Texture matching

@article{Richards1974TextureM,
  title={Texture matching},
  author={Whitman Richards and Andres C. Polit},
  journal={Kybernetik},
  year={1974},
  volume={16},
  pages={155-162}
}
All one-dimensional textures can be constructed by suitable combinations of sine waves, by use of Fourier methods. Rather than requiring an infinite series to match the perceptions of all such textures, however, the human observer needs only four suitably chosen spatial frequencies mixed together in the correct proportions. This result implies that one-dimensional texture perception is based upon four physiological spatial filters. 

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References

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