Character region extracting method and apparatus capable of implementing the method
First Claim
1. A character region extracting method for character recognition comprising the steps of;
- segmentating a first region (BL1) from a document image by extracting projection of the document image in a first direction parallel to a character string and detecting a range in which the projection is continuous in a second direction perpendicular to the first direction, the range defining the first region;
segmentating a second region (sBL1) from the first region by extracting projection of the first region in the second direction and detecting a range in which the projection is continuous in the first direction, the range defining the second region; and
segmentating a third region (BL2) from the second region by extracting projection of the second region in the first direction and detecting a range in which the projection is continuous in the second direction, the range defining the third region.
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Abstract
A character region extracting method adapted to character recognition comprises the following three steps. The first step is to segmentate a first region (BL1) from a document image by extracting projection of the document image in a first direction parallel to a character string and detecting a range in which the projection is continuous in a second direction perpendicular to the first direction. The range defines the first region. The second step is to segmentate a second region (sBL1) from the first region by extracting projection of the first region in the second direction and detecting a range in which the projection is continuous in the first direction. The range defines the second region. The third step is to segmentate a third region (BL2) from the second region by extracting projection of the second region in the first direction and detecting a range in which the projection is continuous in the second direction. The range defines the third region. The third region may be joined together so as to form a fourth region containing characters or a character string.
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Citations
17 Claims
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1. A character region extracting method for character recognition comprising the steps of;
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segmentating a first region (BL1) from a document image by extracting projection of the document image in a first direction parallel to a character string and detecting a range in which the projection is continuous in a second direction perpendicular to the first direction, the range defining the first region; segmentating a second region (sBL1) from the first region by extracting projection of the first region in the second direction and detecting a range in which the projection is continuous in the first direction, the range defining the second region; and segmentating a third region (BL2) from the second region by extracting projection of the second region in the first direction and detecting a range in which the projection is continuous in the second direction, the range defining the third region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A character region extracting apparatus adapted to character recognition comprising;
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optical scanning means for extracting a document image in the form of an electric signal by optically scanning a document; an image memory for storing the document image extracted by the optical scanning means; projection extracting means for extracting projection of the document image in a first and second direction, the first direction corresponding to a scanning direction in the optical scanning means and the second direction being perpendicular to the first direction; a projection buffer for storing the projection in each of the first and second direction extracted by the projection extracting means; region segmentating means for segmentating a region by using the projection stored in the projection buffer, the region segmentating means further comprising a first means for segmentating a first region (BL1) from the document image by using the extracted projection of the document image in the first direction and detecting a range in which the projection is continuous in the second direction, said range defining the first region;
a second means for segmentating a second region (sBL1) from the first region by using the extracted projection of the first region in the second direction and detecting a range in which the projection is continuous in the first direction, the range defining the second region; and
a third means for segmentating a third region (BL2) from the second region by using the extracted projection of the second region in the first direction and detecting a range in which the projection is continuous in the second direction, the range defining the third region; andmemory means for storing the extracted third region. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification