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Displaying 1-18 out of 18 total
Detecting a Gazing Region by Visual Direction and Stereo Cameras
Found in: Pattern Recognition, International Conference on
By Akihiro Sugimoto, Akihiro Nakayama, Takashi Matsuyama
Issue Date:August 2002
pp. 30278
We develop a wearable vision system that consists of a user's visual direction sensor and stereo cameras. First, we establish a method for calibrating the system so that it can detect user's blink points even in a real situation such that the depth of blin...
Compact and Accurate 3-D Face Modeling Using an RGB-D Camera: Let's Open the Door to 3-D Video Conference
Found in: 2013 IEEE International Conference on Computer Vision Workshops (ICCVW)
By Pavan Kumar Anasosalu,Diego Thomas,Akihiro Sugimoto
Issue Date:December 2013
pp. 67-74
We present a method for producing an accurate and compact 3-D face model in real time using a low cost RGB-D sensor like the Kinect camera. We extend and use Bump Images for highly accurate and low memory consumption 3-D reconstruction of the human face. B...
A Flexible Scene Representation for 3D Reconstruction Using an RGB-D Camera
Found in: 2013 IEEE International Conference on Computer Vision (ICCV)
By Diego Thomas,Akihiro Sugimoto
Issue Date:December 2013
pp. 2800-2807
Updating a global 3D model with live RGB-D measurements has proven to be successful for 3D reconstruction of indoor scenes. Recently, a Truncated Signed Distance Function (TSDF) volumetric model and a fusion algorithm have been introduced (KinectFusion), s...
Robust Simultaneous 3D Registration via Rank Minimization
Found in: 2012 Second International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission (3DIMPVT)
By Diego Thomas,Yasuyuki Matsushita,Akihiro Sugimoto
Issue Date:October 2012
pp. 33-40
We present a robust and accurate 3D registration method for a dense sequence of depth images taken from unknown viewpoints. Our method simultaneously estimates multiple extrinsic parameters of the depth images to obtain a registered full 3D model of the sc...
Illumination-free photometric metric for range image registration
Found in: Applications of Computer Vision, IEEE Workshop on
By Diego Thomas,Akihiro Sugimoto
Issue Date:January 2012
pp. 97-104
This paper presents an illumination-free photometric metric for evaluating the goodness of a rigid transformation aligning two overlapping range images, under the assumption of Lambertian surface. Our metric is based on photometric re-projection error but ...
Scale-Optimized Textons for Image Categorization and Segmentation
Found in: Multimedia, International Symposium on
By Yousun Kang,Akihiro Sugimoto
Issue Date:December 2011
pp. 257-262
Texton is a representative dense visual word and it has proven its effectiveness in categorizing materials as well as generic object classes. Despite its success and popularity, no prior work has tackled the problem of its scale optimization for a given im...
Semantic Segmentation and Object Recognition Using Scene-Context Scale
Found in: Image and Video Technology, Pacific-Rim Symposium on
By Yousun Kang, Hiroshi Nagahashi, Akihiro Sugimoto
Issue Date:November 2010
pp. 39-45
Scene-context plays an important role in scene analysis and object recognition. Among various sources of scene-context, we focus on scene-context scale, which means the effective region size of local context to classify an image pixel in a scene. This pape...
Incorporating Long-Term Observations of Human Actions for Stable 3D People Tracking
Found in: Motion and Video Computing, IEEE Workshop on
By Daisuke Sugimura, Yoshinori Kobayashi, Yoichi Sato, Akihiro Sugimoto
Issue Date:January 2008
pp. 1-7
We propose a method for enhancing the stability of tracking people by incorporating long-term observations of human actions in a scene. Basic human actions, such as walking or standing still, are frequently observed at particular locations in an observatio...
Recovering the Basic Structure of Human Activities from a Video-Based Symbol String
Found in: Motion and Video Computing, IEEE Workshop on
By Kris M. Kitani, Yoichi Sato, Akihiro Sugimoto
Issue Date:February 2007
pp. 9
In recent years stochastic context-free grammars have been shown to be effective in modeling human activities because of the hierarchical structures they represent. However, most of the research in this area has yet to address the issue of learning the act...
Globally Convergent Range Image Registration by Graph Kernel Algorithm
Found in: 3D Digital Imaging and Modeling, International Conference on
By Radim Šára, Ikuko Shimizu Okatani, Akihiro Sugimoto
Issue Date:June 2005
pp. 377-384
Automatic range image registration without any knowledge of the viewpoint requires identification of common regions across different range images and then establishing point correspondences in these regions. We formulate this as a graph-based optimization ...
Registration of Range Images that Preserves Local Surface Structures and Color
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By Ikuko Shimizu Okatani, Akihiro Sugimoto
Issue Date:September 2004
pp. 789-796
We propose an ICP-based registration method for range images that preserves fundamental features, i.e., local structures and color, of object surfaces. The method employs local surfaces as an attribute for establishing correspondences between range images ...
Reflectance Estimation from Motion under Complex Illumination
Found in: Pattern Recognition, International Conference on
By Fei Du, Takahiro Okabe, Yoichi Sato, Akihiro Sugimoto
Issue Date:August 2004
pp. 218-222
In this paper, we propose a method for recovering the reflectance properties of a moving Lambertian object from an image sequence of the object taken by a fixed camera under unknown, complex illumination. Our proposed method is based on the spherical-harmo...
Range Image Registration Preserving Local Structures of Object Surfaces
Found in: Pattern Recognition, International Conference on
By Ikuko Shimizu Okatani, Akihiro Sugimoto
Issue Date:August 2004
pp. 224-228
We propose a registration method for range images that preserves local structures of object surfaces. The method introduces shape patterns and a skewness of correspondences, both of which are extracted from the local surface nearby a point of interest in e...
Active Wearable Vision Sensor: Recognition of Human Activities and Environments
Found in: Informatics Research for Development of Knowledge Society Infrastructure, International Conference on
By Kazuhiko Sumi, Akihiro Sugimoto, Takashi Matsuyama, Masato Toda, Sotaro Tsukizawa
Issue Date:March 2004
pp. 15-22
To realize a symbiotic relationship between humans and computers, it is crucial to estimate the external and internal state of the human by observation. One promising approach is to acquire the same visual information as the human acquires. In this paper, ...
Multilinear Relationships between the Coordinates of Corresponding Image Conics
Found in: Pattern Recognition, International Conference on
By Akihiro Sugimoto, Takashi Matsuyama
Issue Date:September 2000
pp. 1550
This paper presents a study, based on conic correspondences, on the relationship between multiple images acquired by uncalibrated cameras. Representing image conics as points in the five-dimensional projective space allows us to handle image conics in the ...
Incorporating visual field characteristics into a saliency map
Found in: Proceedings of the Symposium on Eye Tracking Research and Applications (ETRA '12)
By Kazuo Hiraki, Akihiro Sugimoto, Hideyuki Kubota, Takahiro Okabe, Yoichi Sato, Yusuke Sugano
Issue Date:March 2012
pp. 333-336
Characteristics of the human visual field are well known to be different in central (fovea) and peripheral areas. Existing computational models of visual saliency, however, do not take into account this biological evidence. The existing models compute visu...
Saliency-based image editing for guiding visual attention
Found in: Proceedings of the 1st international workshop on pervasive eye tracking & mobile eye-based interaction (PETMEI '11)
By Aiko Hagiwara, Akihiro Sugimoto, Kazuhiko Kawamoto
Issue Date:September 2011
pp. 43-48
The most important part of an information system that assists human activities is a natural interface with human beings. Gaze information strongly reflects the human interest or their attention, and thus, a gaze-based interface is promising for future usag...
An interactive braille-recognition system for the visually impaired based on a portable camera
Found in: CHI '05 extended abstracts on Human factors in computing systems (CHI '05)
By Akihiro Sugimoto, Etsuya Shibayama, Shin Takahashi, Yoshiyuki Mihara
Issue Date:April 2005
pp. 1653-1656
We develop an interactive Braille-recognition system using a portable camera for visually impaired persons who cannot read Braille. Our system helps them to find and then push a desired button, as is necessary when using an elevator or a ticket vending mac...