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Protection and Utilization of Privacy Information via Sensing 招待

Noboru Babaguchi, Yuta Nakashima

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS E98D ( 1 ) 2 - 9 2015年1月

Our society has been getting more privacy-sensitive. Diverse information is given by users to information and communications technology (ICT) systems such as IC cards benefiting them. The information is stored as so-called big data, and there is concern over privacy violation. Visual information such as images and videos is also considered privacy-sensitive. The growing deployment of surveillance cameras and social network services has caused a privacy problem of information given from various sensors. To protect privacy of subjects presented in visual information, their face or figure is processed by means of pixelization or blurring. As image analysis technologies have made considerable progress, many attempts to automatically process flexible privacy protection have been made since 2000, and utilization of privacy information under some restrictions has been taken into account in recent years. This paper addresses the recent progress of privacy protection for visual information, showing our research projects: PriSurv, Digital Diorama (DD), and Mobile Privacy Protection (MPP). Furthermore, we discuss Harmonized Information Field (HIFI) for appropriate utilization of protected privacy information in a specific area.

Real-Time People Counting across Spatially Adjacent Non-Overlapping Camera Views 査読

R. Akai, N. Nitta, N. Babaguchi

Proc. of International Conference on Multimedia Modeling (MMM2015) 71 - 82 2015年1月

［解説］スポーツ放送2020年の夢招待

馬場口登

NHK技研 R&D ( 149 ) 2 - 3 2015年1月

Digital diorama: Privacy-preserving and intelligible sensing-based real-world content 査読

Naoko Nitta, Noboru Babaguchi

ITE Transactions on Media Technology and Applications 3 ( 3 ) 184 - 193 2015年

This paper proposes a sensing-based real-world content called Digital Diorama, which is a three-dimensional miniature model of the dynamically changing real world created from the real-time data continuously published over the Internet by stationary cameras distributed in public spaces. Digital Diorama is designed to preserve both the privacy of the monitored persons and the intelligibility of the content by superimposing the latest background images and human icons each of which represents a monitored person in the three-dimensional model. By using the data continuously published from 10 stationary cameras installed on one floor of a shopping mall, our prototype Digital Diorama browser was able to construct and dynamically update Digital Diorama in approximately 1 fps. The results of subjective evaluations indicated that utilizing appropriate human icons can improve the intelligibility of the content while preserving the privacy of the monitored persons.

Inter-Concept Distance Measurement with Adaptively Weighted Multiple Visual Features 査読

Kazuaki Nakamura, Noboru Babaguchi

COMPUTER VISION - ACCV 2014 WORKSHOPS, PT III 9010 56 - 70 2015年

Most of the existing methods for measuring the inter-concept distance (ICD) between two concepts from their image instances use only a single kind of visual feature extracted from each instance. However, a single kind of feature is not enough for appropriately measuring ICDs due to a wide variety of perspectives for similarity evaluation (e.g., color, shape, size, hardness, heaviness, and functions); the relationships between different concept pairs are more appropriately modeled from different perspectives provided by multiple kinds of features. In this paper, we propose extracting two or more kinds of visual features from each image instance and measuring ICDs using these multiple features. Moreover, we present a method for adaptively weighting the visual features on the basis of their appropriateness for each concept pair. Experiments demonstrated that the proposed method outperformed a method using only a single kind of visual feature and one combining multiple kinds of features with a fixed weight.

Real-Time Local Word Database Construction from Twitter 査読

Takuya Kamimura, Naoko Nitta, Noboru Babaguchi

2015 IEEE INTERNATIONAL CONFERENCE ON SMART CITY/SOCIALCOM/SUSTAINCOM (SMARTCITY) 299 - 306 2015年

Recently, geotagged posts to social media such as Twitter have been used to automatically construct a geographical dictionary containing diverse types of local words which indicate specific locations in the real world. The existing methods typically examine the spatial locality of the usage patterns observed in the geotagged posts accumulated for a certain period of time to select the local words; however, how long the geotagged posts need to be accumulated depends on the usage frequency of the word, and additionally, some local words can indicate different locations at different times. Thus, we propose a real-time method for constructing a local word database which consistently keeps the local words and their locations up to date by iteratively adding new local words, removing old temporary local words, and updating the locations indicated by the local words. These functions are realized by adaptively recording/resetting the usage history of each word to properly examine its spatial locality and by assigning the weight for each geotag which is used to represent the locations indicated by the local words according to their temporal variations. The local word database constructed by our proposed method was verified to contain more up-todate local words and locations compared to other types of geographical dictionary constructed by experts, crowdsourcing, and from the geotagged tweets accumulated for a fixed period of time based on the performance evaluations of tweet location estimation as an example of applications utilizing the geographical dictionaries.

単語間の関係性の経時変化を考慮したマイクロブログからの実世界観測情報の抽出査読

新田直子, 角谷直人, 馬場口登

日本データベース学会論文誌 vol.13-J ( no.1 ) 7 - 12 2014年10月

［招待講演］空間軸を限定したプライバシー情報保護活用基盤招待

馬場口登

2014年9月

［招待講演］空間を限定したプライバシー情報保護・活用基盤招待

馬場口登

2014年2月

［解説］センシングにおけるプライバシー情報の保護と利用招待

馬場口登

画像ラボ 25 ( 1 ) 1 - 6 2014年1月

Camera oscillation pattern for VSLAM: Translational versus rotational 査読

Mohamed Heshmat, Mohamed Abdellatif, Kazuaki Nakamura, A. A. Abouelsoud, Noboru Babaguchi

2014 International Conference on 3D Imaging, IC3D 2014 - Proceedings 2014年

Visual SLAM algorithms exploit natural scene features to infer the camera motion and build a map of the environment landmarks. SLAM algorithm has two interrelated processes localization and mapping. For accurate localization, we need the features location estimates to converge quickly. On the other hand, to build an accurate map, we need accurate localization. Recently, a biologically inspired approach exploits deliberate camera oscillation has been used to improve the convergence speed of depth estimate. In this paper, we explore the effect of camera oscillation pattern on the accuracy of VSLAM. Two main oscillation patterns are used for distance estimation: translational and rotational. Experiments, using static and moving robot, are made to explore the effect of these oscillation patterns on the VSLAM performance.

Dynamic feature detection using virtual correction and camera oscillations 査読

Mohamed Heshmat, Mohamed Abdellatif, Kazuaki Nakamura, A. A. Abouelsoud, Noboru Babaguchi

2014 International Conference on 3D Imaging, IC3D 2014 - Proceedings 2014年

Visual SLAM algorithms exploit natural scene features to infer the camera motion and build a map of a static environment. In this paper, we relax the severe assumption of a static scene to allow for the detection and deletion of dynamic points. A new 'virtual correction' method is introduced which serves to detect the dynamic points by checking the re-projection error of the points before and after the virtual measurement update. It can also recover the erroneously excluded useful features, particularly the distant points which may be deleted because of the change in its position after new measurement observation. Deliberate camera oscillations are also used to improve the VSLAM accuracy and the camera observability. The simulation results showed the effectiveness of the virtual correction when combined with camera oscillation in recovering the misclassified features and detecting the dynamic features even in difficult scenarios.

Real-world event detection using Flickr images 査読

Naoko Nitta, Yusuke Kumihashi, Tomochika Kato, Noboru Babaguchi

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 8326 ( 2 ) 307 - 314 2014年

This paper proposes a real-world event detection method by using the time and location information and text tags attached to the images in Flickr. Events can generally be detected by extracting images captured at the events which are annotated with text tags frequently used only in specific times and locations. However, such approach can not detect events where only a small number of images were captured. We focus on the fact that semantically related events often occur around the same time at different locations. Considering a group of these events as an event class, the proposed method firstly detects event classes from all images in Flickr based on their similarity of the captured time and text tags. Then, from the images consisting each event class, events are detected based on their similarity of the captured locations. Such two-step approach enables us to detect events where a small number of images were captured. © 2014 Springer International Publishing.

［招待講演］センシングにおけるプライバシー情報の保護と利用招待

馬場口登

2013年12月

Special Issue on Intelligent Video Surveillance for Public Security and Personal Privacy 招待

Noboru Babaguchi, Andrea Cavallaro, Rama Chellappa, Frederic Dufaux, Liang Wang

IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY 8 ( 10 ) 1559 - 1561 2013年10月

［解説］プライバシー考

馬場口登

特別寄稿, NTT Docomo テクニカル・ジャーナル 21 ( 3 ) 4 - 5 2013年8月

[Invited Speech] Protection and Utilization of Privacy Information 招待

N. Babaguchi

2013年7月

[Keynote Speech] Example-Based Remixing of Multimedia Contents 招待

N. Babaguchi

1st International Workshop on Media Fragment Creation and reMIXing (MMIX'13, Co-located WS at ICME2013) 2013年7月

［招待講演］プライバシー情報保護活用基盤「開示と利益が調和する知的空間」招待

馬場口登

2013年7月

［招待講演］センシングで得られるプライバシー情報の保護と利用招待

馬場口登

PRMU2013-22 PRMU2013 ( 22 ) 17 - 22 2013年6月

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