Watermarking requirement for QoS adaptive transcoding

In ubiquitous environment, seamless video consumption requires content adaptation technologies to satisfy QoS (quality of service). But video transcoding that is one of the content adaptations would distort the watermark signal embedded in the video content. In this paper, we analyze the effect of video transcoding for frequency based watermarking and propose watermarking requirement to keep watermark even after video transcoding. Experiments were performed with widely used watermark algorithms to verify that the proposed watermarking requirement is useful.