Patent US4933984A successfully refreshed from Google Patents.
US4933984A
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Document analysis system
Assignee: Hitachi Ltd
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Filing: 1989-08-25
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Granted: 1990-06-12
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Expires: 2009-08-25
Abstract
Abstract A document analysis system for determining format information of a document, wherein frames and a relationship of the frames are extracted from an image of an unmarked sample document, characters in a frame of the document are recognized, and an image structure is analyzed based on the frame and the recognized characters.
Inventors
- 👤 Yasuaki Nakano
- 👤 Hiromichi Fujisawa
- 👤 Kunihiro Okada
- 👤 Osamu Kunisaki
- 👤 Toshitsugu Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:06
CPC Classifications
G; G06; G06F; G06F40/00; G06F40/10; G06F40/166; G06F40/174; G06V; G06V30/00; G06V30/40; G06V30/41; G06V30/412
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A document analysis system comprising: means for photo-electrically converting an input image from a document to produce digital image data, said input image including a plurality of rectangular areas surrounded by line patterns and characters in a predetermined area of said rectangular areas; means, responsive to the means for converting, for extracting said line patterns from said digital image data; means, responsive to the means for extracting, for extracting a plurality of contours from said extracted line patterns to produce a plurality of frames surrounding said plurality of rectangular areas; means, responsive to the means for extracting a plurality of contours, for identifying a positional relationship between said plurality of frames; means, responsive to the means for extracting a plurality of contours, for recognizing a character included within said predetermined area surrounded by said plurality of frames; and means, responsive to the means for identifying a positional relationship and the means for recognizing a character, for determining format information of said document by comparing said identified positional relationship and said recognized character with predetermined rules on a structure of said document, said predetermined rules being expressed in a "if ˜ then" rule format.
Claim 2
Dependent Claim
193 words
A document analysis system comprising: means for photo-electrically converting an input image from a document to produce digital image data, said input image including a plurality of rectangular areas surrounded by line patterns and characters in a predetermined area of said rectangular areas; means, responsive to the means for converting, for extracting said line patterns from said digital image data; means, responsive to the means for extracting, for extracting a plurality of contours from said extracted line patterns to produce a plurality of frames surrounding said plurality of rectangular areas; means, responsive to the means for extracting a plurality of contours, for identifying a positional relationship between said plurality of frames; means, responsive to the means for extracting a plurality of contours, for recognizing a character included within said predetermined area surrounded by said plurality of frames; and means, responsive to the means for identifying a positional relationship and the means for recognizing a character, for determining format information of said document by comparing said identified positional relationship and said recognized character with predetermined rules on a structure of said document, said predetermined rules being expressed in a "if ˜ then" rule format.
Claim 3
Dependent Claim
21 words
A document analysis system according to claim 1, wherein said means for converting converts an input image from a sample document.
Claim 4
Dependent Claim
16 words
A document analysis system according to claim 1 wherein said predetermined frame area is an item.
Claim 5
Dependent Claim
17 words
A document analysis system according to claim 1 further including means for displaying said plurality of frames.
Claim 6
Dependent Claim
37 words
A document analysis system according to claim 1 wherein said means for determining format information determines a format of an extracted frame area related to said predetermined area based on the recognized character of said predetermined area.
Claim 7
Dependent Claim
22 words
A document analysis system according to claim 5 wherein said plurality of frames related to said predetermined area is a data frame.
Claim 8
Dependent Claim
30 words
A document analysis system according to claim 1 further comprising means for setting format information based on the determined format information of the input image and storing the format information.
Claim 9
Dependent Claim
21 words
A document analysis system according to claim 7 wherein said means for converting converts an input image from a sample document.
Claim 10
Dependent Claim
27 words
A document analysis system according to claim 7 wherein characters in the predetermined frame area of an input document are recognized based on the stored format information.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |