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Electrical network frequency (ENF) is known to be useful for audio authentication. In a digital archive system, error concealment of the audio files are sometimes required. Firstly, assuming that traditional recordings were produced by AC-powered devices, the ENF is coupled into the recorded signals. Secondly, assuming that damaging and editing produce similar data error patterns, the ENF phase discontinuities...
With the advancement of internet technology and the change in the mode of communication, it is found that much first-hand news have been discussed in Internet forums well before they are reported in traditional mass media. Also, this communication channel provides an effective channel for illegal activities such as dissemination of copyrighted movies, threatening messages and online gambling etc....
Unlike traditional entropy in information theory, this work uses the normalized energy instead of probability to obtain a low-frequency amplitude transform (LAT) on coefficients of discrete wavelet transform (DWT). The watermark is embedded based on the properties and characteristics of this transform. Finally, performance of the proposed scheme is assessed by signal-to-watermark (SWR) and bit error...
Playfield detection is one of important tasks in sports video analysis. Although some encouraging results have been achieved, the robustness of playfield detection still needs to be enhanced. To the best of our knowledge, traditional methods for playfield detection usually using various color features. Detection results are unstable when there are shadows on the playfield. In this paper, an effective...
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