Résumé:
This work provides a comprehensive overview of quality assessment and security techniques
in multimedia systems. It begins by analyzing the factors that affect image quality, such as
degradation, noise, and compression artifacts, and discusses both subjective and objective
methods for quality evaluation. It then explores multimedia security mechanisms, including
digital watermarking, cryptography, and steganography, emphasizing their roles in protecting
content integrity, authenticity, and ownership. Additionally, the study addresses propagation
channel characterization and advanced transmission strategies, such as MIMO systems and
joint source-channel coding, which enhance multimedia delivery in complex network
environments. The overall objective is to present an integrated understanding of how to
preserve and secure multimedia data from acquisition to transmission.
