Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1996-09-27
1998-07-28
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
358455, 358467, 358536, 399180, H04N 140
Patent
active
057868433
ABSTRACT:
An improved method of line screen printing. Instead of screening the image with only one set of lines, the image is also screened with a second set of lines, which are substantially orthogonal to those of the first set. (FIG. 3). The screening is accomplished with two types of cells, horizonal cells and vertical cells. The pixels are classified according to their distance from the nearest line in the horizontal cells. This process is repeated with respect to the vertical cells. (FIG. 5). Different tone curves, which map input pixel values to output pixel values, are associated with different pixel classifications. In general, pixels closer to lines have tone curves that map to higher output values. (FIGS. 6 and 7). Because each pixel is in both a horizontal cell and a vertical cell, each pixel has two values from the tone curves. For each pixel, its two tone curve values are combined to obtain a greyscale value for that pixel.
REFERENCES:
patent: 5654808 (1997-08-01), Herregods et al.
Miller, Rodney, et al., Human Vision Visual Processing and Digital Display IV, SPIE, vol. 1913, 1993, pp. 367-377.
Donaldson Richard L.
Kesterson James C.
Le N.
Pham Hai C.
Reed Julie L.
LandOfFree
Two-dimensional modulation for line screen printing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-dimensional modulation for line screen printing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-dimensional modulation for line screen printing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-26715