Converting lines to other colors

Details Converting lines to other colors Converting lines to other colors

1991-10-02

1994-02-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358530, 358464, H04N 146

Patent

active

052892972

ABSTRACT:
A method for varying the color of an image including lines and background. Where the image includes the colors black and white and a plurality of gray pixels, where gray refers to the presence of pixel values between the maximum and minimum pixel values, inclusive, the image is first converted to a color space, such as for example, r, g, b (red-green-blue). Pixel values are thresholded for differentiation between lines and background. When pixels have a value indicating that the pixel is background, that pixel is set to a background color that has been previously selected. Otherwise, that pixel is set to a foreground color. The result is that background is set to a single color, and lines are set to a second color. Alternatively, where intermediate values are present, the foreground color value may be added to the intermediate level color value to produce a gradually varying colored line.

REFERENCES:
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patent: 4608596 (1986-08-01), Williams et al.
patent: 4862256 (1989-08-01), Markle et al.
patent: 4878181 (1989-10-01), MacKenna et al.
patent: 4975768 (1990-12-01), Takaraga
patent: 5055944 (1991-10-01), Shibahara
patent: 5159443 (1992-10-01), Ando

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