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The video watermarking container - efficient real - time transaction watermarking
Security, forensics, stegonagraphy, and watermarking of multimedia contents X
Bellingham, WA: SPIE, 2008 (Proceedings of SPIE 6819)
|Security, Steganography, and Watermarking of Multimedia Contents Conference <10, 2010, San Jose>|
| Conference Paper|
|Fraunhofer SIT ()|
When transaction watermarking is used to secure sales in online shops by embedding transaction specific watermarks, the major challenge is embedding efficiency: Maximum speed by minimal workload. This is true for all types of media. Video transaction watermarking presents a double challenge. Video files not only are larger than for example music files of the same playback time. In addition, video watermarking algorithms have a higher complexity than algorithms for other types of media. Therefore online shops that want to protect their videos by transaction watermarking are faced with the problem that their servers need to work harder and longer for every sold medium in comparison to audio sales. In the past, many algorithms responded to this challenge by reducing their complexity. But this usually results in a loss of either robustness or transparency. This paper presents a different approach. The container technology separates watermark embedding into two stages: A pre parationstage and the finalization stage. In the preparation stage, the video is divided into embedding segments. For each segment one copy marked with "O" and anther one marked with "1" is created. This stage is computationally expensive but only needs to be done once. In the finalization stage, the watermarked video is assembled from the embedding segments according to the watermark message. This stage is very fast and involves no complex computations. It thus allows efficient creation of individually watermarked video files.