Looking for Participants

The MPI for Biological Cybernetics is looking for participants for some of their research experiments [more].
 

Most recent Publications

Fademrecht L, Bülthoff I and de la Rosa S (June-2017) Action recognition is viewpoint-dependent in the visual periphery Vision Research 135 10–15.
Cocchi L, Yang Z, Zalesky A, Stelzer J, Hearne LJ, Gollo LL and Mattingley JB (June-2017) Neural decoding of visual stimuli varies with fluctuations in global network efficiency Human Brain Mapping 38(6) 3069–3080.
Schindler A and Bartels A (May-2017) Connectivity Reveals Sources of Predictive Coding Signals in Early Visual Cortex during Processing of Visual Optic Flow Cerebral Cortex 27(5) 2885-2893.
Rajappa S, Bülthoff HH and Stegagno P (May-2017) Design and implementation of a novel architecture for physical human-UAV interaction International Journal of Robotics Research Epub ahead.
Lee AS, Azmitia EC and Whitaker-Azmitia PM (May-2017) Developmental Microglial Priming in Postmortem Autism Spectrum Disorder Temporal Cortex Brain, Behavior, and Immunity 62 193–202.

 

ScanLab

Left: ABW scanner setup. Right: Sample data of the ABW structured light scanner

Several commercial 3D scanning systems are used for capturing shape and color information of faces. The data is used for producing stimuli for psychophysical experiments and for building models to support machine learning and computer vision algorithms:

Cyberware Head Scanner
This scanner (Cyberware, Inc., USA), uses laser triangulation for recording 3D data and a line sensor for capturing color information, both producing 512 x 512 data points (typical depth resolution 0.1 mm), covering 360º of the head in a cylindrical projection within 20 s. It was extensively used to build the MPI Head Database (http://faces.kyb.tuebingen.mpg.de/).

ABW Structured Light Scanner
This is a customized version of an industrial scanning system (ABW GmbH, Germany), modified for use as a dedicated face scanner. It consists of two LCD line projectors, three video cameras and three DSLR cameras. Using structured light and a calibrated camera/projection setup, 3D data can be calculated from the video images using triangulation. Covering a face from ear to ear, the system produces up to 900.000 3D points and 18 megapixels of color information. One recording takes about 2 s, thus making this scanner much more suitable for recording facial expressions. It was used extensively for building a facial expression model and for collecting static FACS data.

ABW Dynamic Scanner
Using the same principle of structured light, this system uses a high-speed stripe pattern projector, two high-speed video cameras and a color camera synchronized to strobe illumination. It can currently perform 40 3D measurements/s (with color information), producing detailed face scans over time. Ten seconds of recording time produce 2 GB of raw data.

3dMD Speckle Patter Scanner
This turn-key system (3dMD Ltd, UK) is mainly designed for medical purposes. Using four video cameras in combination with infrared speckle pattern flashes and two color cameras in sync with photography flashes, it can capture a face from ear to ear in 2 ms, making it highly suitable for recording infants and children. This system is used in collaboration with the University Clinic for Dentistry and Oral Medicine for studying infant growth.

Passive 4D Stereo Scanner
With three synchronized HD machine vision cameras (two grayscale, one color), this system (Dimensional Imaging, UK) is capable of reconstructing high-quality dense stereo data of moving faces at a rate of 25 frames/s. Since it is a passive system, high-quality studio lighting can be used to illuminate the subject which results in better color data as well as more subject comfort, compared to the ABW Dynamic Scanner. While care must be taken with focus, exposure and calibration of the cameras, the system imposes fewer limitations on rigid head motion.

 
Last updated: Friday, 14.10.2016