Fragile video watermarking for tampering detection and localization

Authentication is required to decide the originality of video signal. In this paper we proposed effective fragile video watermarking technique to embed and extract watermark in DCT domain with high capacity and transparency. Two watermarks are embedded into each frame. The first watermark is bits of the digital signature of hash value of the frame in frequency domain and second watermark is bits of micro-block numbers and frame numbers. The watermarks are embedded into video frames one by one in highest non-zero coefficient of quantized DCT coefficient. The first watermark is used to detect tampering and second watermark is used to localize the area being tampered. This technique causes significantly smaller video distortion as bits are embedded into the highest frequency coefficients. The embedded watermark is extracted and verified using public key. The block numbers and frame numbers are inserted in order to detect intra-frame and inter-frame tampering such as addition or removal of content within frames, frame reordering, dropping or addition of extra frames. If the video is being tampered we may extract one watermark correctly but other may get destroyed. As a result tamper detection of watermarked digital video will proved to be more authentic.