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Localizing and Segmenting Text in Images and Videos
Lienhart, Rainer
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Wernicke, Axel
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Dokumenttyp:
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Zeitschriftenartikel
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Erscheinungsjahr:
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2002
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Titel einer Zeitschrift oder einer Reihe:
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IEEE Transactions on Circuits and Systems for Video Technology
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Band/Volume:
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12
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Heft/Issue:
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4
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Seitenbereich:
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256-258
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Ort der Veröffentlichung:
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New York, NY
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Verlag:
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IEEE
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ISSN:
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1051-8215
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Sprache der Veröffentlichung:
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Englisch
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Einrichtung:
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Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik > Praktische Informatik IV (Effelsberg 1989-2017)
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Fachgebiet:
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004 Informatik
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Abstract:
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Many images especially those used for page design on web pages as well as videos contain visible text. If these text occurrences could be detected, segmented, and recognized auto-matically, they would be a valuable source of high-level seman-tics for indexing and retrieval. In this paper, we propose a novel method for localizing and segmenting text in complex images and videos. Text lines are identified by using a complex-valued multi-layer feed-forward network trained to detect text at a fixed scale and position. The network s output at all scales and positions is in-tegrated into a single text-saliency map, serving as a starting point for candidate text lines. In the case of video, these candidate text lines are refined by exploiting the temporal redundancy of text in video. Localized text lines are then scaled to a fixed height of 100 pixels and segmented into a binary image with black characters on white background. For videos, temporal redundancy is exploited to improve segmentation performance. Input images and videos can be of any size due to a true multiresolution approach. Moreover, the system is not only able to locate and segment text occurrences into large binary images, but is also able to track each text line with sub-pixel accuracy over the entire occurrence in a video, so that one text bitmap is created for all instances of that text line. Therefore, our text segmentation results can also be used for ob-ject- based video encoding such as that enabled by MPEG-4.
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