Semantic normalization in document digitization

A computer implemented method for normalizing a key in a document image comprising:

• identifying, by one or more processor of a computer, a candidate key corresponding to an object in the document image with a key in key ontology data, based on that the candidate key is semantically interchangeable with the key;
• normalizing the candidate key into a normal form;
• deriving one or more alias of the candidate key from the normal form, wherein the one or more alias is not associated with the key in a semantic database;
• assessing respective confidence score for each of the one or more alias, wherein the confidence score indicates a likelihood of each alias being representative of the candidate key, based on document metadata of the document image;
• and
• updating the semantic database with the one or more alias, based on verifying the one or more alias according to a preconfigured manner of verification, such that the one or more alias may be efficiently associated with a text from other document images, based on that the text semantically matches with the candidate key.

A computer program product comprising:

• a computer readable storage medium readable by one or more processor and storing instructions for execution by the one or more processor for performing a method for normalizing a key in a document image comprising:
• obtaining document metadata of the document image, wherein the document metadata include a context, a position, and a style respective to each object appearing in the document image;
• identifying a candidate key corresponding to an object in the document image with a key in key ontology data, based on that the candidate key is semantically interchangeable with the key;
• normalizing the candidate key into a normal form;
• determining a key class corresponding to the normal form, wherein the key class is associated with the key in the key ontology data;
• assessing a confidence score for the key class, wherein the confidence score indicates a likelihood of the key class being representative of the candidate key, based on the document metadata;
• and
• updating a semantic database with the key class, based on verifying the key class according to a preconfigured manner of verification, such that the key class may be efficiently associated with a semantically interchangeable text appearing in other document images.

A computer program product comprising:

• a computer readable storage medium readable by one or more processor and storing instructions for execution by the one or more processor for performing a method for normalizing a key in a document image comprising:
• identifying a candidate key corresponding to an object in the document image with a key in key ontology data, based on that the candidate key is semantically interchangeable with the key;
• normalizing the candidate key into a normal form;
• deriving one or more alias of the candidate key from the normal form, wherein the one or more alias is not associated with the key in a semantic database;
• assessing respective confidence score for each of the one or more alias, wherein the confidence score indicates a likelihood of each alias being representative of the candidate key, based on document metadata of the document image;
• and
• updating the semantic database with the one or more alias, based on verifying the one or more alias according to a preconfigured manner of verification, such that the one or more alias may be efficiently associated with a text from other document images, based on that the text semantically matches with the candidate key.

A system comprising:

• a memory;
• one or more processor in communication with memory;
• and
• program instructions executable by the one or more processor via the memory to perform a method for normalizing a key in a document image comprising:
• obtaining document metadata of the document image, wherein the document metadata include a context, a position, and a style respective to each object appearing in the document image;
• identifying a candidate key corresponding to an object in the document image with a key in key ontology data, based on that the candidate key is semantically interchangeable with the key;
• normalizing the candidate key into a normal form;
• determining a key class corresponding to the normal form, wherein the key class is associated with the key in the key ontology data;
• assessing a confidence score for the key class, wherein the confidence score indicates a likelihood of the key class being representative of the candidate key, based on the document metadata;
• and
• updating a semantic database with the key class, based on verifying the key class according to a preconfigured manner of verification, such that the key class may be efficiently associated with a semantically interchangeable text appearing in other document images.