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1,191 results on '"Ishikawa, Masatoshi"'

1. Virtual Inverse Perspective Mapping for Simultaneous Pose and Motion Estimation

Author

Hirano, Masahiro, Senoo, Taku, Kishi, Norimasa, and Ishikawa, Masatoshi

Subjects
Computer Science - Robotics, Computer Science - Computer Vision and Pattern Recognition
Abstract

We propose an automatic method for pose and motion estimation against a ground surface for a ground-moving robot-mounted monocular camera. The framework adopts a semi-dense approach that benefits from both a feature-based method and an image-registration-based method by setting multiple patches in the image for displacement computation through a highly accurate image-registration technique. To improve accuracy, we introduce virtual inverse perspective mapping (IPM) in the refinement step to eliminate the perspective effect on image registration. The pose and motion are jointly and robustly estimated by a formulation of geometric bundle adjustment via virtual IPM. Unlike conventional visual odometry methods, the proposed method is free from cumulative error because it directly estimates pose and motion against the ground by taking advantage of a camera configuration mounted on a ground-moving robot where the camera's vertical motion is ignorable compared to its height within the frame interval and the nearby ground surface is approximately flat. We conducted experiments in which the relative mean error of the pitch and roll angles was approximately 1.0 degrees and the absolute mean error of the travel distance was 0.3 mm, even under camera shaking within a short period.

Published
2023

9. Going Beyond Computer-Assisted Vocabulary Learning: Research Synthesis and Frameworks

Author

Nehal Hasnine, Mohammad, Ishikawa, Masatoshi, Mouri, Kousuke, Kaneko, Keiichi, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Streitz, Norbert, editor, and Konomi, Shin'ichi, editor

Published
2020
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11. Vehicle Self-Position Estimation Using Lighting Recognition in Expressway Tunnel for Visual Inspection Flow.

Author

Moko, Yushi, Hiruma, Yuka, Hayakawa, Tomohiko, Ke, Yushan, Onishi, Yoshimasa, and Ishikawa, Masatoshi

Subjects
INSPECTION & review, TUNNELS, RAILROAD tunnels, EXPRESS highways, TRAFFIC estimation, GLOBAL Positioning System, RECOGNITION (Psychology)
Abstract

In this study, a stable and high-speed vision-based self-position estimation method was proposed that improves upon the existing method of lane detection by recognizing the lighting facilities that are installed in tunnels on Japanese expressways where GNSS cannot be used. In addition, we proposed a method for inspecting multiple cracks at once by estimating the self-position with the successful rate 75% in the traveling direction by counting the lighting with the successful rate 99.85%. The effectiveness of the method was verified by capturing images of cracks in an actual tunnel. The proposed method will enable more frequent inspections for tunnel cracks that lead to flaking while maintaining infrastructure safety, reducing costs, and improving tunnel visual inspection flow efficiency. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Outdoor Gesture Recognition System Using Accurate Absolute Position Coordinates

Author

Hayakawa, Tomohiko, Ishikawa, Masatoshi, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Liu, Ting, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, and Stephanidis, Constantine, editor

Published
2016
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31. Tracking of Overlapped Vehicles with Spatio-Temporal Shared Filter for High-Speed Stereo Vision

Author

Senoo, Taku, Konno, Atsushi, Wang, Yunzhuo, Hirano, Masahiro, Kishi, Norimasa, and Ishikawa, Masatoshi

Subjects
overlapping vehicles recognition, correlation filter, high-speed vision, visual tracking
Abstract

In this study, we propose a method for measuring the distance and velocity of overlapping vehicles using high-speed stereo vision. The method is based on the correlation filter called MOSSE and is improved by balancing the computation cost and accuracy using the features of high-frame-rate images. To achieve stable tracking, the tracking window was adjusted for each vehicle according to the vehicle distance and the overlapping state. Experiments on the images acquired by the cameras mounted on an actual vehicle were performed to validate the proposed method.

Published
2022

44. Reconstruction of 3D Surface and Restoration of Flat Document Image from Monocular Image Sequence

Author

Shibayama, Hiroki, Watanabe, Yoshihiro, Ishikawa, Masatoshi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lee, Kyoung Mu, editor, Matsushita, Yasuyuki, editor, Rehg, James M., editor, and Hu, Zhanyi, editor

Published
2013
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45. Digitization of Deformed Documents Using a High-Speed Multi-camera Array

Author

Watanabe, Yoshihiro, Itoyama, Kotaro, Yamada, Masahiro, Ishikawa, Masatoshi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lee, Kyoung Mu, editor, Matsushita, Yasuyuki, editor, Rehg, James M., editor, and Hu, Zhanyi, editor

Published
2013
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