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Handwriting detector, extractor, and language classifier

專利號
US11176361B2
公開日期
2021-11-16
申請人
Raytheon Company(US MA Waltham)
發(fā)明人
Darrell L. Young; Kevin C. Holley
IPC分類
G06F40/171; G06F40/263; G06K9/00; G06K9/34; G06K9/38; G06K9/62; G06K9/68; G06K9/72
技術領域
language,may,or,in,bounding,be,hardware,features,geometric,image
地域: MA MA Waltham

摘要

Disclosed are methods for handwriting recognition. In some aspects, an image representing a page of a sample document is analyzed to identify a region having indications of handwriting. The region is analyzed to determine frequencies of a plurality of geometric features within the region. The frequencies may be compared to profiles or histograms of known language types, to determine if there are similarities between the frequencies in the sample document relative to those of the known language types. In some aspects, machine learning may be used to characterize the document as a particular language type based on the frequencies of the geometric features.

說明書

FIG. 5 shows blue Arabic handwriting on top of black text.

FIG. 6 illustrates detected regions of images and handwriting in a document according to various embodiments.

FIG. 7 is an example of detected words and phrases used to build the training set.

FIG. 8 illustrates augmented images for the training set.

FIG. 9 lists feature tokens detected in handwriting and used to build n-gram feature vector histograms.

FIG. 10 is a graph showing the document language classification accuracy improved via majority voting.

FIG. 11 illustrates, by way of example, a block diagram of an embodiment of a machine on which one or more of the methods, such as those discussed herein, can be implemented.

FIGS. 12-16 show examples of geometric features that may be detected by one or more of the disclosed embodiments.

FIG. 17 shows example data structures that may be implemented in one or more of the disclosed embodiments.

FIG. 18 is a flowchart of a process 1800 for identifying a handwriting language type.

FIG. 19 shows an example machine learning module 1900 according to some examples of the present disclosure.

FIG. 20 is a flowchart of a process 2000 for identifying a handwriting language type.

權利要求

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