Faculty Profiles - Deguchi Daisuke

Presentations -

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Low resolution QR-code recognition by applying super-resolution using the property of QR-codes International conference

Yuji Kato, Daisuke Deguchi, Tomokazu Takahashi, Ichiro Ide, Hiroshi Murase

11th International Conference on Document Analysis and Recognition (ICDAR2011) 2011.9.20

Event date： 2011

Language：English Presentation type：Oral presentation (general)

Venue：Beijing, China

This paper proposes a method for low resolution QR-code recognition. A QR-code is a two-dimensional binary symbol that can embed various information such as characters and numbers. To recognize a QR-code correctly and stably,the resolution of an input image should be high. In practice,however, recognition of a QR-code is usually difficult due to
low resolution when it is captured from a distance. In this paper, we propose a method to improve the performance of low resolution QR-code recognition by using the super-resolution technique that generates a high resolution image from multiple low-resolution images. Although a QR-code is a binary pattern, it is observed as a grayscale image due to the degradation through the capturing process. Especially the pixels around the borders between white and black regions become ambiguous. To overcome this problem, the proposed method introduces a binary pattern constraint to generate super-resolved images appropriate for recognition. Experimental results showed that a recognition rate of 98% an be achieved by the proposed method, which is a 15.7% improvement in comparison with a method using a conventional super-resolution method.

A Study of Robust Multi-Frame Super Resolution for Non-Rigid Deformation of Face

Tomonari Yoshida, Tomokazu Takahashi, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase

IEICE Technical Report (PRMU) 2011.9.6

大局的特徴として顕著性を利用した歩行者の視認性推定

若山雅史, 道満恵介, 出口大輔, 井手一郎, 村瀬洋, 玉津幸政

画像の認識・理解シンポジウム(MIRU) 2011.7.22

車載カメラ映像中の線分の3次元位置推定と走行可能領域検出への応用

内山寛之, 高橋友和, 出口大輔, 井手一郎, 村瀬洋

画像の認識・理解シンポジウム(MIRU) 2011.7.22

Event date： 2011

Language：Japanese Presentation type：Poster presentation

Venue：石川県金沢市金沢市文化ホール

走行可能領域検出は車両のナビゲーションや安全運転支援において重要である．市街地の構造物の多くはポールや壁面といった線分で構成されている．そこで本論文では，走行可能領域検出を目的とし，単眼カメラを用い
て市街地の線分の3次元位置推定を行う手法を提案する．カメラの姿勢が既知の場合，線分の位置を推定するためには，画像間の線分の正確な対応付けが必要となる．そのため，少数の画像間で正しい線分の対応付けを行うために，多視点幾何拘束や市街地中の線分の特徴，車両の動きの事前知識を用いる．評価実験において，推定した線分の位置から走行可能領域の検出を行い，提案手法が走行可能領域検出に十分利用可能であることを確認した．

車載カメラ画像からの高品質な道路画像の自動構築

野田雅文, 高橋友和, 出口大輔, 井手一郎, 村瀬洋, 小島祥子, 内藤貴志

画像の認識・理解シンポジウム(MIRU) 2011.7.22

Estimation of traffic sign visibility with in-vehicle camera images using temporal information

Keisuke Doman, Daisuke Deguchi, Tomokazu Takahashi, Yoshito Mekada, Ichiro Ide, Hiroshi Murase, Yukimasa Tamatsu

14th Meeting on Image Recognition & Understanding (MIRU2011) 2011.7.22

現在と過去の車載カメラ映像のフレーム間対応付け

久徳遙矢, 出口大輔, 高橋友和, 目加田慶人, 井手一郎, 村瀬洋

画像の認識・理解シンポジウム(MIRU) 2011.7.21

Event date： 2011

Language：Japanese Presentation type：Poster presentation

Venue：金沢市文化ホール

本研究では，車載カメラ映像を用いた運転者支援に注目する．その際，同じ道路で撮られた過去の映像中の対応するフレームを求める事が可能になれば，様々な用途に使うことができると考えられる．そこで本稿では，高精度な現在と過去の車載カメラ映像中のフレーム間対応付け手法を提案する．同じ道路で撮られた映像同士の対応付けであっても，走行は全く同じ速度・軌跡ではないため，単純な画像照合による対応付けは困難である．そこで，まず現在と過去のフレーム間で対応点を求め，それらからフレーム間の基礎行列を求める．次に，基礎行列から求めたエピポールの位置に基づくフレーム間の距離を定義し，この尺度を用いたDP マッチングにより，フレーム同士を対応付ける．実際の車載カメラ映像を用いた評価実験の結果，提案手法の有効性を確認した．

On-road Obstacle Detection by Comparing Present and Past In-vehicle Camera Images International conference

Haruya Kyutoku, Daisuke Deguchi, Tomokazu Takahashi, Yoshito Mekada, Ichiro Ide, Hiroshi Murase

IAPR Conference on Machine Vision Applications (MVA) 2011 2011.6.14

Estimation of Traffic Sign Visibility Considering Temporal Environmental Changes for Smart Driver Assistance International conference

Keisuke Doman, Daisuke Deguchi, Tomokazu Takahashi, Yoshito Mekada, Ichiro Ide, Hiroshi Murase, Yukimasa Tamatsu

2011 IEEE Intelligent Vehicles Symposium (IV2011) 2011.6.7

Event date： 2011

Language：English Presentation type：Poster presentation

Venue：Baden-Baden, Germany

We propose a visibility estimation method for traffic signs considering temporal environmental changes, as a part of work for the realization of nuisance-free driver assistance systems. Recently, the number of driver assistance systems in a vehicle is increasing. Accordingly, it is becoming important to sort out appropriate information provided from them, because providing too much information may cause driver distraction. To solve such a problem, we focus on a visibility estimation method for controlling the information according to the visibility of a traffic sign. The proposed method sequentially captures a traffic sign by an in-vehicle camera, and estimates its accumulative visibility by integrating a series of instantaneous visibility. By this way, even if the environmental conditions may change temporally and complicatedly, we can still accurately estimate the visibility that the driver perceives in an actual traffic scene. We also investigate the performance of the proposed method and show its effectiveness.

Road Image Update using In-vehicle Camera Images and Aerial Image International conference

Masafumi Noda, Tomokazu Takahashi, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase, Yoshiko Kojima, Takashi Naito

2011 IEEE Intelligent Vehicles Symposium (IV2011) 2011.6.7

Event date： 2011

Language：English Presentation type：Poster presentation

Venue：Baden-Baden, Germany

Road image is becoming important for several
applications such as car navigation systems, traffic environment
research, city modeling. Usually, a road image can be obtained
from an aerial image but the resolution of the aerial image is
often low, or it contains occlusions by obstacles. Therefore, the
update of road image is required. In this paper, we propose a
road image mosaicing method using in-vehicle camera images
and an aerial image. We first perform image registration of road
regions between these images, and then, we generate a large road
image by performing image mosaicing of road regions in invehicle
camera images. In an experiment, we achieved resolution
improvement and occlusions removal, and also succeeded in
update of a large road image.

3-D Line Segment Reconstruction Using an In-Vehicle Camera for Free Space Detection International conference

Hiroyuki Uchiyama, Daisuke Deguchi, Tomokazu Takahashi, Ichiro Ide, Hiroshi Murase

2011 IEEE Intelligent Vehicles Symposium (IV2011) 2011.6.6

Event date： 2011

Language：English Presentation type：Poster presentation

Venue：Baden-Baden, Germany

Free space detection is very important for vehicle navigation and safe driving. 3-D line segment reconstruction
of a street is important for the free space detection because a street-view includes many line segments. For the free space
detection, we propose a method for reconstructing 3-D line segments in a streetscape using a monocular in-vehicle camera.
The 3-D reconstruction of the line segments is achieved by using each three images from an image sequence. Once accurate
camera poses of these images are obtained, one of the remaining crucial problems is to match the line segments between the
images correctly. A strategy for finding correspondence of the line segments is as follows: First, the correspondences of line
segment candidates are searched by using a two-view constraint. However, the two-view constraint has difficulty on determining
an unique correspondence geometrically. Therefore, the candidates of the line segment correspondences are reduced using
a three-view constraint. In order to improve the accuracy, the proposed method exploits a color feature of the line segment
and a preliminary knowledge of the vehicle motion. Finally, the line segments are reconstructed using the correspondences.
From an experimental result, we confirmed the effectiveness of the proposed method. Application to the free space detection
demonstrated the usefulness of the reconstructed line segments.

Intelligent Traffic Sign Detector: Adaptive Learning Based on Online Gathering of Training Samples International conference

Daisuke Deguchi, Mitsunori Shirasuna, Keisuke Doman, Ichiro Ide, Hiroshi Murase

2011 IEEE Intelligent Vehicles Symposium (IV2011) 2011.6.6

Event date： 2011

Language：English Presentation type：Poster presentation

Venue：Baden-Baden, Germany

This paper proposes an intelligent traffic sign detector using adaptive learning based on online gathering of training samples from in-vehicle camera image sequences. To detect traffic signs accurately from in-vehicle camera images, various training samples of traffic signs are needed. In addition, to reduce false alarms, various background images should also be prepared before constructing the detector. However, since their appearances vary widely, it is difficult to obtain them exhaustively by manual intervention. Therefore, the proposed method simultaneously obtains both traffic sign images and background images from in-vehicle camera images. Especially, to reduce false alarms, the proposed method gathers background images that were easily mis-detected by a previously constructed traffic sign detector, and re-trains the detector by using them as negative samples. By using retrospectively tracked traffic sign images and background images as positive and negative training samples, respectively, the proposed method constructs a highly accurate traffic sign detector automatically. Experimental results showed the effectiveness of the proposed method.

GPGPUによる高速画像処理

出口大輔

日本ロボット学会ロボット工学セミナー第62回シンポジウム「ロボットに使える画像処理技術の最前線」 2011.5.30

Event date： 2011

Language：Japanese Presentation type：Oral presentation (general)

Venue：東京大学武田先端知ビル5F 武田ホール

GPUを汎用計算に利用しようという試みであるGPGPU（General Purpose computing on GPUs）は，近年のGPUの高性能化およびその入手しやすさという特徴から，幅広い分野で高速計算に利用されるようになってきた．一方，画像処理アルゴリズムの多くは並列計算可能なものが多く，少しアルゴリズムを工夫することでCPUの数十倍の高速化を達成できるものも多く存在する．そこで，本講演ではGPGPUを手軽に利用できるCUDAを開発環境として利用し，実例を交えながら計算コストの高い画像処理を簡単に高速化できることを示す．

A Study on Road Image Generation by Mosaicing of In-Vehicle Camera Images Using Aerial Image as a Reference

Masafumi Noda, Tomokazu Takahashi, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase, Yoshiko Kojima, Takashi Naito

IEICE Technical Report (PRMU) 2011.5.20

Matching Motions in Remote Cooperative Cooking Videos Using a Position-invariant Motion Feature

Yasuhiro Hayashi, Hiroyuki Uchiyama, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase

IEICE Technical Report (MVE) 2011.3

Prediction of driving behavior using driver's gaze information

Tatsuki Kamisaka, Masafumi Noda, Yoshito Mekada, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase

IEICE Technical Report (PRMU) 2011.5.20

Detection of Inconsistency between Face and Speaker Focusing on the Co-occurrence of Lip Motion and Audio

Shogo Kumagai, Keisuke Doman, Tomokazu Takahashi, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase

IEICE Technical Report (MVE) 2011.5.14

A study on facial pose transformation based on learning-based local image transformation

Yuki Kono, Tomokazu Takahashi, Daisuke Deguchi, Ichiro Ide, Hiroshi Murase

IEICE Technical Report (PRMU) 2011.3.1

A Report on MIRU2010 Young Researchers' Program

Toru Tamaki, Yuko Uematsu, Kazuaki Kondo, Tomoya Sakai, Atsushi Shimada, Daisuke Deguchi, Takayoshi Yamashita

IEICE Technical Report (PRMU) 2011.3

A study on a method to predict driving behavior using gaze information

Tatsuki Kamisaka, Masafumi Noda, Daisuke Deguchi, Yoshito Mekada, Ichiro Ide, Hiroshi Murase

2011 IEICE General Conference 2011.3

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