Quality Scalability Aware Watermarking for Visual Content

Semifragile watermarking for authenticating JPEG visual content

In this paper, we propose a semi-fragile watermarking technique that accepts JPEG lossy compression on the watermarked image to a pre-determined quality factor, and rejects malicious attacks. The authenticator can identify the positions of corrupted blocks, and recover them with approximation of the original ones. In addition to JPEG compression, adjustments of the brightness of the image withi...

Interactive Content-aware Video Streaming System with Fine Granularity Scalability

Video streaming with varying transmission bandwidth is becoming increasingly important. In this paper, an interactive video streaming system is proposed. Fine Granularity Scalability (FGS) is applied to be the streaming video format. The computational complexity of FGS coding is analyzed to explore an efficient FGS implementation. A new transmission model is proposed for the realization of a co...

Semi-Fragile Watermarking for Authenti ating JPEG Visual Content

Quality-aware visual data analysis

The quality, certainty, or confidence of decisions made during the visual analytics process depends on many factors, including the completeness and reliability of the initial data, information loss due to filtering, sampling, and other transformations, and the accuracy and clarity of the visual presentation. Unfortunately, in most visualization tools the analyst is unaware of these and other fo...

3D Watermarking Technology: Visual Quality Aspects

In these last years the applications involving 3D data are quickly increasing in number and many efforts to obtain 3D models by direct acquisition or modeling have been deployed. Additionally, the computer graphics power reached by personal computers and Internet have incremented the diffusion of this new media. For these reasons, the interest in developing techniques to provide IPR protection ...