ABSTRACT
Watermarking has received considerable attention lately, as it provides an effective alternative to methods used in the past for the protection of digital data. Experiments are carried to measure the robustness of these detection schemes under various attacks. The detector performance based on the Laplacian distribution is evaluated in Motion Pictures Expert Group video data watermarked with an imperceptible watermark that is added to the quantized discrete cosine transform coefficients. Many watermarking systems are inspired by the spread spectrum modulation schemes used in digital communications in jamming environments. The performances of the conventional Gaussian and the Laplacian detectors are measured in terms of the detection and error probabilities. The proposed quantized Laplacian detector is expected to outperform the conventional Gaussian correlator, as it is based on a more accurate statistical model of the quantized transform domain data. The proposed detector can become part of a reliable and robust video watermarking system in the compressed domain.
