Mr. Takayuki Hori Profile

Takayuki Hori

PhD Student

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Publications (3)

Proceedings Article | 8 February 2011 Paper

Study of recognizing human motion observed from an arbitrary viewpoint based on decomposition of a tensor containing multiple view motions

Takayuki Hori, Jun Ohya, Jun Kurumisawa

Proceedings Volume 7873, 787310 (2011) https://doi.org/10.1117/12.872300

KEYWORDS: Databases, Data modeling, Motion models, Machine vision, Computer vision technology, Video, Surveillance, Matrices, Detection and tracking algorithms, Motion analysis

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Proceedings Article | 27 January 2010 Paper

Identifying a walking human by a tensor decomposition based approach and tracking the human across discontinuous fields of views of multiple cameras

Takayuki Hori, Jun Ohya, Jun Kurumisawa

Proceedings Volume 7533, 75330X (2010) https://doi.org/10.1117/12.838717

KEYWORDS: Cameras, Gait analysis, Motion models, Video, Principal component analysis, Imaging systems, 3D modeling, Databases, Video surveillance, Surveillance

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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.

Proceedings Article | 11 February 2009 Paper

Comparative study of methods for recognition of an unknown person's action from a video sequence

Takayuki Hori, Jun Ohya, Jun Kurumisawa

Proceedings Volume 7245, 72450V (2009) https://doi.org/10.1117/12.805745

KEYWORDS: Video, Databases, Principal component analysis, Machine vision, Computer vision technology, Matrices, Motion analysis, Surveillance, Feature extraction, Detection and tracking algorithms

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