Inverse halftoning using binary permutation filters. - Yeong-Taeg Kim; Gonzalo R. Arce; Nikolai A. Grabowski (IEEE Trans. Image Process., 1995)

Weighted median filters with sigma-delta modulation encoding. - Gonzalo R. Arce; Nikolai A. Grabowski; Neal C. Gallagher (IEEE Trans. Signal Process., 2000)