory, algorithms ? On wiki not useful information, thank.

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thank

and, possible example realisation software ?

or more simple example, and i need software implementation, and not hardware.

Edited by NEvOl

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I understand it uses a sample on an ellipse rather than a circle (like the square with bilinear filtering), but I do not understand how to calculate this ellipse, please tell me.

I understand that the major and minor radius of the ellipse depend on the inclination of the plane of the screen space, so you can use a vector along which to interpolate texels (x2 -> 2 texel x4 -> 4 texel ...)?

Edited by NEvOl

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Isn't that something graphics card can do for you nowadays?

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can, but i need namely software implementation:)

Help, please.

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Here another elliptical-like implementation (well documented imo): http://ronaldperry.org/FelineSig1999.pdf and another here: http://graphics.cs.aueb.gr/graphics/docs/papers/I3D11_EllipticalFiltering_draft.pdf

Here is a recursive implementation: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.106.5735&rep=rep1&type=pdf

If you still have issues with the AF filtering it's better you ask into Graphics Programming and Theory forum.

Edited by Alessio1989

thanks for help)

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What can you say about EWA filter, whether it is good for the software implementation ?

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