Adaptive halftoning based on image content

Details Adaptive halftoning based on image content Adaptive halftoning based on image content

1997-06-30

1999-10-19

Lee, Thomas D.

Image analysis

Image compression or coding

Quantization

H04N 1405

Patent

active

059701781

ABSTRACT:
A process and apparatus is described to improve halftone image quality by integrating different halftoning algorithms and managing their transitions based on image content. The method works by applying different halftoning methods to different regions of a continuous-tone image. Regions of the continuous-tone image are evaluated to determine suitability for halftoning by at least two different halftoning methods. The most suitable halftoning method is then used to halftone a particular region. An activity index is used to evaluate each region. A halftoning method such as error diffusion is deemed most suitable for application to detailed continuous-tone image areas. A halftoning method such as smooth dither is deemed most suitable for application to flat continuous-tone image areas . Also, hysteresis can be introduced to compensate for sharp transitions in the image and thereby eliminate ghosting.

REFERENCES:
patent: 4974097 (1990-11-01), Kaneko et al.
patent: 5701366 (1997-12-01), Ostromoukhov et al.

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