Successful identification of specularities in an image can be crucial for an artificial vision system when extracting the semantic content of an image or while interacting with the environment. Ozgur Yilmaz and Katja Doerschner developed an algorithm that relies on scale and rotation invariant feature extraction techniques and uses motion cues to detect and localize specular surfaces. They used appearance change in feature vectors to quantify the appearance distortion on specular surfaces, which has previously been shown to be a powerful indicator for specularity (Doerschner et al. in Curr Biol, 2011). The algorithm combines epipolar deviations (Swaminathan et al. in Lect Notes Comput Sci 2350:508–523, 2002) and appearance distortion, and succeeds in localizing specular objects in computer-rendered and real scenes, across a wide range of camera motions and speeds, object sizes and shapes, and performs well under image noise and blur conditions.
The corresponding article was published in Machine Vision and Applications, April 2014.
Cemre Ariyurek has defended her Master of Science thesis on Jan 29, 2014. The title of the thesis is "Modes of Shear Waves in Magnetic Resonance Elastography." In this thesis, Cemre demonstrated that when the head is vibrated using a mount-piece at some specific frequencies, called eigenfrequencies, high-amplitude shear waves may occur. Cemre plans to continue working on this subject during her PhD studies.
Esra Abaci Turk, graduate of Bilkent University, authored a MRM publication that introduces a new and useful equation in magnetic resonance imaging. This equation will help researchers to calculate radiofrequency magnetic field distribution in the body. In this method, an off-resonance RF pulse is applied to the object during an imaging procedure. This pulse introduces a phase shift, which is called Bloch-Siegert shift, in the image. Before Esra's publication, the amount of shift is calculated using an equation that is not very accurate. Although still an approximation, Esra's equation results in a better fit to the actual phase shift. Figure shows an example case. The other authors of the paper are Yusuf Ziya Ider, Arif Sanli Ergun and Ergin Atalar.
Dr. Hulusi Kafaligonul has received a TUBITAK 1001 grant.The title of the research project is "Neural Mechanisms Underlying Multisensory Perception of Speed". A brief description of the project is as follows:
Speed perception is essential for survival in a dynamic world. By using our estimation of speed, we are able to cruise through morning traffic and judge the trajectories of fast approaching objects. Motion studies have typically focused on the neural mechanisms within one modality (i.e., vision). However, the human brain is adapted to operate optimally in natural environments in which behavior is guided by information integrated across multiple sensory modalities (e.g., audition). Therefore, this unisensory approach fails to tap into natural perceptual mechanisms.
During this TUBITAK funding, Dr. Kafaligonul will focus on this gap and he aims to investigate how the timing information provided by audition is used to estimate our final perception of visual speed. By using Electroencephalography (EEG) and psychophysical methods, he will examine auditory influences on perceived speed under different time adaptation/ visual grouping conditions and elucidate neural correlates of these influences. Within the framework of speed perception, the outcomes of the project will have significant contributions to bridging the gap between our unified multisensory experience of the world and the neural activities/oscillations in the brain.
We had our traditional new year celebration party in UMRAM. It has always been a very good opportunity for all of us to get together, rest and relax and chat away which we can not do very often as a result of our busy schedules. We would like to thank once more everybody who has come and made this evening a very special event for us.
Katja Doerschner, a faculty member of UMRAM and Department of Psychology, has passed the Associate Professorship exam of YOK (Counsel of Higher Education). This exam is part of Associate Professorship promotion process in Bilkent University. Although there remains a lengthy process for her promotion, this is a very important component of it. As UMRAM family, we would like to congratulate Dr. Doerschner for her success in this exam and wish best for rest of her academic life.
Dr. Emine Ulku Saritas and Dr. Tolga Cukur has published a new paper on Magnetic Resonance in Medicine (MRM) titled "Hadamard Slice Encoding for Reduced-FOV Diffusion Weighted Imaging". This work aims to increase the utility of diffusion weighted imaging (DWI) by extending the slice coverage of a high-resolution reduced field-of-view (FOV) technique previously developed by Dr. Saritas. The paper can be reached at the following link: http://dx.doi.org/10.1002/mrm.25044
- Postdoctoral Researcher - Dr. Thangavel
- Patent on Cervical Imaging Apparatus
- Seminar by Dr. Olman, UMN
- new members of UMRAM
- Patent for prostatic intervention
- Ergin Atalar has been elected to Academia Europaea
- Two New Faculty Members Join UMRAM
- Dr Dicle Dövencioğlu
- Dr. Esra Abaci Turk
- Katja Doerschner has been awarded in GEBIP by TUBA
- UMRAM was at ISMRM 2013
- UMRAM welcomes its new Assistant Professor, Hulusi Kafaligonul
- UMRAM hosted the "Basic fMRI Course" organized by The Psychiatric Association of Turkey (PAT)
- Dr. Devashish Shrivastava Visit
- Dr. Irtiza Gilani
- Promotion of Huseyin Boyaci
- NEW YEAR CELEBRATION IN UMRAM
- TUBITAK 47 Science Awards are given to their recipients.
- Patent on Implant Heat Reduction
- Women and men showed different patterns in white matter alterations associated with epilepsy