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Method for extracting three-dimensional color vector

  • US 5,625,762 A
  • Filed: 05/10/1991
  • Issued: 04/29/1997
  • Est. Priority Date: 05/11/1990
  • Status: Expired due to Fees
First Claim
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1. A method for extracting a three-dimensional color vector approximately representing a cluster of plotted points in a three-dimensional RGB primary color space, said plotted points indicating the distribution of the R, G, B components of color pixels of a specific object in a color image, the method comprising the steps of:

  • designating a direction of a first projection plane;

    in response to said step of designating the direction of said first projection plane, projecting said plotted points in said three-dimensional RGB color space on said first projection plane;

    displaying a first projection image of said first projection plane on a display;

    designating a first line segment on said display, said first line segment expressing the feature of a distribution of said plotted points projected on said first projection image;

    in response to said step of designating a first line segment on said display, determining a first equation expressing a first designated plane in said three-dimensional RGB primary color space, said first designated plane being perpendicular to said first projection plane, wherein the projection of said first designated plane on said first projection plane is said first line segment;

    designating the direction of a second projection plane;

    in response to said step of designating the direction of a second projection plane, projecting said plotted points in said three-dimensional RGB primary color space onto said second projection plane;

    displaying a second projection image of said second projection plane on said display;

    designating a second line segment on said display, said second line segment expressing the feature of the distribution of said plotted points projected on said second projection image;

    in response to said step of designating a second line segment on said display, calculating a second equation expressing a second designated plane in said three-dimensional RGB primary color space, said second designated plane being perpendicular to said second projection plane, wherein the projection of said second designated plane on said second projection plane is said second line segment; and

    extracting said three-dimensional color vector by extracting a line of intersection of said first designated plane and said second designated plane from said first equation and said second equation, wherein said line of intersection includes said three-dimensional color vector.

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