Multi-color marker editing system

Claim 2

A multi-color marker editing system for editing a color image by reading a designated marker, comprising: image reading means for reading color image data at a first pixel density; color-coordinate converting means for converting the read color image data into color image data in a color coordinate system defined by optical density, hue and saturation; color detecting means for detecting pixels having a designated marker color in the color-coordinate converted color image data and forming a first marker color image having the first pixel density; image density converting means for converting first marker color image data associated with the first marker color image to second marker color image data having a second pixel density lower than the first pixel density, and for converting the second marker color image data to third marker color image data having the first pixel density, the conversions from the first marker color image data to the third marker color image data by the image density converting means serving to remove ghosts from the first marker color image; and marker editing means for editing said second marker color image data before the second marker color image data is converted to the third marker color image data, wherein said marker editing means edits the second marker color image data so as to fill a first image portion corresponding to a closed area designated by a marker and a second image portion corresponding to an area other than the closed area with data different from each other, thereby removing any ghosts from both the first and second image portions of the second marker color image data.

Claim 3

The multi-color marker editing system according to claim 1, wherein the color detecting means sets data indicating that a pixel of the first marker color image is a marker portion when a corresponding pixel of the color-coordinate converted color image data is the designated marker color; and wherein said image density converting means compresses a block of (n×m) (where n and m are positive integers) pixels of said first marker color image data to one pixel, and sets the compressed pixel to data indicating the marker portion, if a number of pixels having said data indicating the marker portion in the (n×m) pixels is larger than a threshold value, thereby effecting the image density conversion from the first marker color image data to the second marker color image data and removing ghosts from the first marker color image.

Claim 4

The multi-color marker editing system according to claim 1, wherein said image density converting means interpolates the third marker image data.

Claim 7

A multi-color marker editing system for editing a color image by a designated marker comprising: image reading means for reading color image data at a first pixel density; color-coordinate converting means for converting the read color image data into color image data in a color coordinate system defined by optical density, hue and saturation; color detecting means for detecting pixels having a designated marker color in the color-coordinate converted color image data and forming a first marker color image having the first pixel density, the color detecting means sets data indicating that a pixel of the first marker color image is a marker portion when a corresponding pixel of the color-coordinate converted color image data is the designated marker color; image density converting means for converting first marker color image data associated with the first marker color image to second marker color image data having a second pixel density lower than the first pixel density, and for converting the second marker color image data to a third marker color image data having the first pixel density, wherein said image density converting means compresses a block of (n×m) (where n and m are positive integers) pixels of said first marker color image data to one pixel, and sets the compressed pixels to data indicating the marker portion, if a number of pixels having said data indicating the marker portion in the (n×m) pixels is larger than a threshold value, thereby effecting the image density conversion from the first marker color image data to the second marker color image data and removing ghosts from the first marker color image; and marker editing means for editing said second marker color image data before the second marker color image data is converted to the third marker color image data to remove ghosts from the second marker color image data.

Claim 8

A multi-color marker editing system for editing a color image by a designated marker comprising: image reading means for reading color image data at a first pixel density; color-coordinate converting means for converting the read color image data into color image data in a color coordinate system defined by optical density, hue and saturation; color detecting means for detecting pixels having a designated marker color in the color-coordinate converted color image data and forming a first marker color image having the first pixel density, the color detecting means sets data indicating that a pixel of the first marker color image is a marker portion when a corresponding pixel of the color-coordinate converted color image data is the designated marker color; image density converting means for converting first marker color image data associated with the first marker color image to second marker color image data having a second pixel density lower than the first pixel density, and for converting the second marker color image data to a third marker color image data having the first pixel density, wherein said image density converting means compresses a block of (n×m) (where n and m are positive integers) pixels of said first marker color image data to one pixel, and sets the compressed pixels to data indicating the marker portion, if a number of pixels having said data indicating the marker portion in the (n×m) pixels is larger than a threshold value, thereby effecting the image density conversion from the first marker color image data to the second marker color image data and removing ghosts from the first marker color image; and marker editing means for editing said second marker color image data before the second marker color image data is converted to the third marker color image data to remove ghosts from the second marker color image data.

Claim 9

The multi-color marker editing system according to claim 5, wherein said marker editing means stores the second marker color image data corresponding to a plurality of respective colors into a bit map memory, and removes ghosts inside and outside the closed area designated by said marker.