Marker color conversion apparatus for color image processing dev

Details Marker color conversion apparatus for color image processing dev Marker color conversion apparatus for color image processing dev

1991-02-05

1993-08-31

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 17, 358453, 358461, G06K 960

Patent

active

052416097

ABSTRACT:
A color image processing apparatus comprises an image reading circuit for reading an original image as three color-separated images, a color code generating circuit for generating a color code indicating whether each pixel of the original image is white, black, or chromatic, a color reproducing circuit for generating density data for each pixel corresponding to each of a plurality of recording colors based on the color-separated images, a marker area detecting circuit for detecting a marker on the original image based on the color code generated by the color code generating circuit and for extracting a marker area enclosed by the marker, a density data sampling circuit for sampling density data of pixels on the marker at a sampling point located at a selected distance, corresponding to a predetermined number of pixels, inside of the edge of the marker, and for determining a density data of the marker based on the sample density data, and a density data conversion circuit for converting the density data of pixels on a line within the marker area into the determined density data determined at first on the present line in the marker area.

REFERENCES:
patent: 4538182 (1985-08-01), Saito et al.
patent: 4937662 (1990-07-01), Matsunawa et al.
patent: 4942461 (1990-07-01), Abe et al.
patent: 4953013 (1990-08-01), Tsuji et al.

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