Nvidia's algorithm is clearly aimed at real-time by being on the speed side of the speed/quality trade-off. While it is a clear improvement over a simple box filter, it is still a comparably low-quality filter they're using. Unfortunately, the paper shows only a coarse checkerboard texture, it would be interesting to see how good it is at eliminating aliasing whith textures that have fine 1-pixel lines. Poser's mip map generation is loosely based on OpenEXR's exrmaktetiled. You can get the source code of exrmaktetiled at http://www.openexr.com/.