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Heinrich Bülthoff
Biological Cybernetics
Max Planck Institute
Spemannstr. 38
Tuebingen, D-72076
Germany
Office phone: +49-(0)7071-601601
Office fax: +49-(0)7071-601616
Email: heinrich.buelthoff@tuebingen.mpg.de
Home page: http://www.kyb.tuebingen.mpg.de
Change Detection Research Interests
Change detection research together with Guy Wallis has concentrated mainly on our ability to analyze dynamic, natural scenes with regard to the attributes of their constituent objects. We used video editing techniques to mix 12 recordings from a car driving along a street with 30 km/h. The videos differed only by changes made in the location, color, orientation or presence of 3 from 6 objects. Thirty new videos were generated by mixing two of the 12 recordings. Mixing involved recording 8 frames from video A, 8 frames of a uniform gray image, 8 frames from video B, a further 8 gray images, and than back to video A, until 400 frames had been processed. During testing, subjects saw the new videos and had to report any changes observed in the scene. By using this video mixing technique we were able to analyze the speed and accuracy of the analysis of a dynamic real-world scene. The results demonstrate that the instanteneous, full and detailed perception of a scene which we experience, is simply illusory, confirming other work on static scenes. This work also demonstrates that including multiple changes may cause changes to be noticed but falsely categorized, and that the delay between each report of a change is remarkably consistent, suggesting a time-windowed shifting of attention.
Other Research Interests
Object recognition, spatial cognition and sensor-motor (see also http://www.kyb.tuebingen.mpg.de/bu/projects)
Change Detection Publications
Wallis, G. and H. Bülthoff (1999) Learning to recognize objects. Trends In Cognitive Sciences 3, 22-31.
Distler, H.K., H.A.H.C. van Veen, S.J. Braun, W. Heinz, M.O. Franz and H.H. Bülthoff (1998) Navigation in real and virtual environments: Judging orientation and distance in a large-scale landscape. In: Virtual Environment 98: Proceedings of the Eurographics Workshop in Stuttgart, Germany, June 16-18, 1998, (Eds.) M. Goebel, U. Lang, J. Landauer, M. Walper. Springer, Wien 1998, 124-133.
Franz, M.O., B. Schölkopf and H.H. Bülthoff (1998) Where did I take that snapshot? Scene-based homing by image matching. Biological Cybernetics 79, 191-202.
Tarr, M.J. and H.H. Bülthoff (1998) Image-based object recognition in man, monkey and machine. Cognition 67, 1-20.
Van Veen, H.A.H.C., H.K. Distler, S.J. Braun and H.H. Bülthoff (1998) Navigating through a virtual city: Using virtual reality technology to study human action and perception. Future Generation Computer Systems 14, 231-242.
Wallis, G.M. and H.H. Bülthoff: Scene and not seen (1997) Noticing changes in complex environments. Investigative Ophthalmology and Visual Science 38, 1730.
Chris G. Christou, Bosco S. Tjan & Heinrich H. Bülthoff (1999) Viewpoint information provided by a familiar environment facilitates object identification MPI Technical Report No. 68
Chris G. Christou & Heinrich H. Bülthoff (1999) The perception of spatial layout in a virtual world.MPI Technical Report No. 75.
Heinrich H. Bülthoff & Hendrik A.H.C. van Veen (1999) Vision and Action in Virtual Environments: Modern Psychophysics in Spatial Cognition Research. MPI Technical Report No. 77.
Chris Christou, Heinrich H. Bülthoff (1998) Differences between Active-Explorers and Passive-Observers in Virtual Scene Recognition. MPI Technical Report No. 62.
Tarr, MJ, Bülthoff, HH (1996) Scene Recognition Workshop Tübingen July 3-5, MPI Technical Report No. 30
Wallis, G. and H.H. Bülthoff (2000) What's scene and not seen. Visual Cognition: Special Issue on Change Detection and Visual Memory, 7, 175-190.
Wallis, G.M. and H.H. Bülthoff (1998) Scene analysis whilst traveling a virtual roadway. Investigative Ophthalmology and Visual Science 39, 5200. (ARVO 1998).
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