Creating and sharing knowledge for telecommunications

Inverse Problems in Image Processing


on 20-11-2019

... Mehran Ebrahimi, from the Faculty of Science of the Ontario Tech University, Canada

Date & time: Wednesday, November 20th, 15:30h
Location: Instituto Superior Técnico, Lisbon, Room 4.12/LT2 (4th floor of the North Tower)


Abstract:
In many practical problems in the field of applied sciences, the features of most interest cannot be observed directly, but have to be inferred from other, observable quantities. The problem of solving an unknown object from the observed quantities is called an inverse problem. Many classical problems in imaging can be modeled as inverse problems. Many real-world inverse problems are ill-posed, mainly due to the lack of existence of a unique solution. The procedure of providing an acceptable unique solution to such problems is known as regularization. Indeed, much of the progress in image processing in the past few decades has been due to advances in the formulation and practice of regularization. This, coupled with the progress in the areas of optimization and numerical analysis, has yielded much improvement in computational methods of solving inverse imaging problems.

In this talk, we will revisit a number of inverse problems including image registration (alignment), image inpainting (completion), super-resolution (resolution enhancement), and present some recent research ideas mainly aimed at medical imaging applications. Furthermore, we present an approach based on deep convolutional neural networks to address two image restoration problems, image inpainting, and super-resolution. The method applies our so-called “Edge-Connect”, a two-stage adversarial model that contains an edge generator followed by an image completion network. We evaluate the model and observe that it outperforms current state-of-the-art techniques quantitatively and qualitatively.


Biography:
Mehran Ebrahimi is an Associate Professor with the Faculty of Science, University of Ontario Institute of Technology (Ontario Tech), Canada. He received his Ph.D. from the Department of Applied Mathematics, University of Waterloo, in 2008, and he currently leads the Imaging Lab in the Faculty of Science at Ontario Tech. His research is focused on the diverse area of machine learning, mathematical imaging, and inverse problems. His long-term research objective is directed towards developing and validating efficient numerical methodologies for solving real-world ill-posed inverse problems in the field of medical imaging.
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International Microwave and Optoelectronics Conference - IMOC 2019


on 10-11-2019

... The radio and optical systems are ubiquitous in modern society, being key enabling technologies addressing several societal challenges. Researchers, engineers and end users interested in these fields are welcome to join us in Aveiro, Portugal for the 18th edition of the International Microwave and Optoelectronics Conference (IMOC) in November 2019.

The International Microwave and Optoelectronics Conference was initiated in 1985, biennially, aiming at exchange and dissemination of scientific and technological knowledges. It is currently an event sponsored by the Brazilian Microwave and Optoelectronic Society (SBMO) and the IEEE Microwave Theory and Techniques Society (MTT-S). For the first time since its creation IMOC will leave the Brazilian territory and will be held in Portugal. The organization will be in charge of the Instituto de Telecomunicações / Universidade de Aveiro / Instituto Superior Técnico and the Federal University of Espírito Santo.

Participants are encouraged to submit an 3 page paper for presentation aiming at sharing knowledge, promote collaborations and foster partnerships among the participants from academia and industry. Oral and poster presentations will cover the latest research trends, new methods or technologies, advanced prototypes, systems, tools and techniques, as well as general survey papers indicating future directions, on both radio/microwave and photonic/optics fields. We will learn, with a broad emphasis, on about advances in applications of the optical and radio technologies.

The conference will address cutting-edge research in established areas related with the use of radio/microwave and photonic/optics as well as their adoption in support of a wide variety of new services, included (but not limited) in the following tracks, covering both theoretical and practical aspects:
• Circuits, Systems and Networks
• Fundamental Effects, Devices and Components
• Field trial and applications: 5G; Internet of Things / Cyber Physical Systems, Energy, Satellite More Information..