|
This paper proposes a method that identifies and tracks a walking human across discontinuous fields of views of
multiple cameras for the purpose of video surveillance. A typical video surveillance system has multiple cameras, but
there are several spaces within the surveillance area that are not within any of the camera's field of view. Also, there are
discontinuities between the fields of views of adjacent cameras. In such a system, humans need to be tracked across
discontinuous fields of views of multiple cameras. Our proposed model addresses this issue using the concepts of gait
pattern, gait model, and motion signature. Each human's gait pattern is constructed and stored in a database. This gait
pattern spans a tensor space that consists of three dimensions: person, image feature, and spatio-temporal data. A
human's gait model can be constructed from the gait pattern using the "tensor decomposition based approach" described
in this paper. When human(s) appears in one of the camera's field of a view (which is often discontinuous from the other
camera's field of views), the human's motion signature is calculated and compared to each person in the database's gait
model. The person with the gait model that is most similar to the motion signature is identified as same person. After the
person is identified, the person is tracked within the field of view of the camera using the mean-shift algorithm based on
color parameters. We conducted two experiments; the first experiment was identifying and tracking humans in a single
video sequence, and experiments, the percentage of subjects that were correctly identified and tracked was better than
that of two currently widely-used methods, PCA and nearest-neighbor. In the second experiment was the same as the
first experiment but consisted of multiple-cameras with discontinuous views. The second experiment (human tracking
across discontinuous images), shows the potential validity of the proposed method in a typical surveillance system.
|
