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1 Consideration of the Head Movement Model for a Robot in Group Discussion Context Seiya Kimura 1 Hung-Hsuan Huang 2 Shogo Okada 3 Naoki Ohta 2 Kazuhiro Kuwabara College of Information Science and Engineering Ritsumeikan University 2 2 Graduate School of Information Science and Engineering Ritsumeikan University 3 3 School of Information Science Japan Advanced Institute of Science and Technology Abstract: 2 3 SVM(Support Vector Machine) F-Measure EU TARDIS 1 1 [5 6 3]

2 2 1 2 [13] 2D 3D / [2] [4 7] [1] [8] Schiavo [9] [11]

3 図 1: 実験環境 3.2 実験環境 実験参加者が 1.2m 1.2m の正方形のテーブルの 周りに座って議論を行う様子を 2 つのビデオカメラ と様々なセンサを使用して記録した 各参加者は 頭に 加速度センサー ATR-Promotions TSND121 とオー ディオデジタイザ Roland Sonar X1 LE に接続された ヘッドセットマイク Audio-Technica HYP-190H を 装着し ウェブカメラ Logicool C920 を 4 台使用し 各参加者の顔を撮影した また モーションキャプチャ OptiTrack Flex 3 with 8 台のカメラ と Microsoft Kinect センサーを使用して 参加者の上半身の動きを 記録した 記録実験の設定を図 1 に示す 実験の結果 15 分 10 グループ= 150 分間のグループディスカッ ションデータが記録された Praat1 による分析の結 果 このコーパスの統計情報は以下のようになった 各 セッションで平均 発話 最大 913 最小 570 標 準偏差 発声の長さは 秒 最大 10.6 最小 0.2 標準偏差 頭部動作モデル 行ったグループディスカッションデータ収集実験にお ける参加者の注目可能なターゲットは主に他の参加者 と配布した資料 (今回の実験では有名人リスト) とみな すことができる 各参加者の視点から見ると左側に座っ ている参加者 テーブルの反対側に座っている参加者 右側に座っている参加者の 3 人がいる それらの参加 者をそれぞれ left front right とし アテンション対 象として定義する また 資料がテーブル上に置かれ ており参加者の視線がテーブル方向に向いていた場合 テーブルを見ているのか資料を見ているのは判別が困 難であるため それらを一様に table として定義する これらの定義にアノテーションツール Elan [12] を使用 してビデオコーパスによってすべての参加者のアテン ション対象を手動でアノテーションを行った また ア ノテーションを行う者がアテンション対象を判断でき なかった場合のクラスである away を定義した 表 1 にアノテーションの結果を示す 結果から参加者は table へ最も頻繁かつ最も長くアテンションを向けてい ることが観察された これは参加者が議論をしている 間 有名人リストを見ている時間が長くなっていたこ とが要因としてあげられる また 他の参加者へ向け られたアテンションの中でもテーブルの反対側に座っ ている参加者へ頻繁にアテンションを向けいるが 左 右の参加者での明らかな違いは認められなかった そ して away クラスは他のクラスに比べてインスタンス 数がはるかに少ないという結果になった 表 1: 全参加者のアテンション対象ラベルデータ クラス 個数 平均継続時間 最大継続時間 最小継続時間 table 秒 359 秒 0.38 秒 front 秒 31 秒 0.18 秒 right 秒 30 秒 0.18 秒 left 秒 25 秒 0.11 秒 away 秒 4秒 0.10 秒 アテンション対象モデル この研究ではエージェントの視線方向や頭部の向き のとの全体的な組み合わせをアテンション対象として 扱う これは人工的なエージェントはアクチュエータ が人間と同じように機能しないことに起因する 特に ロボットの場合 人間よりも自由度がはるかに低く 人 間のようにスムーズに動く可動式の眼球もない その ため我々は詳細に人間の動きを模倣したものより よ り単純で抽象的かつ装置に依存しないアテンション対 象モデルの生成を今回の研究課題とした 今回我々が 頷き区間モデル 頷きはそれを行う者によって多様な表現方法があり 速さや角度などについても様々である また アテン ション対象モデルと同様のエージェントの自由度やス ムーズによる問題から頷き区間モデルにおいても装置 に依存しないモデルの生成を行う そのためこの頷き区 間モデルでは頷きの方法や速さ 角度に関わらずエー ジェントがグループディスカッションの中で頷きを行う

4 nod nomal Elan 2 2: nomal nod Speaking Listening Idling : 2 front me 5.2 ( ) 2 away left front right table t (A) x 5 15

5 t (t ) t (t ) (S) Praat x t (t ) t (t ) Speaking Listening Idling (P) Praat 12 3 x t (t ) t (t ) (t ) t (t ) t (t ) t (t ) t (t ) (B) x t (t ) 0.1 t (t ) t 0.1 (t ) 5.3 SVM Support Vector Machine 2 3 SVM C 0.5 1, RBF 0.001, C = 10.0 = 0.01 table front nomal nod Leave-one-person-out

6 Speaking Listening Idling B Speaking Listening Idling 3: Idling 1 10 F-measure( ) 4: Listening 1 10 F-measure( ) 5: Speaking 1 10 F-measure( ) Idling (B) 3 F-Measure F-Measure A S P B F-Measure F-Measure Precision Recall F-measure 3 table front 2 table front 2

7 3: ( ) A S P B Idling Listening Speaking Idling Listening Speaking : Idling 1 10 F-measure( ) 7: Listening 1 10 F-measure( ) 4: Precision Recall F-measure table front Idling right left table front Listening right left table front Speaking right left Listening>Idling>Speaking Speaking 5.4 8: Speaking 1 10 F-measure( )

8 9: F-measure 10: F-measure 5: Precision Recall F-measure nomal Idling nod nomal Listening nod nomal Speaking nod SVM F-Measure MFCC

9 VR [1] Catharine Oertel, Jose Lopes, Yu Yu, Kenneth A. Funes Mora, Joakim Gustafson, Alan W. Black, and Jean-Marc Odobez Towards building an attentive artificial listener:on the perception of attentiveness in audio-visual feedback tokens,in 18th ACM International Conference on Multimodal Interaction, pp (2016) [2],,,,, HAI 2015, pp (2015) [3] Tobias Baur, Ionut Damian, Patrick Gebhard, Kaska Porayska-Pomsta, and Elisabeth Andre A Job Interview Simulation: Social Cue-based Interaction with a Virtual Character, In 2013 International Conference on Social Computing, pp (2013) [4] Iolanda Leite, Marissa McCoy, Monika Lohani, Daniel Ullman, Nicole Salomons, Charlene Stokes, Susan Rivers, and Brian Scassellati Emotional Storytelling in the Classroom: Individual versus Group Interaction between Children and Robots. In 10th ACM/IEEE International Conference on Human-Robot Interaction, pp (2015) [5] Mathieu Chollet, Magalie Ochs, and Catherine Pelachaud Mining a Multimodal Corpus for Non- Verbal Signals Sequences Conveying Attitudes. In The 9th edition of the Language Resources and Evaluation Conference, pp (2014) [6] Hazael Jones, Mathieu Chollet, Magalie Ochs, Nicolas Sabouret, and Catherine Pelachaud Expressing social attitudes in virtual agents for social coaching, Proceedings of the 2014 international conference on Autonomous agents and multi-agent systems, pp (2014) [7] Marynel Vazquez, Elizabeth J. Carter, Braden McDorman, Jodi Forlizzi Aaron Steinfeld, and Scott E. Hudson Towards Robot Autonomy in Group Conversations: Understanding the Effects of Body Orientation and Gaze, Proceedings of the 2017 ACM/IEEE International Conference on Human-Robot Interaction, pp (2017) [8] Shogo Okada, Yukiko Nakano, Yuki Hayashi, Yutaka Takase, and Katsumi Nitta Estimating Communication Skills using Dialogue Acts and Nonverbal Features in Multiple Discussion Datasets, In 18th ACM International Conference on Multimodal Interaction, pp (2016) [9] Gianluca Schiavo, Alessandro Cappelletti, Eleonora Mencarini, Oliviero Stock, and Massimo Zancanaro Overt or Subtle? Supporting Group Conversations with Automatically Targeted Directives, In Proceedings of the 19th international conference on Intelligent User Interfaces, pp (2014) [10] Catharine Oertel, Jose Lopes, Yu Yu, Kenneth A. Funes Mora, Joakim Gustafson, Alan W. Black, and Jean-Marc Odobez Towards building an attentive artificial listener: on the perception of attentiveness in audio-visual feedback tokens. In 18th ACM International Conference on Multimodal Interaction, pp (2016) [11] Fumio Nihei, Yukiko I. Nakano, Yuki Hayashi, Hung-Hsuan Huang, and Shogo Okada Predicting Influential Statements in Group Discussions using Speech and Head Motion Information. In Proceedings of the 16th International Conference on Multimodal Interaction, pp (2014) [12] Hedda Lausberg and Han Sloetjes, Coding gestural behavior with the NEUROGES-ELAN system, Behavior Research Methods 41, pp (2009) [13] Osamu Morikawa and Takanori Maesako, Hyper- Mirror Toward Pleasant-to-use Video Mediated Communication System, In Proceedings of the 1998 ACM conference on Computer supported cooperative work, pp (1998)

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