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TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20370308T030000 RDATE:20371101T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:eaa3425c1034b42767799c2674a60b5a CATEGORIES:Human and computer vision series:Fall 2010 CREATED:20151203T141542 SUMMARY:CLICK HERE TO VIEW each speaker's title and abstract LOCATION:Computer Science Department\, Rutgers University and Psychology Department \, Rutgers University DESCRIPTION:
Anatoliy Kats (Computer Science Department, Rutgers University)
"Medial Part Abstraction and Grouping from Images"
Medial axis-based representations represent a powerful class of symmetry -based shape decomposition that supports effective shape categorization. Ho wever, their applicability to real scenes has been severely limited due to their restrictive assumption that the object's silhouette is available.&nbs p; We present a novel framework for recovering a set of symmetric parts fro m a cluttered scene, and grouping them to form an approximation to an objec t's medial axis transform. Starting with a set of extracted image contours, one of the key contributions is a transformation of the symmetry-based per ceptual grouping problem from the space of image contours to the dual space of medial contours. Given the graph of hypothesized medial axis fragments, we introduce a weight function that captures the nonaccidental relations b etween pairs of these fragments, and use it to group together medial fragme nts that belong to the same part, or medial branch. Defining a graph over t he recovered parts, we introduce a second weight function that drives the g rouping of parts into objects, effectively assembling the medial branches t o yield the final medial axis approximation. The ability to recover a media l axis approximation of an object from a cluttered image will allow a rich community of skeleton-based recognition algorithms access to real-world ima ging conditions.
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Vicky Froyen (Psycholog y Department, Rutgers University)
"Rhythmic Timing and Movement Trajectories in Musical Expertise"
Timing of motor behavior is an important aspect of
everybody's behavior, but crucial for musicians. Previous research has
shown that musicians are better in timing tapping movements than non
-musicians. We take this one step further by studying the movement trajecto
ries underlying rhythmic timing in experts and novices. Our guiding hypothe
ses were: (a) experts adapt their trajectories more to the task const
raints (target duration, rhythm complexity) imposed by the goal to min
imize timing variability than novices do, and (b) along with lower timing v
ariability experts are also more consistent in the movement trajectories th
ey implement to realize their timing goals. As part of a larger fMRI study,
12 professional musicians (experts) and 12 non-musicians performed three i
sochronous tapping tasks (target durations 400, 800, and 1200 ms) and two r
hythms which were composed of the same target durations. We measured angula
r movement trajectories at the wrist joint by means of a non-ferromagnetic
shaft encoder attached to a lower-arm orthosis. Performance was asses
sed after extended laboratory practice for the novices (8 sessions) and mor
e limited training (3 sessions) for the experts. Movement trajectories for
individual intertap intervals were parsed into three segments: dwell time a
fter previous tap, final extension-flexion towards the tap ending the inter
val, and potential movements subdividing periods between the first and the
final phase. Results showed that non-musicians typically had short dwelltim
es and hardly ever performed subdividing movements. In contrast, half of th
e expert participants systematically applied subdivisions after short dwell
times. The adaptability of this approach was amply demonstrated by
the
finding that frequency of usage of this strategy increased as a function of
interval duration and rhythmic complexity. The other half of musician part
icipants showed very long dwelltimes before initiating their final extensio
n-flexion movement towards the next tap. These findings provide support for
our first hypotheses. Data analyses related to the second hypothesis showe
d that musicians do not have a higher consistency in their trajectory varia
bles than non-musicians. In contrast their timing variability was found to
be less. In summary we showed that expertise is not only related to the tim
ing-level coordination but also to the trajectory-level coordination of rhy
thmic tapping.