High-quality Compression of Mipmapped Textures

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The Eurographics Association
High-quality texture minification techniques, including trilinear and anisotropic filtering, require texture data to be arranged into a collection of prefiltered texture maps called mipmaps. In this paper we present a compression scheme for mipmapped textures which achieves much higher quality than current native schemes by exploiting image coherence across mipmap levels. The basic idea is to use a high-quality native compressed format for the upper levels of the mipmap pyramid (to retain efficient minification filtering) together with a novel compact representation of the detail provided by the highest-resolution mipmap. Key elements of our approach include delta-encoding of the luminance signal, efficient encoding of coherent regions through texel runs following a Hilbert scan, a scheme for run encoding supporting fast random-access, and a predictive approach for encoding indices of variable-length blocks. We show that our scheme clearly outperforms native 6:1 compressed texture formats in terms of image quality while still providing real-time rendering of trilinearly-filtered textures.

, booktitle = {
V Ibero-American Symposium in Computer Graphics
}, editor = {
Silva, F. and Gutierrez, D. and Rodríguez, J. and Figueiredo, M.
}, title = {{
High-quality Compression of Mipmapped Textures
}}, author = {
Andujar, C.
}, year = {
}, publisher = {
The Eurographics Association
}, ISBN = {
}, DOI = {
} }