A computer-implemented method for the identification and interpretation of text captions in an encoded video stream of digital video signals comprises sampling by selecting frames for video analysis, decoding by converting each of frames selected into a digitized color image, performing edge detection...http://www.google.de/patents/US6101274?utm_source=gb-gplus-sharePatent US6101274 - Method and apparatus for detecting and interpreting textual captions in digital video signals
