Table recognition apparatus
AssigneeFuji Xerox Co., Ltd.
InventorKatsuhiko Itonori
Life of this patent
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Abstract
A table recognition apparatus for recognizing a table image wherein coexist characters and ruled lines. The apparatus comprises a character/ruled line separating part for separating characters from ruled lines in the table image; a character block extracting part for extracting character blocks from the character image separated by the character/ruled line separating part; and a character block extending part for extending the character blocks extracted by the character block extracting part in such a manner that the edges of the character blocks are aligned according to the positional relations between the blocks.
Claims3
A table recognition apparatus for recognizing a table image having both a character image and a ruled line image, said table recognition apparatus comprising:
- image separating means for separating characters from ruled lines in said table image;
- means for acquiring a rectangular area containing a character in the character image;
- means for producing a threshold from the dimensions of said acquired rectangular area;
- character block extracting means for using said threshold to extract character blocks from the character image separated by said image separating means;
- first character block extending means for extending each of said character blocks up to the nearest one of the ruled lines;
- means for computing a horizontal and a vertical distribution of character blocks to keep each extended character block from overlapping with other ones of the character blocks;
- second character block extending means for further extending the extended character blocks to align the edges of the extended character blocks;
- row extracting means for extracting rows of said table image based on the distance between the extended character blocks;
- and
- column extracting means for extracting columns of said table image based on the distance between the extended character blocks.
A table recognition apparatus for recognizing a table image having both a character image and a ruled line image, said table recognition apparatus comprising:
- image separating means for separating characters from ruled lines in said table image;
- character block extracting means for extracting character blocks from the character image separated by said image separating means;
- rectangular frame extracting means for extracting a rectangle composed of ruled lines, from the ruled line image separated by said image separating means;
- means for converting the extracted ruled lines into a plurality of horizontal and vertical vectors;
- means for comparing said horizontal and vertical vectors to a threshold angle;
- component frame extracting means for extracting as a component frame a rectangular frame including at most one character block;
- means for computing a horizontal and vertical distribution of character blocks
- first character block extending means for using said computed horizontal and vertical distribution of character blocks to extend a target character block up to the nearest one of the ruled lines;
- second character block extending means for further extending the extended character blocks to align the edges of the extended character blocks;
- row extracting means for extracting rows of said table image based on the distance between the extended character blocks;
- and
- column extracting means for extracting columns of said table image based on the distance between the extended character blocks.
A table recognition apparatus for recognizing a table image having both a character image and a ruled line image, said table recognition apparatus comprising:
- image separating means for separating characters from ruled lines in said table image;
- first character block extending means for extending each of said character blocks up to the nearest one of the ruled lines;
- means for computing a horizontal and a vertical distribution of character blocks to keep each extended character block from overlapping with other ones of the character blocks;
- second character block extending means for further extending the extended character blocks to align the edges of the extended character blocks;
- character block normalizing means for normalizing each character block based on the distance between the extended character blocks;
- character block interpolating means for detecting a virtual character block that overlaps the character blocks normalized by said character block normalizing means;
- row extracting means for extracting rows based on the distance between the character blocks interpolated by said character block interpolating means;
- and
- column extracting means for extracting columns based on the distance between the character blocks interpolated by said character block interpolating means.
Dependencies are inferred from the claim text.