A mathematical expression recognizing device comprises a character recognition unit which recognizes characters in a document image, a dictionary storing a pair of evaluation scores for each type of word, the score showing the possibility of belonging to the text and that of belonging to the mathematical expression, an evaluation unit which obtains the evaluation scores showing the possibility of belonging to the text and that of belonging to the mathematical expression for each of the words included in the recognized characters with reference to the dictionary, and a mathematical expression detecting unit which searches for an optimal path connecting words by selecting one of the text and the mathematical expression based on a formative grammar and the evaluation scores showing the possibility of belonging to the text and that of belonging to the mathematical expression for each of the words, thereby detecting characters belonging to the mathematical expression.

Claims

12 · 2 independent · depth 4

12 granted claims

›1.independentA mathematical expression recognizing device comprising:na character recognition unit configured to recognize characters in a document image containin…+5

›2.↳ 1The device according to claim 1, wherein said mathematical expression detection unit comprises:na second dictionary configured to store a connectable …d2

›3.↳ 1The device according to claim 1, further comprising:na memory configured to store a plurality of items of sample information indicating a relation of …d2+3

›4.↳ 3The device according to claim 3, further comprising:na memory configured to store a global evaluation condition determined based on a distribution of …d3+1

›6.↳ 3The device according to claim 3, further comprising:na decomposing unit configured to decompose each mathematical expression detected by said mathemat…d3

›7.independentA mathematical expression recognizing method comprising:nrecognizing characters in a document image containing a text and a mathematical expression;re…+5

›8.↳ 7The method according to claim 7, further comprising:nconfiguring a second dictionary to store a connectable part of speech and mathematical expression…d2

›9.↳ 7The method according to claim 7, further comprising:nstoring a plurality of items of sample information indicating a relation of a normalization size …d2+3

›10.↳ 9The device according to claim 9, further comprising:nstoring a global evaluation condition determined based on a distribution of the heights of the ch…d3+1

›12.↳ 9The device according to claim 9, further comprising:ndecomposing each mathematical expression detected into components; andremoving at least left inde…d3

Classifications

4 codes

IPC · International Patent Classification

Section G — Physics

G06K9/72
G06K9/00

USPC · US Patent Classification

382/229382/187

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Pendency

4.4 y

1,624 days filing → grant

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non-final + final

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1 RCE

Examiner

Bhavesh M. Mehta

art unit 2625 · TC 2600

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Citations: 16 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20020126905 A1	12 Sep 2002

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