Image determining apparatus and image determining method
AssigneeCanon Kabushiki Kaisha
InventorHideo Sato
Life of this patent
Estimating the term…
Abstract
Erroneous determination of an image caused by color shift is prevented. Image data is divided in a sub-scanning direction into a first region where color shift hardly occurs and a second region where color shift easily occurs. There are detected a first color line drawing extending in a main-scanning direction in the first region, a second color line drawing extending in the main-scanning direction and having a width larger than that of the first color line drawing in the second region, and a third color line drawing extending in the sub-scanning direction in the image data. On the basis of the detected first, second, and third color line drawings, it is determined whether a document is a color document or not.
Claims8
An image determining apparatus, comprising:
- a unit configured to divide image data read out of a document in a sub-scanning direction into a first region where color shift hardly occurs and a second region where color shift easily occurs;
- a unit configured to detect a first color line drawing having a predetermined length and width and extending in a main-scanning direction in the first region;
- a unit configured to detect a second color line drawing having a predetermined length and a width larger than that of the first color line drawing and extending in the main-scanning direction in the second region;
- a unit configured to detect a third color line drawing having a predetermined length and width and extending in the sub-scanning direction in the image data;
- and
- a unit configured to determine whether or not the document is a color document on the basis of the number of the first, second, and third color line drawings.
An image determining method, comprising:
- a step of dividing image data read out of a document in a sub-scanning direction into a first region where color shift hardly occurs and a second region where color shift easily occurs;
- a step of detecting a first color line drawing having a predetermined length and width and extending in a main-scanning direction in the first region;
- a step of detecting a second color line drawing having a predetermined length and a width larger than that of the first color line drawing and extending in the main-scanning direction in the second region;
- a step of detecting a third color line drawing having a predetermined length and width and extending in the sub-scanning direction in the image data;
- and
- a step of determining whether or not the document is a color document on the basis of the number of the detected first, second, and third color line drawings.
A computer-readable recording medium having computer-executable program for performing a method, the method comprising:
- a step of dividing image data read out of a document in a sub-scanning direction into a first region where color shift hardly occurs and a second region where color shift easily occurs;
- a step of detecting a first color line drawing having a predetermined length and width and extending in a main-scanning direction in the first region;
- a step of detecting a second color line drawing having a predetermined length and a width larger than that of the first color line drawing and extending in the main-scanning direction in the second region;
- a step of detecting a third color line drawing having a predetermined length and width and extending in the sub-scanning direction in the image data;
- and
- a step of determining whether or not the document is a color document on the basis of the number of the detected first, second, and third color line drawings.
Dependencies are inferred from the claim text.