**7. Detection test against adding some noises**

There are some kinds of noise such as Gaussian noise, salt and pepper noise, Poisson noise, etc. In the third attack, we added "salt and pepper" noise with density 0.1 into the watermarked video (**Figure 11a**). When we extracted the watermarks from the video, we got the watermarks also contained noise. The noisy watermarks indicated that the video has been altered (**Figure 11b**). The tampering region is entire of frame (**Figure 11c** and **d**).

**Figure 11.**

*(a) The watermarked frames after adding noise "salt and pepper"; (b) the extracted watermark; (c) and (d) detected tampering region.*
