Publications by Touradj Ebrahimi

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Universal Multimedia Access (UMA) refers to the ability to access by any user to the desired multimedia content(s) over any type of network with any device from anywhere and anytime. UMA is a key framework for multimedia content delivery service using metadata. This investigation report analyzes the state-of-the-art technologies in UMA and tries to identify the key issues of UMA. The state-of-the-art in multimedia content adaptation, an overview of the standards that supports the UMA framework, potential pr

Many privacy protection tools have been proposed for preserving privacy. Tools for protection of visual privacy available today lack either all or some of the important properties that are expected from such tools. Therefore, in this paper, we propose a si ...

We present a novel technique for efficient coding of texture to be mapped on 3D landscapes. It enables the streaming of texture information across bi-directional networks like the Internet. The algorithm can be used with many transform based coding schemes. Results are presented using MPEG-4 video encoder

An increase in adoption of video surveillance, affecting many aspects of daily lives, raises public concern about an intrusion into individual privacy. New sensing and surveillance technologies, such as mini-drones, threaten to eradicate boundaries of priv ...

The growing requirements for broadcasting and streaming of high quality video continue to trigger demands for codecs with higher compression efficiency. AV1 is the most recent open and royalty free video coding specification developed by Alliance for Open ...

The widespread usage of digital video surveillance systems has increased the concerns for privacy violation. Since video surveillance systems are invasive, it is a challenge to find an acceptable balance between privacy of the public under surveillance and ...

Noise is an intrinsic part of any sensor and is present, in various degrees, in any content that has been captured in real life environments. In imaging applications, several pre- and post-processing solutions have been proposed to cope with noise in captu ...

In this paper, we propose an automatic method for the objective evaluation of segmentation results. The method is based on computing the deviation of the segmentation results from a reference segmentation. The discrepancy between two results is weighted based on spatial and temporal contextual information, by taking into account the way humans perceive visual information. The metric is useful for applications where the final judge of the quality is a human observer or the results of segmentation are otherwi

In recent years, we have observed the advent of plenoptic modalities such as light fi elds, point clouds and holography in many devices and applications. Besides plenty of technical challenges brought by these new modalities, a particular challenge is aris ...

Recent advances in image compression have made it both possible and desirable for image quality to approach the visually lossless range. However, the most commonly used subjective visual quality assessment protocols, e.g. those reported in ITU-T Rec. BT.50 ...

Advertisement heavily relies on compelling visuals to engage audiences across sectors. Recent advances in AIdriven text-to-image generation, particularly diffusion models like Stable Diffusion, offer novel opportunities for hyper-personalized and context-aware advertising content. However, challenges remain in precise control over image composition, segmentation robustness, and semantic consistency. In this work, we enhance the state-of-the-art Anywhere-Multi-Agent framework by replacing the original RMBG s

The need for efficient, widespread and reliable security and user privacy technologies is important more so than ever before. This is in particular crucial for workflows involving image data. Images can be easily edited to give a false impression of realit ...

The use of point clouds to digitally represent three-dimensional objects with both geometry and color attributes is rapidly increasing in several applications. Since storage and transmission of uncompressed point cloud data are often impractical, several l ...

Automatic prediction of salient regions in images is a well developed topic in the field of computer vision. Yet, virtual reality omnidirectional visual content brings new challenges to this topic, due to a different representation of visual information an ...

In this paper, a scheme based on multiview and Distributed Video Coding (DVC) is introduced. More specifically, a new fusion technique between temporal, homography and Disparity Compensation View Prediction (DCVP) side informations is introduced. For this ...

We present a multimodal dataset for the analysis of human affective states. The electroencephalogram (EEG) and peripheral physiological signals of 32 participants were recorded as each watched 40 one-minute long excerpts of music videos. Participants rated ...

The problem of objectively measuring perceptual quality of omnidirectional visual content arises in many immersive imaging applications and particularly in compression. The interactive nature of this type of content limits the performance of earlier method ...

In this paper, we consider the evaluation of graph-based object duplicate detection. Several applications require accurate and efficient object duplicate detection methods, such as automatic video and image tag propagation, video surveillance, and high lev ...

This paper proposes a method to embed information into a 3D model represented by a polygonal mesh. The approach used consists in slightly changing the position of the vertices, in uencing the length of approximation of the normals to the surface. This technique exhibits relatively low complexity, and o ers robustness to simple geometric tranformations. In addition, it does not introduce any visible distortion to the original model.

Since olfactory sense is gaining ground in multimedia applications, it is important to understand the way odor pleasantness is perceived. Although several studies have explored the way odor pleasantness perception influences the power spectral density of t ...

Touradj Ebrahimi

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Investigation Report on Universal Multimedia Access

Using False Colors to Protect Visual Privacy of Sensitive Content

View-dependent texture coding using the MPEG-4 video coding scheme

Impact of Mini-drone based Video Surveillance on Invasion of Privacy

Comparison of Compression Efficiency between HEVC/H.265, VP9 and AV1 based on Subjective Quality Assessments

Towards optimal distortion-based visual privacy filters

On combining denoising with learning-based image decoding

Objective evaluation of segmentation quality using spatio-temporal context

JPEG Pleno: a standard framework for representing and signalling plenoptic modalities

On the assessment of high-quality images: advances on the JPEG AIC-3 activity

A generative AI approach to cost-effective advertisement based on synthetic images

Exploration of Media Blockchain Technologies for JPEG Privacy and Security

Influence of Spatial Rendering on the Performance of Point Cloud Objective Quality Metrics

A simple method to obtain visual attention data in head mounted virtual reality

Multiview Distributed Video Coding with Encoder Driven Fusion

DEAP: a database for emotion analysis using physiological signals

Saliency Driven Perceptual Quality Metric for Omnidirectional Visual Content

Analysis of the Limits of Graph-Based Object Duplicate Detection

Steganography for Three-Dimensional Polygonal Meshes

Non-Linear EEG Features for Odor Pleasantness Recognition