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CEDAR-FOX
This is a software system for forensic comparison of handwriting. It was developed at CEDAR, the Center of Excellence for Document Analysis and Recognition at the University at Buffalo.〔〔〔 CEDAR-FOX has capabilities for interaction with the questioned document examiner to go through processing steps such as extracting regions of interest from a scanned document, determining lines and words of text, recognize textual elements. The final goal is to compare two samples of writing to determine the log-likelihood ratio under the prosecution and defense hypotheses. It can also be used to compare signature samples. The software, which is protected by a United States Patent 〔S. N. Srihari, et.al, (Method and Apparatus for analyzing and/or comparing handwritten or Biometric Samples ), United States patent No. 7,580,551, Aug 29,2009.〕 can be licensed from Cedartech, Inc.
== Details ==
Writer verification is the task to determine whether two handwritten samples are written by the same writer or not. It is used in questioned document examiner. By using a set of metrics, CedarFox can associate a measure of confidence whether two documents are written by the same individual or by different individuals. CedarFox allows you to select either the entire document or a specific region of a document in order to obtain the comparison. The comparison is based on macro features (which measure global characteristics such as slant, connectivity, etc.), micro features (which are based on individual character shapes), and style features (e.g., shapes of character pairs, or bigrams). Two different modes of writer verification are available: (i) a questioned document is compared against a single known document (the basis of this comparison are statistics based on how much variation a person can have), and (ii) a questioned document is compared against "multiple known" documents. Here the system learns from the known documents about the writer's habits. At least four known documents have to be available to use this mode. The task of identifying the user is split into two parts,
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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