patch2012_paper_1

adfa, p. 1, 2012.
© Springer-Verlag Berlin Heidelberg 2012
Early Detection of Museum Visitors Identities by Using a
Museum Triage
Eyal Dim and Tsvi Kuflik
The University of Haifa, Mount Carmel, Haifa 31905, Israel
dimeyal@bezeqint.net, tsvikak@is.haifa.ac.il
Abstract. The visitor to a museum may start the visit with an identity that de-
pends on various short-term and long-term personal characteristics of the visi-
tor, the museum itself and the visit context. Falk [2009] posits that the visi-
tor's identity would be one of the following: explorer, attraction-seeker, pro-
fessional/hobbyist, recharger, or facilitator. Each one of the identities fits a
different behavior in the museum. Early detection of a visitor's identity at the
beginning of the visit would enable better adaptation to the visitor's needs,
and as a result improve the museum visit experience. We present the museum
triage concept and its demonstration that are focusing on achieving this goal.
Keywords: user modeling, social signal processing, context awareness, dynam-
ic contextualization, museum visitor identity.
1 Introduction
It is well accepted among the user modeling community, that a person has different
needs in different contexts [Byun and Chevest, 2001]. Some of the User Model (UM)
data has lifelong persistency (e.g., birth date), while other data is instantaneous, and
depends on the current context (e.g., the user's current blood pressure). In the case of a
museum visit, the UM may include a combination of short term, long term and medi-
um term attributes. A user may have short term interests encountering a serendipitous
exhibit, long term interest based on personal preferences (such as preferring archeolo-
gy museums over art museums), or medium term interests based on the visit context
(e.g., a tourist at a new city, or going with a group of friends to a museum that fits
all). Therefore, the adaptation to museum-visitor's needs requires identification of
such contextual aspects through dynamic contextualization [Zhu et al., 2006]. The
context detection may help in the identification of the visitor's identity, as presented
by Falk [2009] (see related work below). An instrumented museum may enable to
detect such context, enabling a smart visitor's guide system to provide a valuable per-
sonalized service throughout the visit (as well as to continuously adapt to it) [Kuflik
et al., 2010]. Examples of such response may be suggesting interesting exhibits to a
bored visitor, or not disturbing a visitor immersed in the exploration of exhibits.
There are two separate context detection problems. First, there is the bootstrap pe-
riod where data about the new visitor needs to be learned and an initial UM is built.

Second, assuming that a UM already exists at the onset of the visit (as suggested by
[Kuflik and Poteriaykina, 2009], there is a need for rapid identification of deviation of
the UM in the current context from the long-term profile. Therefore, it seems that
there is a need for special attention to the "start of visit area" in the museum. This
space of the visitor's first encounter with the museum may be used as an area of inten-
sive data collection about the user. The collected data may enable the enhancement of
visit experience during the rest of the visit. We called this concept the triage, follow-
ing the hospital triage, where physicians decide on the course of patient treatment. In
a museum triage, a smart environment may decide on the best way to enhance the
visitors' experience by using evidence based UM. Although the triage concept is pre-
sented for the museum case, it may apply to other environments such as shopping
malls or conference halls. The triage concept may give an answer both to the boot-
strap problem and to the dynamic contextualization needed for adjusting the UM to
the current context. It is a paradigm that enables proactive UM updates at an obvious
change point – the entrance to a new place.
2 Related Work
Falk [2009] suggested the Identity-related Museum Visit Experience Model. It con-
tains a typology of five visitor-identity prototypes: (i) The "Explorer" who visits the
museum because of curiosity or general interest in discovering more about the subject
matter introduced by the museum. (ii) The "Experience Seeker", often a tourist, is
typically motivated by looking for the main attraction the museum is known to offer.
(iii) The "Professional / Hobbyist" who is interested in specific topics out of the full
collection of the museum visit. (iv) The "Recharger" who comes to the museum to
reflect, to rejuvenate or to relax and absorb the atmosphere. Finally, (v) the "Facilita-
tor" who visits the museum in order to satisfy the needs and desires of someone they
care about rather than just herself or himself. The identities suggested by Falk are a
lumping of more detailed identities, proposed by other researchers, as described in
[Falk, 2009]. Falk suggests a Museum Visitor Experience Model that takes into ac-
count the museum and the visitor as well as other factors. The visitor has a personal
context (visitor's traits), physical context (external conditions in the museum) and
socio-cultural context (companions, the right way to behave, etc.). These have impact
on the visitor's identity and perception of the museum. The visitor enters the museum
with particular personal identity relevant to this specific visit and to the perception of
the museum affordances. This has impact on his behavior in the museum, hence, if
detected, it may be used by a system for enhancing the museum visit experience. The
triage in our case is used to detect some of the traits of identities described above, and
enable a museum visitors' guide system to better adapt to the specific visitor.

3 The Hecht-Museum Triage
The triage has been set up at the Hecht museum1
, an established archaeological muse-
um located at the University of Haifa campus. The museum offers a number of exhi-
bitions related to the archaeology of the land of Israel going back to 4500 BCE. As
part of the PIL museum visitor's guide project [Kuflik et al., 2010], the museum is
equipped with a wireless sensor network of Radio Frequency (RF) based indoor posi-
tioning system. It has three different types of components: small (matchbox size)
mobile wearable RF tags called Blinds (Figure 1a) stationary RF tags called Beacons
(Figure 1b), and RF to TCP Gateways. Beacons are statically located at entrances and
exits, as well as near relevant locations of interest in the museum, having limited area
coverage for proximity sensing (Figure 1c). The Blind sensors are carried by museum
visitors. Each Blind sensor transmits a unique identification (ID). The Blind sensors
measure the following time tagged signals: proximity to Beacons (detecting location
in the museum); proximity to other Blinds (detecting social proximity among visi-
tors); compass data (measuring visitor's orientation); voice level (detecting whether a
visitor is speaking or not, without recording of the visitor's conversation for privacy
reasons); and acceleration data through accelerometers. The Gateways transfer data
reported by the Blinds and Beacons over a local area network to the PIL's server.
Beacons are placed in areas of interest, where visitors may view multimedia presenta-
tions about exhibits. In general, the distance between adjacent beacons is about 3-4
meters.
The idea of the triage is to collect as much information as possible at the very be-
ginning of the visit. Therefore, to gain better positioning within the triage, we popu-
lated it with additional sensors (stationary Blinds near exhibits, in this case, that
measured proximity to visitors, while visitors' Blinds also measured proximity to the
stationary ones). Figure 2 presents the museum layout at the top while the triage area
(in pink) is enlarged at the bottom. While providing a reasonable indoor positioning
solution, the system has two major weaknesses. First, it only knows when a person
wearing a Blind is in proximity to a Beacon or another Blind. Thus, it does not detect
positioning in transition from one Beacon or stationary Blind to another. Second, the
specified detection range in proximity to each Beacon or Blind is two meters. Thus,
when we detect a user being in proximity to a Beacon we can only know that he is
within two meters of that Beacon, without knowing the exact position.
As we see in figure 2, the entrance leads to the triage, which is shaped as a corri-
dor about 14 meters long and 4 meters wide. There are exhibits along both sides of the
triage. Three Beacons and ten stationary Blinds were located in the triage. The corri-
dor shape of the Hecht Museum triage gives additional information: it has four main
directions that enable distinction between visitor's interest in exhibits on one side of
the corridor or the other, or just walking through the corridor. Time is an important
measure, as it helps measuring the attraction power and the holding power of exhibits.
In this case, we are interested in the visitors’ behavior, hence the time-tagged data is
used for assessing the visitor identity. For example: a professional visitor going to a
1
http://mushecht.haifa.ac.il/Default_eng.aspx

specific archeological point of interest in the internal part of the museum is expected
to go faster through the triage, while an explorer is expected to stay longer near some
exhibits and examine them. Another typical example is when a group of three visitors
split, where one of the visitors is walking around, turning back and forth, expressing
little interest in the exhibits, while the others have an explorer identity going together
slowly, watching exhibits and discussing them.
(a)
(b) (c)
Fig. 1. Positioning system equipment and usage scenario.
Fig. 2. The Instrumented Hecht Museum map and the enlarged triage map
We have gathered data of about 200 visitors, most of them came in small groups
of 2-6 people. Groups are explicitly identified at the museum counter, by entering the
group members' Blind sensor IDs. The visitors were videotaped, and the videos were
used as a reference to identify their behavior and identity. We also collected demo-
1st
Floor
2nd
Floor
Triage
Legend: Beacon Blind Gateway
Entrance

graphic data through questionnaires. Behavioral patterns have been collected (data
logs) and are currently being analyzed. The focus of the analysis is on finding simple
evidence that would lead to revealing part of the museum visitor identities while the
visitors are walking through the triage.
4 A Museum Triage Analysis Example
Peter Jane and Mary (pseudonym) came together as a group to visit the museum. Pe-
ter, a 26 years old male student was walking together with Jane a 78 years old wom-
an. They were walking patiently through the triage, paying attention to exhibits for
quite a long time, and having a conversation. It looked like they had a lot of interest in
what the exhibits at the triage had to offer. They seemed to fit the explorer identity
described by Falk [2009], but also had social interest in each other. The third group
member, Mary, a 25 years old female student was going purposeless in the triage,
showing little interest in the museum exhibits. She was wondering around and
yawned from time to time. She seemed bored. She seemed to fit a special type of
visitors, those who did not want to come to the museum, but came because of the
others in the social group, and did not like the idea. The walk through the triage took
the group 812 seconds (13.5 minutes), about 17% of their total visit duration of 4,769
seconds (79.5 minutes). The analysis of the data collected during the triage, as well as
during the whole visit, is presented in Figure 3. The figure presents the trigae start
time as a dotted blue vertical line, the triage end time as a dashed green vertical line,
and the visit end time as a solid red vertical line as well as the measurements' graphs
discussed below.
We wanted to identify the differences between the two types of group members by
measuring their within-group behavior. To achieve that, we measured the following
data (presented in Figure 3). The X-axis of the figure is the time measured in tenth of
a second units. The Y-axes are different for each subplot as follows: (A) Detection of
proximity between each pair of visitors (Figure 3A). (B) Detection whether both
group members in each pair were in proximity to the same stationary Blind located
near exhibits in the triage (Figure 3B). (C) Identifying each pair of visitors as being at
the same location in the museum, as detected by proximity to Beacons in the museum
(Figure 3C). (D) Detecting voice activity of each group member (Figure 3D). Finally,
(E) Capturing the average orientation from visit start until any moment of the visit
(Figure 3E). This was done by using the 'sinus of the orientation' to compensate for
the cyclic nature of orientation (360̊ to 0̊), then summing the sinus value from the visit
start, and dividing it by the number of measurements (n) to get an average, normaliz-
ing the differences in number of measurements among group members. This was done
from the beginning of the visit until each tenth of a second of the visit. The motivation
for this measure is the assumption that there would be a better positive correlation of
sin(orientation) between two people that walk together and look at the same exhibits.
The measurements are anonymous, therefore they relate to visitor 1, visitor 2 and
visitor 3. The sensors' logs, compared with the videos taken and the demographic
data, show that the person carrying the Blind of visitor 1 was Peter and that Blinds of

visitors 2 and 3 were carried by Jane and Mary respectively. The results presented in
this example are valid only for this specific group and only for the Hecht Museum
visit.
All the measurements during the triage visit support the observation of the three
visitors. Jane and Peter were far more coordinated in their museum and social behav-
ior than each one of them was in regards to Mary. Column 3 in Table 1 shows these
results for the triage visit duration. The proximity metric (Figure 3A, first metric in
Fig. 3. Detecting group behavior
( Top three plots: '+': visitor 1&2; '*': visitor 1&3; 'o': visitor 2&3.
Two bottom plots: '+': visitor 1; '*': visitor 2; 'o': visitor 3; 'x': random)
Triage Start Triage End Visit End

Table 1) shows that Jane and Peter were detected together much more than each one
of them was detected together with Mary. The additional Blinds located near exhibits
in the triage (Figure 3B, Table 1 second metric) show that Jane and Peter shared more
time near the same exhibits. The next metric, detecting whether each pair of group
members are at the same location in the triage (Figure 3C, Table 1 third metric) shows
the same. Jane and Peter stayed together in specific locations longer than Mary did
with any one of them. One can also observe the contribution of the additoinal blinds
in the triage to better resolution in comparison to the location gained by the Beacons
from the comparison of Table 1 metrics 2 and 3. From the voice detection sensor
(Figure 3D, fourth metric in Table 1) it is clear that both Jane and Peter talked much
more than Mary, suggesting that they were involved in conversation. As for the
average(sin(orientation)) metric (Figure 3E) , the graphs of Jane and Peter correlate,
while Mary's graph deviates. These are also compared to a graph of
average(sin(orientation)) for random assignment of orientation (magenta 'x'), which
stays around the value of zero as expected. Pearson's product-moment correlation for
this measure supports this interpretation: as presented for each pair of visitors by the
fifth metric in Table 1.
Table 1. Measuring museum group visit behavior
Another question is how coherent are the triage results in comparison with the rest
of the visit results. The coherency is required to verify whether the triage results
predict the behavior during the rest of the visit. The results (Table 1 columns 4 and 5)
show a decrease in the difference between the coordinated pair (Jane and Peter) and
the other pairs, where Mary takes part. Still, it is a significant difference that shows
some level of coherency of the visitors' identity detected at the triage to their identity
during the rest of the museum visit. The causes for these differences are left to future
Metric
Visitor /
Combination
Pseudonym Triage
Rest of
the visit
Total
visit
Proximity
(% of the time)
Visitor 1&2 Peter&Jane 90 22.6 32.2
Visitor 1&3 Peter&Mary 3.2 13 12
Visitor 2&3 Jane&Mary 0.8 1.9 1.9
Being at the same triage
exhibit position
(% of the time)
Visitor 1&2 Peter&Jane 25 N/A N/A
Visitor 1&3 Peter&Mary 0.3 N/A N/A
Visitor 2&3 Jane&Mary 0.3 N/A N/A
Being at the same
Beacon position
(% of the time)
Visitor 1&2 Peter&Jane 16.2 9.4 10.6
Visitor 1&3 Peter&Mary 2.6 0.7 1
Visitor 2&3 Jane&Mary 2.3 0.8 1
Voice detection
(% of the time)
Visitor 1 Peter 9.9 7 7.3
Visitor 2 Jane 9 6 6.3
Visitor 3 Mary 1.1 1.6 1.5
Average(sin(orientation))
Pearson correlation "r"
Visitor 1&2 Peter&Jane +0.7 +0.2 +0.33
Visitor 1&3 Peter&Mary -0.23 -0.27 -0.26
Visitor 2&3 Jane&Mary -0.2 -0.18 -0.16

research. They may be caused by reasons such as the difference in the physical layout
between the triage (a corridor) and the rest of the museum (open space), musuem
fatigue or other social or personal causes.
Table 2. Measuring interest in exhibits
The above discussion relates to the social behavior of the group members, but how
can we show that Mary was less interested in exhibits? She could have separated from
the group, but still could have been interested in exhibits. Figure 4 shows that Mary
was less interested in the exhibits in the trigae, in comparison to the other group
members. There are three metrics in Figure 4: the top one presents if the visitor was
detected near a beacon; the middle one checks if the visitor was detected near a triage
Fig. 4. Detecting interest in exhibits ( '+': visitor 1; '*': visitor 2; 'o': visitor 3)
Metric
Visitor /
cCombination
Pseudonym Triage
Rest of
the visit
Total
visit
Being near a museum
Beacon
(% of the time)
Visitor 1 Peter 26.4 42.5 39.8
Visitor 2 Jane 30.6 41.5 39.6
Visitor 3 Mary 4.6 5.2 5.1
Being near a triage Blind
(% of the time)
Visitor 1 Peter 53.8 N/A N/A
Visitor 2 Jane 32.3 N/A N/A
Visitor 3 Mary 1.9 N/A N/A
Having orientation
towards a triage exhibit
(% of the time)
Visitor 1 Peter 59.5 N/A N/A
Visitor 2 Jane 52.5 N/A N/A
Visitor 3 Mary 9.5 N/A N/A
Triage Start Triage End Visit End

stationary blind; and the bottom one shows whether the visitor was oriented towards
an exhibit in the triage. Figure 4 as well as Table 2 (structured as Table 1) present the
detection results for each of the three metrics, and show that Mary spent little time
near museum exhibits, supporting the conclusion that she was not paying attention to
the museum exhibits from the beginning of his visit. As for coherency, it cannot be
analyzed, because two of the metrics are relevant only in the triage, and the one
relating to Beacons' detection depends on the Beacons' distribution in the musuem (a
person can be outside Beacons' detection and still watch an exhibit, which is not
detected by the Beacons).
The measured data may be used to assess the social behavior of the group of
visitors. A UM could have been used to identify Mary's state of mind, and a smart
visitor's guide may have been used to enhance Mary's visit experience.The UM could
identify the correlation between Jane and Peter, the time they spent by exhibits, and
let them enjoy the visit without interfering.
5 Summary
The triage concept relates to an area close to the entrance of a facility, equipped with
sensors that enable massive data collection. The data collected either refines an exist-
ing long term UM or builds a new, local UM if there is no access to the visitor's UM.
This concept has been demonstrated in a museum environment to reveal the museum-
visitors' identity. The updated UM is expected to enable adaptation and personaliza-
tion of services available in a specific facility, not necessarily limited to the museum.
Acknowledgements
The work was supported by the Israeli Science Foundation (ISF) grant 226/2010 and
by the collaboration project between the Caesarea-Rothschild Institute at the Univer-
sity of Haifa and FBK/irst and FIRB project RBIN045PXH
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