Back to results
US 6,990,235 B2Granted
Color image processing apparatus and pattern extracting apparatus
AssigneeFujitsu Limited
InventorYutaka Katsuyama
Life of this patent
Estimating the term…
Abstract
A threshold value assigning unit assigns a threshold value corresponding to color information of a considered pixel. A labeling unit compares color information of adjacent pixels and assigns the pixels the same label when the distance between the color information of the pixels is less than a threshold value assigned by the threshold value assigning unit.
Claims7
A pattern extracting apparatus, comprising:
- color difference calculating means for calculating the color difference between adjacent pixels of an area represented with a predetermined color;
- threshold value assigning means for assigning a threshold value corresponding to the color difference;
- labeling means for assigning a label to a pixel adjacent to a pixel represented with the predetermined color corresponding to the threshold value;
- print model generating means having meshes of basic colors, basic color dots being disposed at lattice points of the meshes, the meshes being rotated and superimposed on each other, the sizes of the basic color dots being varied, so as to generate a color as a print model;
- and
- color difference table generating means for generating a color difference table that stores luminance values of colors generated by said print model generating means and the color difference between adjacent pixels corresponding to the luminance values in each read resolution of the print model.
3 more elements
The pattern extracting apparatus comprising:
- color difference calculating means for calculating the color difference between adjacent pixels of an area represented with a predetermined color;
- threshold value assigning means for assigning a variable threshold value corresponding to the color difference;
- and
- labeling means for assigning a label to a pixel adjacent to a pixel represented with the predetermined color responsive to the variable threshold value;
- grouping means for categorizing label images labeled by said labeling unit as a group corresponding to the thickness of a pattern of the label image
- wherein said grouping means has:
- contour tracing means for obtaining the contour length of the pattern;
- area calculating means for obtaining the area of the pattern;
- and
- thickness calculating means for obtaining the thickness of the pattern corresponding to the ratio of the area of the pattern and the contour length of the pattern.
7 more elements
Dependencies are inferred from the claim text.