Color halftone error-diffusion with local brightness variation r

Details Color halftone error-diffusion with local brightness variation r Color halftone error-diffusion with local brightness variation r

1997-07-31

1999-11-23

Rogers, Scott

Image analysis

Color image processing

382252, 358534, H04N 1405, H04N 152

Patent

active

059914386

ABSTRACT:
Error diffusion algorithms such as the celebrated Floyd Steinberg error-diffusion algorithm are high-performance halftoning methods in which quantization errors are diffused to "future" pixels. Originally intended for grayscale images, they are traditionally extended to color images by error-diffusing each of the three color planes independently (separable error-diffusion). Adding a design rule which is based on certain characteristics of human color perception to the error-diffusion paradigm results in a color halftoning algorithm having output of considerably higher quality when compared to separable error-diffusion. These benefits are achieved by adding the Minimum Brightness Variation Criterion (MBVC) to the design rules of color error-diffusion halftoning methods. Halftone values are constrained to be vertices of a Minimum Brightness Variation Quadruple (MBVQ) associated with each pixel of the color image being processed. The algorithm presented requires no additional memory and entails a reasonable increase in run-time.

REFERENCES:
patent: 5070413 (1991-12-01), Sullivan et al.
patent: 5375002 (1994-12-01), Kim et al.
patent: 5734369 (1998-03-01), Priem et al.
patent: 5883973 (1999-03-01), Pascovici et al.

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