BUSIM: Center for Signal and Image Processing
Lab Image:
Bogazici University Signal and Image Processing (BUSIM) laboratory has been one of the most productive multidisciplinary research milieus. Its research horizon encompasses the theory and the applications of image processing, speech processing, video coding, computer vision, signal processing for communications; security and biometry. Since its inception in 1993 it has graduated more than twenty PhDs and close to a hundred MSc students. BUSIM has hosted several guest researchers and a multitude of national and international projects.
Research Fields:
Research Title:
Performance and security improvement with multibiometrics
Research SubTitles:
Biometry for hand, voice and face; 2D and 3D face processing; multimodality in biometry; feature extaction and classifier fusion; hash functions
Research Title:
Automatic processing of human faces for man-machine interfaces
Research SubTitles:
Facial action coding system and Action Units; Conformal mapping; Gabor wavelets; nonlinear registration; face and head gestures
Research Title:
Information Theoretic and Detection Theoretic Analysis of Robust Signal Hashing
Research SubTitles:
We view the robust hashing problem (also known as passive fingerprinting) as a communications problem where the hash value represents the ID of the content to which it belongs. We explore fundamental limits of corresponding communication systems, derive capacity expressions, as well as carry out detection theoretic analysis of a certain class of hash mappings.
Research Title:
Statistical and Information Theoretic Approaches to True Random Number Generation
Research SubTitles:
We focus on a specific class of true random number generator circuits topologies. Relying on certain statistical assumptions on the underlying naturally-occurring continuous-time stochastic process, we analyze and quantify security properties of the resulting bit stream using information theoretic primitives.
Research Title:
Detection Theoretic Aspects of (Active) Signal Fingerprinting
Research SubTitles:
We concentrate on digital fingerprinting in the presence of collusion attacks and model the resulting framework as MAC (multiple access channel). We quantify detection theoretic properties of a number of receivers for various classes of fingerprinting codes.
Research Title:
Robust Digital Watermarking Resistant Against Geometric Attacks
Research SubTitles:
We focus on (improved) spread spectrum watermarking and construct a generalized version of it where the goal is to be able to gain approximate invariance in the presence of translation attacks. We quantify the fundamental trade-offs of the resulting system.
Research Title:
Statistical and Information Theoretic Approaches to Cryptanalysis
Research SubTitles:
We impose a probabilistic setup for a sufficiently broad class of attack approaches. Using asymptotic equipartition property and basic information theoretic primitives, we derive achievable upper bounds on attack complexity.
Research Title:
Robust Hashing of Face Images and Speech Signals
Research SubTitles:
We focus on practical aspects of content authentication. In particular, we focus on face images and speech signals. Via utilizing learning techniques together with meaningful pseudo-random pattern extraction methods, we derive approximately invariant signal features and use them to construct robust hashes.
Research Title:
Content Authentication Using RFID System;
Research SubTitles:
We focus on practical RFID systems, explore limits of existing RFID protocols, as well as propose a number of application scenarios where we use RFID systems to achieve security and authentication.
Research Title:
Applications of Independent Component Analysis in Communications, Image Processing and Geophysics
Research SubTitles:
Content protection applications; Face and lip analysis; Brain activity classification; Analysis of climatological data
Research Title:
Applications of Source Separation in Image Processing, Communications, and Geophysics
Research SubTitles:
Bayesian source separation for functional optical imaging; Source separation in CDMA communication; Detection of defects in textiles, Restoration of mixed, degraded document images; Earthquake triggering intensity prediction
Research Title:
3D Object Indexing and Content Based Retrieval
Research SubTitles:
Shape descriptors, content-oriented indexation, 3D representations and feature vectors
Research Title:
Design of Steganalyzers for Image and Audio
Research SubTitles:
Perceptual hash functions, watermarking, audio quality metrics, multimedia attacks; audio retrieval
Research Title:
SIMILAR Network of Excellence: Man-machine interfaces similar to human to human communication
Research SubTitles:
Face landmarking; Sign language understanding; 3D Visualization, Interacting with 3D data,; Emotion analysis of speech;
Research Title:
Texture defect detection for textile goods
Research SubTitles:
Texture classification in terms of defective and nondefective, pattern recognition
Research Title:
Modelling of nonstationary and nonGaussian signals
Research SubTitles:
Particle filter modeling, Bayesian modelling, MCMC
Research Title:
Blind Deconvolution
Research SubTitles:
Receiver Function analysis of seismological data, Varaitonal Bayesain apporcah, sparse signals
Research Title:
Earthquake Early Warning System
Research SubTitles:
Distributed detection under impulsive noise using particle filters and decision fusion using particle filters
Research Title:
Uncertainity reduction in parts-moving problem in robots
Research SubTitles:
Particle filter approach to noise (uncertainity) reduction for moving robots
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