Digital watermarking consists of hiding subliminal information into digital media content, also
called host data. It can be the basis of many applications, including security and media asset …

Visual quality assessment is an interdisciplinary topic that links image/video processing,
psychology and physiology. Many engineers are familiar with the image/video processing; …

This chapter reviews the history and state of the art of perceptual quality metrics for video. It
discusses the factors influencing our perception of visual quality and proposes a …

In this work we present a new algorithm for digital images unsupervised enhancement with
simultaneous global and local effects, called ACE for Automatic Color Equalization. It is …

Two-dimensional wavelets offer a number of advantages over discrete wavelet transforms
when processing rapidly varying functions and signals. In particular, they offer benefits for …

Lossy compression algorithms used in digital video systems produce artifacts whose
visibility strongly depends on the actual image content. Simple error measures such as …

We present a perceptual model for hiding a spread-spectrum watermark of variable
amplitude and density in an image. The model takes into account the sensitivity and …

Visual responses are known to depend on stimulus contrast and not simply on the absolute
levels of retinal illumination. Here, we have determined the contrasts that mammalian retinal …

Perceptual approaches have been widely used in many areas of visual information
processing. This paper presents an overview of perceptual based approaches for image …

In this paper, we propose an efficient algorithm for the measure of contrast in digital images.
It applies locally, at various sub-sampled levels, a simplified computation of local contrast …