Raw speech watermarking for compressed video

A method for embedding raw speech as a watermark signal into a compressed sequence of images is proposed. The idea of using raw speech as a watermark to enhance the robustness of the embedded watermark arises from the fact that raw speech contains a considerable amount of redundancies, and the bit content can still be recognized after the retrieval process, even if the watermarked data was badly attacked. As long as the raw speech, extracted from the attacked watermarked image frame, contains enough important information, its contents can still be intelligible. In the experiments, raw speech was embedded into an MPEG coded video stream, then attacks were simulated. After the embedded speech was extracted, a listening test was performed to evaluate the intelligibility of the extracted speech. The human perceptual system, as it tends to adjust and learn quickly to recognize the repeated speech, enhances the probability of recognizing the contents of the extracted raw speech precisely. The experimental results showed that our method successfully survives most common attacks