Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1995-06-02
1997-03-25
Couso, Jose L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
358458, H04N 140
Patent
active
056150210
ABSTRACT:
Generating a N-tone image relatively inexpensively with substantially imperceptible dots. The method generates the N-tone image from a grey scale image, both images have many pixels, with each pixel in the grey scale image having a grey level that is within a maximum and a minimum level, and with each pixel in the N-tone image having a level that is one of N levels with N bigger than two and less than the number of levels available for the grey scale image. The method includes the steps of determining the level of each pixel in the N-tone image based on the levels of its corresponding pixel in the grey scale image, and based on either an original dither matrix or an error diffusion technique. Each pixel is modelled by a number of sub-pixels, and each sub-pixel is modelled by a number of segments. Each segment has an intensity whose value depends on its corresponding pixel. The different intensities of the segments when combined together generate N substantially reproducible levels for the N-tone image. Based on the modelling step, the N-tone image is generated with substantially imperceptible dots.
REFERENCES:
patent: 4455562 (1984-06-01), Dolan et al.
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4701811 (1987-10-01), Moriguchi et al.
patent: 4802105 (1989-01-01), Suzuki
patent: 4974067 (1990-11-01), Suzuki et al.
patent: 5086484 (1992-02-01), Katayama et al.
patent: 5111310 (1992-05-01), Parker et al.
patent: 5278670 (1994-01-01), Eschbach
patent: 5309526 (1994-05-01), Pappas et al.
patent: 5341224 (1994-08-01), Eschbach
patent: 5387983 (1995-02-01), Sugiura et al.
patent: 5488673 (1996-01-01), Katayama et al.
patent: 5497180 (1996-03-01), Kawakami et al.
Ulichney, Robert, "Digital Halftoning", The MIT Press, 1987, Chapter 9.3, pp. 340-341.
Floyd, Robert et al., "An Adaptive Algorithm for Spatial Greyscale", Proceedings of the Society of Information Display, vol. 17, 1976, pp. 75-77.
Couso Jose L.
Hewlett--Packard Company
LandOfFree
Print N-tone images with imperceptible dots does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Print N-tone images with imperceptible dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Print N-tone images with imperceptible dots will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2208399