Invention Grant
- Patent Title: Robust character segmentation for license plate images
- Patent Title (中): 车牌图像的强大字符分割
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Application No.: US13539739Application Date: 2012-07-02
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Publication No.: US08934676B2Publication Date: 2015-01-13
- Inventor: Aaron Michael Burry , Claude Fillion , Vladimir Kozitsky
- Applicant: Aaron Michael Burry , Claude Fillion , Vladimir Kozitsky
- Applicant Address: US CT Norwalk
- Assignee: Xerox Corporation
- Current Assignee: Xerox Corporation
- Current Assignee Address: US CT Norwalk
- Agency: Ortiz & Lopez, PLLC
- Agent Luis M. Ortiz; Kermit D. Lopez
- Main IPC: G06K9/00
- IPC: G06K9/00 ; G06K9/48 ; G06K9/03 ; G06K7/10

Abstract:
A method and system for achieving accurate segmentation of characters with respect to a license plate image within a tight bounding box image. A vehicle image can be captured by an image capturing unit and processed utilizing an ALPR unit. A vertical projection histogram can be calculated to produce an initial character boundary (cuts) and local statistical information can be employed to split a large cut and insert a missing character. The cut can be classified as a valid and/or a suspect character and the suspect character can be analyzed. The suspect character can be normalized and passed to an OCR module for decoding and generating a confidence quote with every conclusion. The non-character images can be rejected at the OCR level by enforcing a confidence threshold. An adjoining suspect narrow character can be combined and the OCR confidence of the combined character can be assessed.
Public/Granted literature
- US20130294654A1 ROBUST CHARACTER SEGMENTATION FOR LICENSE PLATE IMAGES Public/Granted day:2013-11-07
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