IEEE Transactions on Pattern Analysis and Machine Intelligence
Character extraction of license plates from video
CVPR '97 Proceedings of the 1997 Conference on Computer Vision and Pattern Recognition (CVPR '97)
Improvement of Video Text Recognition by Character Selection
ICDAR '01 Proceedings of the Sixth International Conference on Document Analysis and Recognition
Videotext OCR Using Hidden Markov Models
ICDAR '01 Proceedings of the Sixth International Conference on Document Analysis and Recognition
Information-Conserving Object Recognition
ICCV '98 Proceedings of the Sixth International Conference on Computer Vision
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In this paper, an approach to detection of caption text invideo frames is described. Text recognition in video can beapplied to various applications, however there are stillproblematic issues such as insufficient resolution,complexity of layouts and backgrounds. This study attemptsto solve these problems with a segmentation-free approach,called MAP matching method. Besides extending the methodto grayscale images, a strategy for character size variationusing Gaussian filtering and multi-sized reference patternsis discussed, as well as a method for detecting framescontaining caption text. Results show the proposed matchingmethod is able to detect characters of unknown size incaption text. Although over-detection is not negligible,verifying the positions of detected characters can identifythe location of keywords with practical precision. It is alsoshown that the frames containing caption text are detectedwith nearly 98% accuracy.