Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-10-17
1997-01-14
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358536, H04N 152
Patent
active
055948391
ABSTRACT:
A K separation screen comprises a grid of dots located at fixed positions, with the screen angle for each color, including black, maintained at 45.degree.. All of the primary color dots are printed at a predetermined screen frequency at predetermined locations. The black dots are also printed at a fixed screen frequency at predetermined locations. However, the black dots are printed in a different screen phase from the other colors, in particular, the phase offset is equal to one-half the screen frequency. Apparatus and a method are disclosed for generating the K separation screen using a cluster dot dithering array and offsetting the array pattern used to generate the colored halftone dots from the array pattern used to generate the black halftone dots.
REFERENCES:
patent: 4752822 (1988-06-01), Kawamura
patent: 4774567 (1988-09-01), Stansfield et al.
patent: 4955065 (1990-09-01), Ulichney
patent: 4974067 (1990-11-01), Suzuki et al.
patent: 5055942 (1991-10-01), Levien
patent: 5155599 (1992-10-01), Delabastita
patent: 5172248 (1992-12-01), Urabe et al.
patent: 5285291 (1994-02-01), Schiller
patent: 5305118 (1994-04-01), Schiller et al.
Angling for Color, B. Fraser, Publish Jun. (1991) pp. 74-82.
Society for Information Display Intern. Symposium Digest of Technical Papers vol. XXV, San Jose, CA, Jun. 14-16, (1994); Adaptive Error Diffusion for Multiresolution Rendering, P. W. Wong, pp. 801-804.
Society for Information Display Intern. Symposium Digest of Technical Papers vol. XXV, San Jose, CA, Jun. 14-16, (1994); An Efficient Implementation for Stochastic DBS, T. J. Flohr et al. pp. 797-800.
Society for Information Display Intern. Symposium Digest of Technical Papers vol. XXV, San Jose, CA, Jun. 14-16, (1994); The Blue-Noise Mask and Its Comparison with Error Diffusion in Color Halftoning, M. Yao et al., pp. 805-808.
Janofsky Eric B.
Rogers Scott A.
Seiko Epson Corporation
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