Load-based Dynamic Backoff Algorithm in Contention-based Wireless Shared Medium
Yoo Byoung-Seok, Choi Hyun-Jun, Young-Ho Seo, Dong-Wook Kim · 2005
The necessity for a technique to protect intellectual property of a digital content has been increasing, especially for the image/video contents which are the most favorite because of their high information-intensive property. According to this demand, this paper proposed a digital watermarking algorithm, which is recognized as the most promising technique. This algorithm targets MPEG compression system and the watermarking process is to be performed during the compression process. It inserts watermark only in Y components of I-frames. Experimental results showed that the proposed method satisfied both imperceptibility and robustness against various attacks. The PSNR difference between the compressed images(the average compression ratio was about 27:1 with Y:Cb:Cr=4:2:0 color format for TM5-based compression) with and without watermarking was only 1.8dB (). In each case that the resulting image after an attack was reusable the normalized correlation between the extracted watermark and the original one was above 0.8.