Signal Image Telecommunications
The research activities of the SITe team revolve around two main axes: the development of advanced methods of coding and interpretation of images and video and the allocation of radio resources in mobile networks and sensor networks (Internet of Things).
Advanced methods of images and video coding and interpretation
Part of the team’s activities involves image analysis in different application contexts, including medical imaging. In this context, the team has developed strong collaborations with the Clinical Investigation Centre of the Quinze-Vingts hospital, which is specialized in the study and the treatment of eye diseases or with the Institut Gustave Roussy, the first center for the fight against cancer in Europe. The team’s image analysis research focuses in particular on
- The study of blinding diseases due to degeneration of the retina or alterations of the optic nerve,
- The study of retinal vascularization and its modification in case of anomalies,
- The characterization of methods of quantification of tumor vascularization by dynamic contrast ultrasound.
This research is carried out in collaborative projects involving hospitals, academic and industrial partners, financed by public funds (ANR, FUI, RHU, Inserm, etc.).
Other areas covered by the SITe team include digital document reissue, in particular optical recognition of musical partition, biometrics and sustainable agriculture.
Recent years have seen revolutionary advances in image and video processing technologies. Storage capacities, as well as communication capabilities, have also experienced enormous technological developments.
The SITe team is developing new approaches to meet the current demands on the entire image / video transmission chain: from the acquisition stage (with various formats of representation or sampling), the different gradual coding schemes (to optimize access to information to a variety of receivers), up to robust transmission over heterogeneous networks.
Among the many challenges encountered, the SITe team is particularly interested in:
- the cost reduction of acquiring the high-definition video signals from compressed acquisition methods to ensure the reduction of both the memory and the computing power in the detection / acquisition device and greatly reduce the bandwidth Of transmission,
- the development of new effective video / image coding techniques to accommodate huge fluctuations in bandwidth and display from one user to another,
in order to improve the compression technologies to offer an increasingly rich content to the users.
Resource coding and allocation in mobile and sensor networks
With the massive growth in demand for wireless connectivity, available radio frequencies are becoming increasingly scarce. The telecommunications research activities of the SITe team concern the optimization of access to radio resources in ad-hoc networks and in sensor networks. In particular :
- the design of terrestrial ad-hoc network / satellite network coupling algorithms.
- the dimensioning, resource management and optimization of energy consumption in IoT cellular networks, such as the Low Power Wide Area Network (LPWAN).
The team is also working on designing and evaluating the performance of coding schemes for wireless optical communications with multi-antenna systems aimed at minimizing the error rate and maximizing transmission rate.
This research is carried out in collaboration with academic partners (Télecom ParisTech, CNAM, CentraleSupélec, INSA Lyon, Cergy Pontoise University) and industrial companies (Thalès Communications, Sequans, CEA), financed by public funds (thesis CIFRE , ANR projects, CNRS, …).