2 PROBLEMS WITH PERSONAL
IMAGE ARCHIVING
While an increasing amount of people are building
their online photo albums with the aid of off the
shelf digital album tools as well as web album
hosting sites, an effective and semantic way of
retrieving context relevant images from the large
repository of personal digital archives has yet
appeared.
Previously, only commercial photograph
database can reach this scale. Hence little research
effort has been focused on large scale personal
photograph collections. At current stage, general
users tend to give simple text annotations based on
folders of photograph categorized by related subject,
event or date. But we can see a trend that the
number of digital photographs taken would soon
exceed the critical amount for being simply
manageable.
Without constant organizing efforts, allocating a
single photograph such as: “A photograph of mine
that was taken around 5 years ago with three other
friends in a beautiful coffee shop near the bank of
Seine River at Paris during my 10 day summer
vacation in Europe” would soon become a difficult
task similar to look for old time photos stacked on
shoeboxes. And it is almost impossible for any
individual to annotate each of their photographs
manually. (Platt , J. et al., 2002 ; Graham, A et al.,
2002)
Most people make more photographs while they
visit some new locations or during special events.
As a result, the spatial and temporal attributes of
personal digital photographs could contain some
very relevant context information which was not
addressed by most general purpose image archive
researches.
The burst structure within collections of personal
photographs tends to be recursive, while small bursts
exist within big bursts as shown in Figure 1. And
this recursive structure can be represented as a
cluster tree, where photographs are stored only at the
leaf nodes. (Graham, A et al., 2002)
In previous researches (Platt , J. et al., 2002 ;
Graham, A et al., 2002; Stent, A. et al., 2001), semi-
automatic event segmentation based on the recorded
time tags made possible by most recent image
devices were enabled. While our research
emphasizes the importance of an integrated
approach utilizing spatial information in addition to
the ready-to-retrieve temporal information, we have
designed metadata description architecture, DDDC
(Dozen Dimensional Digital Content) (Kuo, P.,
Aoki, T. and Yasuda, H., 2004), extended from
MPEG-7 multimedia description schema for
annotating personal digital assets.
We also proposed the concept of “Spatial and
Temporal Based Ontology” (Kuo, P., Aoki, T. and
Yasuda, H., 2004), constructed based on the special
pattern of personal photograph collections as we
argue that time and location are two most important
attributes in terms of personal photograph retrieval.
Figure 1: Personal Digital Photograph Clusters Tree
Structure.
3 SPATIAL AND TEMPORAL
COORDINATED ANNOTATION
Digital camera has become popular in the past few
years, which means, a majority of people have only
digital photograph collections accumulated within a
limited time span of a few years. If we envision a
continuous lifetime digital photograph archiving
process, one might recalls, for example, his or her
several trips to Paris a few years ago and one trip to
Tokyo during Christmas season, but could not
clearly memorize the exact year or dates.
Rodden, K., and Wood, K. talked about the two
most important features of an efficient, reliable and
well-designed system for managing personal photo-
graphs are: automatically sorting photos in
chronological order, and displaying a large number
of thumbnails at once. While people are familiar
with their own photographs, laborious and detailed
keywords annotating are not specifically motivated
for most people.
In addition to time, location has been argued as
one of the strongest memory clues when people are
recalling past events. In analyzing our prototype
database raw data, we also find that most folder
names contain words related to geographic
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