Image processing apparatus
First Claim
1. An image processing apparatus for processing color images, comprising:
- a feature amount calculation section for calculating a feature amount with respect to a pixel of interest;
a background sensing section for sensing a background density or a background color with respect to a region surrounding the pixel of interest whose feature amount is calculated by the feature amount calculation section;
a plurality of character determination sections for determining whether the pixel of interest corresponds to a character or a line drawing on the basis of the feature amount calculated by the feature amount calculation section, said plurality of character determination sections using mutually different determination methods; and
a character determination selector section for selecting one of determination results output from the character determination sections in accordance with a sensing result output from the background sensing section.
2 Assignments
0 Petitions
Accused Products
Abstract
A number of character string determination sections determine whether a pixel of interest corresponds to a character or a line drawing. The character string determination sections use mutually different determination methods. A character determination selector section selects a determination result output from the character determination section that uses a determination method most suited to a background sensing result obtained by a background sensing section. In this manner, either the character or the line drawing can be determined using an efficient method in accordance with the background state of a color image.
-
Citations
26 Claims
-
1. An image processing apparatus for processing color images, comprising:
-
a feature amount calculation section for calculating a feature amount with respect to a pixel of interest;
a background sensing section for sensing a background density or a background color with respect to a region surrounding the pixel of interest whose feature amount is calculated by the feature amount calculation section;
a plurality of character determination sections for determining whether the pixel of interest corresponds to a character or a line drawing on the basis of the feature amount calculated by the feature amount calculation section, said plurality of character determination sections using mutually different determination methods; and
a character determination selector section for selecting one of determination results output from the character determination sections in accordance with a sensing result output from the background sensing section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An image processing apparatus for processing color images, comprising:
-
a plurality of feature amount calculation sections for determining feature amounts with respect to a pixel of interest by using mutually different determination methods;
a background sensing section for sensing a background density or a background color with respect to a region surrounding the pixel of interest whose feature amount is calculated by the feature amount calculation sections;
a feature amount selection section for selecting one of calculation results output from the feature amount calculation sections in accordance with a sensing result output from the background sensing section; and
a character determination section for determining whether the pixel of interest is a character or a line drawing on the basis of a feature amount selected by the feature amount selection section. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25)
-
-
18. An image processing apparatus for processing color images, comprising:
-
a feature amount calculation section for calculating a feature amount with respect to a pixel of interest;
a background sensing section for sensing a background density or a background color with respect to a region surrounding the pixel of interest;
a plurality of color determination sections for determining colors with respect to the pixel of interest on the basis of a chroma and/or a hue thereof, said color determination sections using mutually different determination methods; and
a color determination selector section for selecting one of determination results output from the color determination sections in accordance with the feature amount the feature amount calculation section determines with respect to the pixel of interest or the background density or color the background sensing section senses.
-
-
26. An image processing apparatus for processing color images, comprising:
-
a feature amount calculation section for calculating a feature amount with respect to a pixel of interest;
a character determination section for determining whether the pixel of interest is a character or a line drawing on the basis of a feature amount calculated by the feature amount selection section; and
a color determination section for determining the color of the pixel of interest by comparing a chroma and/or a hue of a highest-density pixel of a predetermined region surrounding the pixel of interest with reference values.
-
Specification