Highly Secured and Distortionless Video Watermarking using DCT and DWT Transforms
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“Watermarking” is the process of computer-aided information hiding in a carrier signal. Digital watermarks may be used to verify the authenticity or integrity of the carrier signal. In video watermarking, the watermark can be added either to uncompressed data or compressed video streams. Practical video storage and distribution systems store and transmit the video sequences in compressed format, such as using a video on demand (VoD) service to avoid the process of fully decoding and encoding. Most video watermarking applications require the watermark to be embedded and detected in real time. Video watermarking scheme should be robust to geometric distortions, including rotation with cropping, scaling, aspect ratio change, frame dropping, and swapping. Both the Real-time performance and resistance to geometric distortions are important requirements. Discrete Wavelet Transform is invariant to rotation, scaling, and other geometric distortions and Discrete Cosine Transform coefficients Which are subsequently used to construct one-level DWT. This reduces the computational cost and meet the real-time requirement. An additional encryption and decryption keys were used to enhance the security without affecting the quality of video is proposed.