Turbo Coding Protection of Compressed Domain Watermarking Channel
The aim of compression in general is to reduce information spatial and temporal redundancy from the data. From a watermarking point of view, it reduces the watermark insertion space and power of the embedded signal. This paper describes a watermarking scheme based on the spread spectrum paradigm with capacity enhancement using a state-of-the-art error correction technique - turbo coding. A new watermark composition with random spreading of watermarking bits through the video frames, amplitude adjustment in DCT domain and bit-rate preserving is proposed. However, it was essential to introduce an error correction technique in order to achieve reasonable capacity levels and robustness. In addition, experimental results on perceptibility and robustness on transcoding are presented