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Yadong Mu

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Proceedings Article | 3 March 2014 Paper

Text vectorization based on character recognition and character stroke modeling

Zhigang Fan, Bingfeng Zhou, Francis Tse, Yadong Mu, Tao He

Proceedings Volume 9027, 902707 (2014) https://doi.org/10.1117/12.2045596

KEYWORDS: Optical character recognition, Raster graphics, Detection and tracking algorithms, Image quality, Visualization, Digital cameras, Scanners, Mobile devices, Image quality standards, Multimedia

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In this paper, a text vectorization method is proposed using OCR (Optical Character Recognition) and character stroke modeling. This is based on the observation that for a particular character, its font glyphs may have different shapes, but often share same stroke structures. Like many other methods, the proposed algorithm contains two procedures, dominant point determination and data fitting. The first one partitions the outlines into segments and second one fits a curve to each segment. In the proposed method, the dominant points are classified as “major” (specifying stroke structures) and “minor” (specifying serif shapes). A set of rules (parameters) are determined offline specifying for each character the number of major and minor dominant points and for each dominant point the detection and fitting parameters (projection directions, boundary conditions and smoothness). For minor points, multiple sets of parameters could be used for different fonts. During operation, OCR is performed and the parameters associated with the recognized character are selected. Both major and minor dominant points are detected as a maximization process as specified by the parameter set. For minor points, an additional step could be performed to test the competing hypothesis and detect degenerated cases.

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