R&D Seminar: Image representation and processing with binary partition trees

R&D Seminar: Image representation and processing with binary partition trees
January 30, 2014 11:30
CRIM (405, avenue Ogilvy, bur. 101, Montréal)

January 30, 2014, from 11:30 am to 12:30 pm, room 7
At CRIM, 405 Ogilvy Avenue, Suite 101, Montréal
Conference free of charge, registration mandatary at Carmen.Robert@crim.ca

Speaker: Philippe Salembier, Ph.D., Department of Signal Theory and Communications, Universitat Politecnica de Catalunya

Abstract: This talk will discuss the interest of hierarchical region-based representations of images such as Binary Partition Trees. These representations can be considered as an initial abstraction from the signal in which raw pixels are grouped by similarity to form regions, which are hierarchically structured by inclusion in a tree. They provide multiple resolutions of description and easy access to subsets of regions. Their construction is often based on an iterative region-merging algorithm. This approach and the associated notions will be discussed. Several examples of construction will be illustrated for color, synthetic aperture radar (SAR) and hyperspectral images. Once constructed, BPTs can be used for many applications including filtering, segmentation, classification and object detection. Many processing strategies consist in populating the tree with features of interest for the application and in applying a specific graph-cut called pruning. These ideas will be illustrated in particular for hyperspectral image classification and for SAR speckle noise filtering. This last topic is currently addressed in collaboration with the Vision and Imaging team of CRIM.

Biography: Philippe Salembier received an engineering degree from the École Polytechnique, Paris, France, in 1983 and an engineering degree from the École Nationale Supérieure des Télécommunications, Paris, France, in 1985. From 1985 to 1989, he worked at Laboratoires d'Electronique Philips, Limeil-Brevannes, France, in the fields of digital communications and signal processing for HDTV. In 1989, he joined the Signal Processing Laboratory of the Swiss Federal Institute of Technology in Lausanne (EPFL), Switzerland, to work on image processing and received a PhD in 1991. At the end of 1991, after a stay at the Harvard Robotics Laboratory as Postdoctoral Fellow, he joined the Technical University of Catalonia, Barcelona, Spain, where he is currently professor lecturing in the area of digital signal and image processing. His research interests include image and video sequence processing, compression and indexing, mathematical morphology, level sets and nonlinear filtering, as well as remote sensing image processing and signal processing tools for genomics. He is currently spending one year in the Vision and Imaging team of CRIM. Additional information can be found at https://imatge.upc.edu/web/philippe

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