Comparative evaluation of video watermarking techniques in the uncompressed domain

[摘要] ENGLISH ABSTRACT: Electronic watermarking is a method whereby information can be imperceptiblyembedded into electronic media, while ideally being robust against common signalmanipulations and intentional attacks to remove the embedded watermark. Thisstudy evaluates the characteristics of uncompressed video watermarking techniquesin terms of visual characteristics, computational complexity and robustness againstattacks and signal manipulations.The foundations of video watermarking are reviewed, followed by a survey ofexisting video watermarking techniques. Representative techniques from differentwatermarking categories are identified, implemented and evaluated.Existing image quality metrics are reviewed and extended to improve their performancewhen comparing these video watermarking techniques. A new metric forthe evaluation of inter frame flicker in video sequences is then developed.A technique for possibly improving the robustness of the implemented discreteFourier transform technique against rotation is then proposed. It is also shown thatit is possible to reduce the computational complexity of watermarking techniqueswithout affecting the quality of the original content, through a modified watermarkembedding method.Possible future studies are then recommended with regards to further improvingwatermarking techniques against rotation.

[发布机构] Stellenbosch University