Communications of the ACM
Video OCR: indexing digital new libraries by recognition of superimposed captions
Multimedia Systems - Special section on video libraries
Automatic text detection and tracking in digital video
IEEE Transactions on Image Processing
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Automatic recognition of time and date stamps in CCTV video enables the inclusion of time-based queries in video indexing applications. Such ability needs to deal with problems of low character resolution, non-uniform background, multiplexed video format, and random access to the video file. In this paper, we address these problems and propose a technique that solves the difficult task of character segmentation, by means of a recognition-based process. Our method consists of three main steps: pattern matching, character location and syntactic analysis. The experiments prove the reliability and efficiency of the proposed method, obtaining an overall recognition rate over 80%.