Two-dimensional modulation for line screen printing

Details Two-dimensional modulation for line screen printing Two-dimensional modulation for line screen printing

G - Physics

03

G

G03G 15/04 (2006.01) G03G 13/04 (2006.01) H04N 1/40 (2006.01) H04N 1/405 (2006.01)

Patent

CA 2185829

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. 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. 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. 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.

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