NDLI: Text localization based on the Discrete Shearlet Transform

Content Provider	IEEE Xplore Digital Library
Author	Jiuwen Zhang Yaohua Chong
Copyright Year	2013
Description	Author affiliation: Dept. of Inf. Sci. & Eng., Univ. of Lanzhou, Lanzhou, China (Jiuwen Zhang; Yaohua Chong)
Abstract	This paper proposes a new method to locate the text regions from images with complex background based on the Discrete Shearlet Transform. Text localization is an important step of text extraction to obtain the useful information from images. It is now widely acknowledged that traditional wavelets are not very effective in dealing with multi-dimensional signals containing distributed discontinuities. Shearlets not only possess the main features of wavelets such as multi-scale, multi-direction and time-frequency localization, but also offers a high degree of directionality and anisotropy. Meanwhile, compared with Nonsubsampled Contourlet Transform (NSCT), Shearlets has obvious superiority in flexibility on directional selectivity and lower computing complexity. The proposed method applies the Discrete Shearlet Transform on an image to decompose it into set of directional subbands with texture details captured in different orientations and scales. Then, the binarization with dynamic thresholding is applied to these subbands so as to filter out the background and recognize the edges in multiple directions. Morphological operations are carried out on these binary images and connect the edges together in these images. At each scale, text regions are obtained with the help of the logical AND operator on all binary subband images; and the final text regions are achieved through voting-decision among different scales. This method of text localization is applied on different samples of images and the experiment results have a good performance.
Starting Page	262
Ending Page	266
File Size	969960
Page Count	5
File Format	PDF
ISBN	9781467349970
ISSN	23270594
e-ISBN	9781467350006
DOI	10.1109/ICSESS.2013.6615301
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-23
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image segmentation Text localization Image recognition Text recognition Shearlets Discrete wavelet transforms Morphological operation Voting-decision Dynamic thresholding
Content Type	Text
Resource Type	Article

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