tailieunhanh - Báo cáo hóa học: " Video Waterscrambling: Towards a Video Protection Scheme Based on the Disturbance of Motion Vectors Yann Bodo"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Video Waterscrambling: Towards a Video Protection Scheme Based on the Disturbance of Motion Vectors Yann Bodo | EURASIP Journal on Applied Signal Processing 2004 14 2224-2237 2004 Hindawi Publishing Corporation Video Waterscrambling Towards a Video Protection Scheme Based on the Disturbance of Motion Vectors Yann Bodo TECH IRIS CIM France Telecom R D 4 rue du Clos Courtel 35512 Cesson Sévigne Cedex France Email Nathalie Laurent TECH IRIS CIM France Telecom R D 4 rue du Clos Courtel 35512 Cesson Sévigne Cedex France Email Christophe Laurent TECH IRIS CIM France Telecom R D 4 rue du Clos Courtel 35512 Cesson Sévigne Cedex France Email Jean-Luc Dugelay Multimedia Communication Department Institut EURECOM 2229 Route des Cretes BP 193 06904 Sophia-Antipolis Cedex France Email Received 31 March 2003 Revised 19 December 2003 With the popularity of high-bandwidth modems and peer-to-peer networks the contents of videos must be highly protected from piracy. Traditionally the models utilized to protect this kind of content are scrambling and watermarking. While the former protects the content against eavesdropping a priori protection the latter aims at providing a protection against illegal mass distribution a posteriori protection . Today researchers agree that both models must be used conjointly to reach a sufficient level of security. However scrambling works generally by encryption resulting in an unintelligible content for the end-user. At the moment some applications such as e-commerce may require a slight degradation of content so that the user has an idea of the content before buying it. In this paper we propose a new video protection model called waterscrambling whose aim is to give such a quality degradation-based security model. This model works in the compressed domain and disturbs the motion vectors degrading the video quality. It also allows embedding of a classical invisible watermark enabling protection against mass distribution. In fact our model .