In this paper, we consider a dual-mode halftoning system for electrophotographic printers; a low frequency halftoning for smooth regions and a high frequency halftoning for detail regions. This screen-switching approach has a stable halftone pattern in smooth areas and preserves fine rendering in detail areas, but undesirable jaggies may occur along the boundaries where the low and high frequency screens meet. To reduce the jaggies, we propose a new approach to blend two halftone patterns based on a transition region built around boundary pixels. In addition, we provide an implementation methodology which requires simple structure, minimal memory, and small processing time.
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