C. Cruz–Ramos, R. Reyes–Reyes, M. Nakano–Miyatake*, H. Perez–Meana
D Mechanical and Engineering School, Culhuacan Campus, National Polytechnic Institute, Av. Santa Ana no. 1000, Col. San Francisco Culhuacan, 04430 Mexico City, Mexico. *E–mail: mnakano@ipn.mx
ABSTRACT
In this paper, we propose a robust digital video watermarking scheme with completely blind extraction process where the original video data, original watermark or any other information derivative of them are not required in order to retrieve the embedded watermark. The proposed algorithm embeds 2D binary visually recognizable patterns such as company trademarks and owner's logotype, etc., in the DWT domain of the video frames for copyright protection. Before the embedding process, only two numerical keys are required to transform the watermark data into a noise–like pattern using the chaotic mixing method which helps to increase the security. The main advantages of the proposed scheme are its completely blind detection scheme, robustness against common video attacks, combined attacks and its low complexity implementation. The combined attacks consist of MPEG–2 compression and common video attacks such as noise contamination, collusion attacks, frame dropping and swapping. Extensive simulation results also show that the watermark imperceptibility and robustness outperform other previously reported methods. The extracted watermark data from the watermarked video sequences is clear enough even after the watermarked video had suffered from several attacks.
Keywords: Video watermarking, blind detection method, copyright protection, combination attacks, visually recognizable patterns.
]]> RESUMEN
En este artículo se propone un sistema de marca de agua robusto para la protección de derechos de autor en video digital donde el proceso de extracción de la marca de agua es completamente a ciegas, ya que no requiere ninguna información directa o derivada del video original ni de la marca de agua original. El algoritmo inserta patrones binarios bidimensionales reconocibles visualmente, los cuales pueden ser logotipos de compañías o cualquier otra imagen en el dominio de la DWT de algunos cuadros de video seleccionados aleatoriamente. Antes del proceso de inserción, son necesarias únicamente dos llaves para desordenar los datos de la marca de agua mediante el método de mezclas caóticas, con la finalidad de incrementar la seguridad. Las ventajas principales del sistema propuesto son la extracción de la marca de agua es completamente a ciegas, su bajo costo computacional y su desempeño en contra de ataques combinados al video es mejor que otros métodos propuestos por diferentes autores. Resultados obtenidos demuestran la imperceptibilidad de la marca de agua y que la marca de agua extraída es suficientemente distinguible aún después de que la secuencia de video ha sido sometida a diversos ataques combinados.
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