US 7,733,546 B2Granted

Color image processing apparatus

AssigneeOki Data Corporation

InventorKazuyuki Yamada

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Abstract

A color image processing apparatus capable of performing effective trapping process is provided. The apparatus processes color image data expressed by plural colors and comprises a drift information storing portion storing color drift information with respect to each of the plurality of colors; a boundary detecting portion detecting a boundary portion of the image data of the plural colors; a color change detecting portion detecting a color change in the boundary portion of the image data detected by the boundary detecting portion; a color drift direction recognizing portion recognizing a color drift direction with reference to the drift information storing portion according to the color change in the boundary portion detected by the color change detecting portion; and an image correcting portion correcting the color change in the boundary portion of the image data according to the color drift direction recognized by the color drift direction recognizing portion.

Claims6

Dependent claims

A color image processing apparatus for performing an overlay process of a plurality of color image data so as to express respective colors, comprising:

a drift information storing portion that stores an amount of drift among the color image data as color drift information;
a boundary detecting portion that determines a portion between a target pixel and a pixel adjacent to the target pixel to be a boundary portion of the color image data when a concentration difference between the target pixel and the adjacent pixel exceeds a preset threshold value;
and
an image correcting portion that determines whether the boundary portion is a white-on-black portion where no pixel exists or an overlap portion that represents unnecessary overlap by referring to the color drift information stored in the drift information storing portion when the boundary portion is judged, and corrects the color image data by adding, to the white-on-black portion, region image data in which concentrations of the other colors are reduced, and reducing the concentration of the overlap portion.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 11/854,589Filed 13 Sep 2007
Priority: JP 2006-25185815 Sep 2006
Published: US 2008/0068662 A120 Mar 2008
Granted: 8 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G06K 15/02
Arrangements for producing a permanent visual presentation of the output data , e.g. computer output printers: using printers
G06K 15/1826
Adapting the print data to an output condition, e.g. object trapping: object trapping
H04N 1/58
Processing of colour picture signals: edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
G06K
Graphical data reading