Recognizer of text-based work

Abstract

Described herein is a technology for recognizing the content of text documents. The technology determines one or more hash values for the content of a text document. Alternatively, the technology may generate a “sifted text” version of a document. In one implementation described herein, document recognition is used to determine whether the content of one document is copied (i.e., plagiarized) from another document. This is done by comparing hash values of documents (or alternatively their sifted text). In another implementation described herein, document recognition is used to categorize the content of a document so that it may be grouped with other documents in the same category. This abstract itself is not intended to limit the scope of this patent. The scope of the present invention is pointed out in the appending claims.

1 . A method for facilitating recognition of content of a body of text, the method comprising: 
 filtering the content a body of text to remove elements of the content;    determining a recognition representation of the content of such body based upon the filtered subtext.    
     
     
         2 . A method as recited in  claim 1 , wherein the filtering is text-sifting.  
     
     
         3 . A method as recited in  claim 1 , wherein the determining comprises calculating the recognition representation as a hash value that identifies the content in the body.  
     
     
         4 . A method as recited in  claim 1 , wherein the determining comprises calculating the recognition representation as a hash value that is proximally similar to other bodies of text having similar semantic content.  
     
     
         5 . A method as recited in  claim 1 , wherein the filtering comprises removing superfluous elements from the content of the body.  
     
     
         6 . A computer comprising one or more computer-readable media having computer-executable instructions that, when executed by the computer, perform the method as recited in  claim 1 .  
     
     
         7 . One or more computer-readable media having computer-executable instructions that, when executed by a computer, performs the method as recited in  claim 1 .  
     
     
         8 . A method for facilitating recognition of content of a body of text, the method comprising: 
 obtaining a body of text;    determining a self-synchronized recognition representation of the content of such body.    
     
     
         9 . A method as recited in  claim 8 , wherein the self-synchronized recognition representation is derived from a subset of the content of the body of text.  
     
     
         10 . A method as recited in  claim 8 , wherein the self-synchronized recognition representation is derived from a subset of the content of the body of text, the subset excludes superfluous elements of the content of the body of text.  
     
     
         11 . A method as recited in  claim 8 , wherein the self-synchronized recognition representation is derived from a subset of the content of the body of text.  
     
     
         12 . One or more computer-readable media having computer-executable instructions that, when executed by a computer, performs the method as recited in  claim 8 .  
     
     
         13 . A computer comprising one or more computer-readable media having computer-executable instructions that, when executed by the computer, perform the method as recited in  claim 8 .  
     
     
         14 . A method for facilitating recognition of content of a body of text, the method comprising: 
 filtering the content of a body of text to select a subset of content of such body;    determining a recognition representation of the content of such body based upon the selected subtext.    
     
     
         15 . A method as recited in  claim 14 , wherein the filtering is text-sifting.  
     
     
         16 . A method as recited in  claim 14  further comprising storing the recognition representation in a database, the recognition representation being associated with the body of text from which it was determined.  
     
     
         17 . A method as recited in  claim 14 , wherein the determining comprises calculating the recognition representation as a hash value that identifies the content in the body.  
     
     
         18 . A method as recited in  claim 14 , wherein the determining comprises calculating the recognition representation as a hash value that is proximally similar to other bodies of text having similar semantic content.  
     
     
         19 . A method as recited in  claim 14 , wherein the filtering comprises removing elements from the content of the body.  
     
     
         20 . A method as recited in  claim 14 , wherein the filtering comprises removing superfluous elements from the content of the body.  
     
     
         21 . A method as recited in  claim 14 , wherein the filtering comprises removing elements from the content of the body, wherein at least some of the elements removed are associated with a format of the content of the body.  
     
     
         22 . A method as recited in  claim 19 , wherein the removing comprises: 
 converting white space in the body of text into single spaces;    purging all content of the body of text that is not letters or spaces;    converting all content of the body of text into one form of capitalization.    
     
     
         23 . A method as recited in  claim 19 , wherein the removing comprises: 
 referencing a list of common words;    purging all words from the body of text that are on the list of common words.    
     
     
         24 . A method as recited in  claim 14 , wherein the filtering comprises cryptographically extracting the subset of text of such body.  
     
     
         25 . A method as recited in  claim 14 , wherein the subset has a fixed size that is independent of size of the subset's body of text.  
     
     
         26 . A method as recited in  claim 14 , wherein the subset has a variable size that is dependent upon size of the subset's body of text.  
     
     
         27 . A method as recited in  claim 14 , wherein the filtering comprises: 
 removing superfluous elements from the content of the body to produce filtered text;    cryptographically extracting the subset of text of such body from the filtered text.    
     
     
         28 . A method as recited in  claim 14  further comprising comparing recognition representations of text of at least two bodies of text.  
     
     
         29 . A method as recited in  claim 28  further comprising indicating a match if recognition representations of text of at least two bodies of text substantially match.  
     
     
         30 . A method as recited in  claim 14  further comprising: 
 comparing recognition representation of text of a body of text with recognition representations of text of a group of bodies;  
 grouping the body with the group if all compared recognition representations are proximally similar.  
 
     
     
         31 . A computer comprising one or more computer-readable media having computer-executable instructions that, when executed by the computer, perform the method as recited in  claim 14 .  
     
     
         32 . One or more computer-readable media having computer-executable instructions that, when executed by a computer, performs the method as recited in  claim 14 .  
     
     
         33 . A method for facilitating detection of textual similarity, the method comprising: 
 comparing recognition representations of text of at least two bodies of text, wherein such recognition representations are computed by: 
 text sifting text of the bodies of text to select a subset of text for each body;  
 determining such recognition representation of the text for each body based upon the selected subtext of each body;  
   indicating a match if recognition representations of the text of at least two of the bodies substantially match.    
     
     
         34 . A method as recited in  claim 33 , wherein the determining comprises calculating the recognition representation as a hash value that identifies the content of the body.  
     
     
         35 . A method as recited in  claim 33 , wherein the text sifting comprises cryptographically extracting the subset of text of such body.  
     
     
         36 . A method as recited in  claim 33 , wherein the text sifting comprises: 
 removing superfluous elements from the text of a body to produce filtered text;    cryptographically extracting the subset of text of such body from the filtered text.    
     
     
         37 . A computer comprising one or more computer-readable media having computer-executable instructions that, when executed by the computer, perform the method as recited in  claim 33 .  
     
     
         38 . One or more computer-readable media having computer-executable instructions that, when executed by a computer, performs the method as recited in  claim 33 .  
     
     
         39 . A method of manipulating content of a source body of text, the method comprising: 
 obtaining a source body of text;    generating content of a target body of text by deriving the content of the target body from the source body;    wherein the content of the target body has a self-synchronized recognition representation that does not substantially match a self-synchronized recognition representation of the content of the source body.    
     
     
         40 . A method as recited in  claim 39 , wherein the content of the target body has a self-synchronized recognition representation that does not match a self-synchronized recognition representation of the content of the source body.  
     
     
         41 . A method as recited in  claim 39 , wherein the self-synchronized recognition representations are determined by producing a hash value of a subset of the content of a body, wherein the subset excludes superfluous elements.  
     
     
         42 . A text recognition system, comprising: 
 text retriever for obtaining body of text;    text sifter for selecting a subset of text of such body;    recognition representation determiner for determining a recognition representation of the text of such body based upon the selected subtext.    
     
     
         43 . A system as recited in  claim 42  further comprising a database for storing the recognition representation in association with the body of text from which it was determined.  
     
     
         44 . A system as recited in  claim 42 , wherein the determiner comprises a calculator to calculate the recognition representation as a hash value that identifies the content of the body.  
     
     
         45 . A system as recited in  claim 42 , wherein the determiner comprises a calculator to calculate the recognition representation as a hash value that is proximally similar to other bodies of text having similar semantic content.  
     
     
         46 . A system as recited in  claim 42 , wherein the text sifter comprises a extractor for cryptographically extracting the subset of text of such body.  
     
     
         47 . A system as recited in  claim 42  further comprising a comparator for comparing recognition representations of text of at least two bodies of text.  
     
     
         48 . A system as recited in  claim 42  further comprising: 
 a comparator for comparing recognition representations of text of at least two bodies of text;  
 an indicator for indicating a match if recognition representations of text of at least two bodies of text substantially match.  
 
     
     
         49 . A system as recited in  claim 42  further comprising: 
 a comparator for comparing recognition representation of text of a body of text with recognition representations of text of a group of bodies;  
 a categorizer for grouping the body with the group if all compared recognition representations are proximally similar.  
 
     
     
         50 . One or more computer-readable media having stored thereon a data structure, comprising an library containing bodies of text where at least one body is associated with a recognition representation determined by the system as recited in  claim 42 .  
     
     
         51 . One or more computer-readable media having stored thereon a data structure, comprising: 
 a first data field containing a body of text;    a second data field derived from the first field by text sifting the text of such body to select a subset of text of such body and determining a recognition representation of the text of such body based upon the selected subtext;    a third data field functioning to delimit the end of the data structure.    
     
     
         52 . One or more computer-readable media having computer-executable instructions that, when executed by a computer, performs the method comprising: 
 obtaining a body of text;    text sifting the text of such body to select a subset of text of such body;    determining a recognition representation of the text of such body based upon the selected subtext.