Perceptual Encryption is required in many of the multimedia content preview application.
There is always a need of an efficient technique that reduces the overhead of encryption in …

A general method for recovering missing DCT coefficients in DCT-transformed images is
presented in this work. We model the DCT coefficients recovery problem as an optimization …

Motivated by the work of Uehara et al.[1], an improved method to recover DC coefficients
from AC coefficients of DCT-transformed images is investigated in this work, which finds …

Discrete cosine transform is exploited in this work to generate the authentication data that
are treated as a fragile watermark. This watermark is embedded in the motion vectors. The …

This chapter addresses the emerging security issues by providing a state of the art of partial,
perceptual and selective encryption approaches. It presents recent work in the field of video …

Video data security is one of the most research topic in the recent years. It is widely used in
the multimedia applications such as video-conferencing, Video on Demand and Pay-TV …

In conventional image trading systems, images are usually stored unprotected on a server,
rendering them vulnerable to untrusted server providers and malicious intruders. This paper …

This paper presents a content-based image retrieval mechanism for visually protected
image databases. Visual protection is provided as a means to prevent illegal use of a …

Digital images and videos are so ubiquitous nowadays that it would be difficult to live without
them in the heavily digitized and networked world. Various digital devices, such as digital …

Digital watermarking was commenced to copyright protection and ownership verification of
multimedia data. However the evolution of the watermark focused on different security …