According to the inventor, "The system can be described as a “piece-wise” approach. The printable tone range is first divided into sections, which are separately compensated and screened, before being re-combined for multi-bit output. Tone range sections are shifted based on print measurements, providing accurate linearization. Also, the tone range sections are given adjustable overlapping. This eliminates “screening dead zone” artifacts, while also producing compensation less sensitive to changes."

Patent US 9,053,410     Please click the lower right "Full Screen" icon.  
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