Faculty Profiles - Noboru Babaguchi

Papers - Noboru Babaguchi

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Real-time user position estimation in indoor environments using digital watermarking for audio signals Reviewed

Ryosuke Kaneto, Yuta Nakashima, Noboru Babaguchi

Proceedings - International Conference on Pattern Recognition 97 - 100 2010

In this paper, we propose a method for estimating the user position where a user is holding a microphone in an indoor environment using digital watermarking for audio signals. The proposed method utilizes detection strengths, which are calculated while detecting spread-spectrum-based watermarks. Taking into account delays and attenuation of the watermarked signals emitted from multiple loudspeakers and other factors, we construct a model of detection strengths. The user position is estimated in real-time using the model. The experimental results indicate that the user positions are estimated with 1.3 m of root mean squared error on average for the case where the user is static. We demonstrate that the proposed method successfully estimates the user position even when the user moves. © 2010 IEEE.

Modeling visual information by spatio-temporal patterns to analyze event tactic in sports video Reviewed

Keita Masui, Minh-Son Dao, Noboru Babaguchi

2010 2nd European Workshop on Visual Information Processing, EUVIP2010 198 - 203 2010

Although event detection in sports videos has been gaining some remarkable results, tools for exploring and exploiting these event clips on their own demands are far from user's expectation. In this paper, a novel method using spatio-temporal patterns to model visual information tailored to analyze event tactics in sports videos without tracking objects is introduced. The major contribution of the proposed method is to represent visual information by using a sequence of symbols. Each symbol represents a distribution of players in a certain period of time. By using these sequences, event tactics are detected, explained, and visualized to help users understand event tactics without watching whole clips. Moreover, users could query by an example or by a text to find all events sharing the same tactic. Thorough testing with over 100 goal clips in soccer domain demonstrates the superiority of the proposed method in terms of precision recall ratios. ©2010 IEEE.

NHK STRL at TRECVID 2009: Surveillance Event Detection and High-Level Feature Extraction Reviewed

M. Takahashi, Y. Kawai, M. Fujii, M. Shibata, N. Babaguchi, S. Satoh

Proc. of TREC Video Retrieval Evaluation (TRECVID) Workshop 2009.11

Digital Diorama: Real-Time Adaptive Visualization of Public Spaces Reviewed

T. Takehara, Y. Nakashima, N. Nitta, N. Babaguchi

Proc. of 1st International Conference on Security Camera Network, Privacy Protection and Community Safety (SPC2009) 2009.10

Security Analysis of Anonymous Communication System 3-Mode Net Against Collaborating Nodes Reviewed

K. Kono, S. Nakano, Y. Ito, N. Babaguchi

Proc. of 2009 APSIPA Annual Summit Conference(APSIPA ASC 2009) 105 - 110 2009.10

User and Device Adaptation in Summarizing Sports Videos Reviewed

Naoko Nitta, Noboru Babaguchi

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS E92D ( 6 ) 1280 - 1288 2009.6

Video summarization is defined as creating a video summary which includes only important scenes in the original video streams. In order to realize automatic video summarization, the significance of each scene needs to be determined. When targeted especially on broadcast sports videos, a play scene, which corresponds to a play, can be considered as a scene unit. The significance of every play scene can generally be determined based on the importance of the play in the game. Furthermore, the following two issues should be considered: 1) what is important depends on each user's preferences, and 2) the summaries should be tailored for media devices that each user has. Considering the above issues, this paper proposes a unified framework for user and device adaptation in summarizing broadcast sports videos. The proposed framework summarizes sports videos by selecting play scenes based on not only the importance of each play itself but also the users' preferences by using the metadata, which describes the semantic content of videos with keywords, and user profiles, which describe users' preference degrees for the keywords. The selected scenes are then presented in a proper way using various types of media such as video, image, or text according to device profiles which describe the device type. We experimentally verified the effectiveness of user adaptation by examining how the generated summaries are changed by different preference degrees and by comparing our results with/without using user profiles. The validity of device adaptation is also evaluated by conducting questionnaires using PCs and mobile phones as the media devices.

A New Linguistic-Perceptual Event Model for Spatio-Temporal Event Detection and Personalized Retrieval of Sports Video Reviewed

Minh-Son Dao, Sharma Ishan Nath, Noboru Babaguichi

IMAGE ANALYSIS AND PROCESSING - ICIAP 2009, PROCEEDINGS 5716 594 - 603 2009

This paper proposes a new linguistic-perceptual event model tailoring to spatio-temporal event detection and conceptual-visual personalized retrieval of sports video sequences. The major contributions of the proposed model are hierarchical structure, independence between linguistic and perceptual part, and ability of capturing temporal information of sports events. Thanks to these advanced contributions, it is very easy to upgrade model events from simple to complex levels either by self-studying from inner knowledge or by being taught from plug-in additional knowledge. Thus, the proposed model not only can work well in unwell structured environments but also is able to adapt itself to new domains without the need (or with a few modification) for external reprogramming, re-configuring and re-adjusting. Thorough experimental results demonstrate that events are modeled and detected with high accuracy and automation, and users' expectation of personalized retrieval is highly satisfied.

Matrix-based algorithm for integrating inheritance relations of access rights for policy generation Reviewed

Kazuhiro Kono, Yoshimichi Ito, Akihito Aoyama, Hiroaki Kamoda, Noboru Babaguchi

Journal of Information Processing 17 318 - 327 2009

This paper presents a matrix-based algorithm for integrating inheritance relations of access rights for generating integrated access control policies which unify management of various access control systems. Inheritance relations of access rights are found in subject, resource, and action categories. Our algorithm first integrates inheritance relations in each category, and next, integrates inheritance relations of all categories. It is shown that these operations can be carried out by basic matrix operations. This enables us to implement the integration algorithm very easily.

Psychological study for designing privacy protected video surveillance system: PriSurv Reviewed

Noboru Babaguchi, Takashi Koshimizu, Ichiro Umata, Tomoji Toriyama

Protecting Privacy in Video Surveillance 147 - 164 2009

Abstract As video surveillance systems are widely deployed, concerns continue to grow about invasion of privacy. We have built a privacy protected video surveillance system called PriSurv. Although PriSurv protects subject privacy using image processing, criteria of controlling the subject's visual information that is privacy-sensitive should be clarified. Visual information must be disclosed by considering the trade-off between privacy and security. The level of privacy-sensitive visual information that could be disclosed to a viewer is simply called disclosable privacy in this chapter. Disclosable privacy, which deeply involves the personal sense, is affected by many factors. A sense of privacy is individual, but in some cases it might have common factors. A sense of privacy is individual, but in some cases it might have common factors. In this chapter, we analyze what factors determine and affect disclosable privacy by applying statistical analysis to questionnaire-based experimental results. These results indicate that disclosable privacy is concerned with how much a subject has feeling of closeness to a viewer and expects the viewer's responsibility. They also show that disclosable privacy differs greatly by individuals. Reflecting the obtained findings in PriSurv's design, we adapt PriSurv to reflect a personal sense of privacy. © 2009 Springer London.

Preserving topological information in sub-trajectories-based representation for spatio-temporal trajectories indexing and retrieval Reviewed

Minh-Son Dao, Ishan Nath Sharma, Noboru Babaguchi

MM'09 - Proceedings of the 2009 ACM Multimedia Conference, with Co-located Workshops and Symposiums 641 - 644 2009

Trajectories of moving objects are known as one of the most important cues for understanding semantics in video data. Although there are a lot of significant researches dealing with trajectory analysis tailored to indexing and retrieval, several problems still remain. One of them is a trade-off between whole trajectory- and sub-trajectories- based methods. The former problem is that representing a trajectory as a whole is not appropriate for detecting similar patterns of the trajectory. In contrast, the latter is that even though some key portion of two trajectories share similar patterns, the whole trajectories may be totally different. Therefore, this paper proposes a novel method to optimize such trade-off. By representing a trajectory as a combination of sequence of "word" - each word's character represents one distinct feature extracted from sub-trajectories (i.e. segments), and a topological graph of trajectory's segments, the proposed method is shift and scale invariant, can handle occlusion and distortion, and can discover similar patterns among trajectories. Thorough comparisons with well-known methods demonstrate the superiority of the proposed method in terms of precision recall ratios. Copyright 2009 ACM.

Performance Analysis of Anonymous Communication System 3-Mode Net Reviewed

Kazuhiro Kono, Shinnosuke Nakano, Yoshimichi Ito, Noboru Babaguchi

FIFTH INTERNATIONAL CONFERENCE ON INFORMATION ASSURANCE AND SECURITY, VOL 2, PROCEEDINGS 593 - 596 2009

This paper analyzes the performance of 3-Mode Net (3MN), which is a new anonymous communication system proposed in [1]. In particular, we give the probability distributions of the number of relay nodes as well as the number of encryption required for communications. The expectations and variances of these two numbers are also given. These results enable us to grasp the influence of the probabilities of mode selections in 3MN. Numerical examples are also presented to illustrate these results.

Breaking the YASS Algorithm via Pixels and DCT Coefficients Analysis Reviewed

X. Yu, N. Babaguchi

Proc. of International Conference on Pattern Recognition (ICPR2008) 2008.12

Digital Diorama: Adaptive 3D Visualization System for Indoor Environment Reviewed

R. Yamaguchi, Y. Yamamoto, N. Nitta, Y. Ito, N. Babaguchi

Proc. of International Workshop on Sensig Web 17 - 24 2008.12

NHK STRL at TRECVID 2008: High-Level Feature Extraction and Surveillance Event Detection Reviewed

Y. Kawai, M. Takahashi, M. Sano, M. Fujii, M. Shibata, N. Yagi, N. Babaguchi

Proc. of TREC Video Retrieval Evaluation (TRECVID) Workshop 1 358 - 365 2008.11

Mining Temporal Information and Web-Casting Text for Automatic Sports Event Detection Reviewed

M. S. Dao, N. Babaguchi

Proc. of IEEE International Workshop on Multimedia Signal Processing (MMSP2008) 616 - 621 2008.10

Temporal video completion by inserting another video segment Reviewed

Ryota Shoji, Naoko Nitta, Noboru Babaguchi

Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers 62 ( 10 ) 1633 - 1640 2008.10

When a scene is recorded with a camcorder, there may be disruptions such as object interference or battery exhaustion resulting in missing segments in the recorded video. A temporal video completion method that inserts a video segment captured by another camera in the place of such a faulty segment is proposed. In the proposed method, a user initially uses an interface to select both faulty and preferred segments from videos captured by two different cameras. To minimize the visual difference at the transition points between the two videos, the most similar frames to those previous to and following the faulty segment are detected around both ends of the preferred segment as the start and the end frames of the inserted segment. Note that, in order to prevent artifacts as much as possible, the length of the inserted segment can be different from the length of the faulty segment. Visually plausible video completion is then achieved by smoothing the motion and color gaps between the transition frames and completing the missing regions by using spatio-temporal features of the video. Experiments were conducted to evaluate the visual plausibility of the completed videos by changing the distance between the camera and the recorded target or between two cameras.

Sensing Web Project - How to handle privacy information in sensor data - Reviewed

M. Minoh, K. Kakusho, N. Babaguchi

Proc. of 12th Intl. Conf. Information Processing and Management of Uncertainty in Knowledge-based Systems(IPMU08) 863 - 869 2008.6

_Privacy Protected Video Surveillance System Using Adaptive visual Abstraction Reviewed

K. Chinomi, N. Nitta, Y. Ito, N. Babaguchi

Proc. of Multimedia Modeling Conference (MMM2008) 144 - 154 2008.1

Isotropy-Based Steganalysis in Multiple Least Significant Bits Reviewed

X. Yu, N. Babaguchi, Y. Wang

_Security and Watermarking of Multimedia Contents X 6819 681913 - 681922 2008.1

A Fast and Effective Method to Detect Multiple Least Significant Bits Steganography Reviewed

Xiaoyi Yu, Noboru Babaguchi

APPLIED COMPUTING 2008, VOLS 1-3 1443 - 1447 2008

In this paper, we propose a fast and effective LSB steganalysis for detecting the existence of hidden message and estimating hidden message length when the embedding is performed using both of two distinct embedding paradigms in one or more than one LSB. The method is based on the analysis of image statistics and quadratic equation. Compared with weighted stego-image based method, Ker's method and Luo et.al.'s method, the detection accuracy is high. Experimental results and theoretical verification show that the proposed method is an effective method of LSB steganalysis.

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Papers - Noboru Babaguchi