Image processing apparatus and image processing method
AssigneeCanon Kabushiki Kaisha
InventorsShigeo Yamagata, Takeshi Aoyagi
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Abstract
An object of the invention is to effectively and accurately detect a characteristic of an image. In order to achieve the object, the invention comprises a calculating means for calculating an isolated amount of a pixel value in each of plural areas respectively having different sizes, an integrating means for integrating the calculated isolated amount in a predetermined area, and an extracting means for extracting the image portion having the predetermined attribute, according to the integrated isolated amount.
Claims8
An image processing apparatus which extracts a line image portion, comprising:
- calculating means for calculating an isolated amount of a pixel value in each of plural areas respectively having different sizes, the isolated amount representing isolation of a pixel with respect to plural directions in the plural areas;
- means for adding isolated amounts calculated for at least one of the plural areas to obtain one or more sums;
- comparing means for comparing one or more sums of isolated amounts with one or more respective predetermined values;
- discriminating means for discriminating a dot image portion according to an output value of said comparing means;
- and
- extracting means for extracting the line image portion from an image including plural image portions respectively having different attributes, according to a result obtained by said discriminating means.
An image processing method in which a line image portion is extracted, comprising the steps of:
- calculating an isolated amount of a pixel value in each of plural areas respectively having different sizes, the isolated amount representing isolation of a pixel with respect to plural directions in the plural areas;
- adding isolated amounts calculated for at least one of the plural areas to obtain one or more sums;
- comparing one or more sums of isolated amounts with one or more respective predetermined values;
- discriminating a dot image portion according to an output value of said comparing step;
- and
- extracting the line image portion from an image including plural image portions respectively having different attributes, according to a result obtained in said discriminating step.
A computer-readable medium containing program codes for extracting a line image portion, said medium containing program codes for performing the steps of:
- calculating an isolated amount of a pixel value in each of plural areas respectively having different sizes, the isolated amount representing isolation of a pixel with respect to plural directions in the plural areas;
- adding isolated amounts calculated for at least one of the plural areas to obtain one or more sums;
- comparing one or more sums of isolated amounts with one or more respective predetermined values;
- discriminating a dot image portion according to an output value of said comparing step;
- and
- extracting the line image portion from an image including plural image portions respectively having different attributes, according to a result obtained in said discriminating step.
Dependencies are inferred from the claim text.