Video Watermarking by Adjusting the Pixel Values and Using Scene Change Detection

Digital video is one of the popular multimedia data exchanged in the internet. Due to its perfectly replicable nature many illegal copies of the original video can be made. Methods are needed to protect copyrights of the owner and prevent illegal copying. A video can also undergo several intentional attacks like frame dropping, averaging, cropping and median filtering and unintentional attacks like addition of noise and compression which can compromise copyright information, thereby denying the authentication. In this paper, the design and implementation of scene based watermarking where extraction will be a blind method, is proposed. The developed method embeds 8 bit-plane images, obtained from single gray scale watermark image, into different scenes of a video sequence. In this algorithm, some of the luminous values in the video pictures are selected and divided into groups, and the watermark bits are embedded by adjusting the relative relationship of the member in each group. A sufficient number of watermark bits will be embedded into the video pictures without causing noticeable distortion. The watermark will be correctly retrieved at the extraction stage, even after various types of video manipulation and other signal processing attacks.