Method and apparatus for replicating a two-color original image

Details Method and apparatus for replicating a two-color original image Method and apparatus for replicating a two-color original image

1991-08-19

1994-03-15

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 17, 358530, 358537, H04N 946, H04N 146

Patent

active

052952029

ABSTRACT:
Replication of a two-color original image with foreground and background colors exchanged is effected on a received signal representing the color information of each successive pixel of a two-color original image by generating a histogram of the color data distribution for each color plane of the original image, determining a translation point within each histogram, and performing a histogram translation of the color plane image data about the translation point. The translation point may be determined by selecting the approximate midpoint between the foreground information and the background information in each histogram as the translation point, or by selecting the statistical average of each histogram as the translation point. Once the translation point is determined, a new color data value for each pixel in a color plane is selected by subtracting the pixel's original color data value from twice the color data value of the translation point.

REFERENCES:
patent: 3745527 (1973-07-01), Yoshimura et al.
patent: 4433345 (1984-02-01), Haddick et al.
patent: 4843573 (1989-06-01), Taylor et al.
patent: 4878178 (1989-10-01), Takakura et al.
patent: 4956704 (1990-09-01), Yamada
patent: 5046118 (1991-09-01), Ajewole et al.
patent: 5091967 (1992-02-01), Ohsawa

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