It's possibly the same (I'm not an expert, just aware of this reference from skimming through the book). Also, the first sentence of the abstract is "This paper

It's possibly the same (I'm not an expert, just aware of this reference from skimming through the book). Also, the first sentence of the abstract is "This paper describes a technique for approximating real-valued pixels by two-valued pixels" and the title says "halftones" so it wouldn't be surprising if the examples look half-tone ish :) Could you implement it and compare? Also, on your original page, what do the three columns under each algorithm (e.g. the three images under "Floyd-Steinberg" in the "Quick Refresher" section) mean?