Ruled line extracting program, ruled line extracting apparatus and ruled line extracting method
First Claim
1. A computer-readable medium storing a ruled line extracting program that causes a computer to execute a process to extract a ruled line in a document image of a document, the process comprising:
- extracting a ruled line candidate from the document image by executing a labeling process on the document image and selecting the ruled line candidate which is a black pixel link component satisfying a first requirement predefined to be met by figures of elements of the ruled lines;
judging if the ruled line candidate is stable or unstable according to a structural stability of the ruled line candidate extracted in the extracting;
determining a second requirement to be met by the figures of the elements of the ruled line different from the first requirement according to the ruled line candidate judged as stable in the judging and the first requirement; and
re-extracting a ruled line candidate according to the second requirement determined in the determining.
1 Assignment
0 Petitions
Accused Products
Abstract
A ruled line extracting apparatus, a ruled line extracting program and a ruled line extracting method re-extract a ruled line by changing the predetermined requirements to be met by ruled line s when a ruled line candidate extracted according to the requirements shows a low reliability. A ruled line extracting program that causes a computer to extract a ruled line in an image of a document comprises an extraction step that extracts a ruled line candidate from the image of a document according to the first requirement predefined to be met by the figures of the elements of the ruled lines, a judgment step that judges if the ruled line candidate is stable or unstable according to the structural stability of the ruled line candidate extracted in the extraction step, a requirement determination step that determines the second requirement to be met by the figures of the elements of the ruled line different from the first requirement according to the ruled line candidate judged as stable in the judgment step and the first requirement and a re-extraction step that re-extracts a ruled line candidate according to the second requirement determined in the requirement determination step.
-
Citations
20 Claims
-
1. A computer-readable medium storing a ruled line extracting program that causes a computer to execute a process to extract a ruled line in a document image of a document, the process comprising:
-
extracting a ruled line candidate from the document image by executing a labeling process on the document image and selecting the ruled line candidate which is a black pixel link component satisfying a first requirement predefined to be met by figures of elements of the ruled lines; judging if the ruled line candidate is stable or unstable according to a structural stability of the ruled line candidate extracted in the extracting; determining a second requirement to be met by the figures of the elements of the ruled line different from the first requirement according to the ruled line candidate judged as stable in the judging and the first requirement; and re-extracting a ruled line candidate according to the second requirement determined in the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A ruled line extracting apparatus that extracts a ruled line in an image of a document, comprising:
-
an extraction section that extracts a ruled line candidate from the image of a document according to a first requirement predefined to be met by figures of elements of the ruled lines; a judgment section that judges if the ruled line candidate is stable or unstable according to a structural stability of the ruled line candidate extracted by the extraction section; a requirement determination section that determines a second requirement to be met by the figures of the elements of the ruled line different from the first requirement according to the ruled line candidate judged as stable by the judgment section and the first requirement; and a re-extraction section that re-extracts a ruled line candidate according to the second requirement determined by the requirement determination section. - View Dependent Claims (15, 16, 17, 18, 19)
-
-
20. A ruled line extracting method of extracting a ruled line in a document image of a document, the method comprising:
-
using an extraction section for extracting a ruled line candidate from the document image by executing a labeling process on the document image and selecting the ruled line candidate which is a black pixel link component satisfying a first requirement predefined to be met by figures of elements of the ruled lines; using a judging section for judging if the ruled line candidate is stable or unstable according to the structural stability of the ruled line candidate extracted in the extracting; using a requirement determination section for determining a second requirement to be met by the figures of the elements of the ruled line different from the first requirement according to the ruled line candidate judged as stable in the judging and the first requirement; and using a re-extraction section for re-extracting a ruled line candidate according to the second requirement determined in the determining.
-
Specification