C-18 Markerless motion capture using sensor fusion ENOMOTO Kota Measuring the human motion is an active field of reseach. It has important direct appl

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1 C-8 Markerless motion capture using sensor fusion ENOMOTO Kota Measuring the human motion is an active field of reseach. It has important direct applications in the the filed of human robot interaction and in medicine. However, systems are often complex, costly and limited by the infrastructure itself. Motion capture systems based on video information are simple to use however they cannot guaranty an accurate measurement when there is occlusion or partial observation. Here we propose to use stereo camera information and Inertial Measuring Units (IMU) to obtain a precise motion measurements at all time. The combination of the two systems thus overcomes the weaks point of each. Key words: Sensor Fusion, Optical Flow, Stereo Camera, IMU. () () CG (3)(4) (5) IMU: Inertial Measurement Unit IMU (6)(7) IMU RGB RGB. POINT GREY Bumblebee Bumblebee Fig. IMU IMU 3 (8) C-8

2 IMU PocketIMU PocketIMU Fig. Fig. Bumblebee Fig.4 Explanation of optical flow Fig. PocketIMU 3. IMU Fig.3 Fig.3 Fusion fiow 3 OpenCV OpenCV ROI :Region of Interest Fig.4 Lucas-Kanade Lucas-Kanade (9) u = v = w I x w I y (J(p) I(p)) w( x () ) (J(p) I(p)) w( I () y ) (x, y) t I (x,y) w (u,v) I (p)=i (x,y,t), J (p)=i (x,y,t+ t) 3 Bumblebee Triclops Stereo Vision SDK () d max min m m d=d min i= m j= m I right (x + i)(y + j) I left (x + i + d)(y + j) (3) d max d min :I right I left m Fig.5 α β L θ i width j height α Fig.5 β r X Z Y 4:3 r Y 3 3 Bumblebee API Open CV 3 3 OpenCV 3 Fig.6

3 Fig.5 Triangulation Fig.6 Image fiow 3 8 Fig.7 Fig.7 Image matching fiow 3 4 IMU IMU IMU IMU (?) IMU IMU IMU IMU 4. IMU Eagle Hawk Cortex 3 IMU 3 IMU IMU IMU.ms 4.89dB 7.8fps IMU Hz fps Fig.8 IMU Fig Fig.?? 4 Fig. Fig.

4 Trimmed Mean Filter Median Filter Trimmed Mean Filter Median Filter 3 Trimmed Mean Filter Median Filter Fig.8 experiment environment Fig. Testing different filter for stereo camera reconstruction of the hand movement. X-axis (top) and Y-axis (middle) and Z-axis (bottom) Fig.9 IMU with markers と最大値を除し 除されたデータ群の平均をとる処理で ある 一方で メディアンフィルタとは 任意に設定した狭 い区間の中央値を出し 算出された中央値をフィルタリ ング結果として提示する 中央値とは 任意の区間の数 値を昇順あるいは降順に並べ 区間内の数値の個数が奇 数ならば並びの中央の値であり 偶数ならば中央に近い 二つの値の平均の値である 結果より 双方のフィルタリングでインパルス性ノイ ズの軽減が認められた また Table より トリムド 平均フィルタよりもメディアンフィルタの方が相関係数 が に近い しかし トリムド平均フィルタ及ぶメディ アンフィルタともに 奥行き方向 Z 軸方向 へは若干 の不安が残る結果となっている Fig. The sequnce of moving Table. Result of stereo camera Correlation Coefficient X Y Z Trimmed Mean Median IMU 実験結果 IMUの実験結果を Fig. と Table に示す 重力 方向 Y 軸方向 に関しては一致が認められる しかし 他 方向に関しては 動作が大きいとき 動きの傾向は 判別できるが 動作が小さいまたは静止に近い状態や 動軸方向に動いているとき モーションキャプチャの値 と離れたものとなっている このような誤差の原因はモーションキャプチャと IMU の処理の違いが考えられる IMU は加速度を計測し そ の計測結果を積分し 速度を算出している 一方 モー ションキャプチャはマーカ位置を計測し 計測結果を微 分し 速度を算出している 計測結果を積分することで データノイズの蓄積があり その蓄積が求められた速度 の値を本来の値よりも大きなものにする可能性がある 静止に近い状態であっても IMU がごく微小な加速度 が検出するので 積分後にあたかもより大きな速度があ るように計測結果を算出してしまう また 光学式モー ションキャプチャの解析ソフト Cortex が独自にフィルタ リングを施し ごく微小な動きをデータ内で切り捨てて いる可能性がある

5 IMU IMU Fig.3 A sequence of captured movement on occlusion experiment IMU Fig. Result of IMU, X-axis (top) and Y-axis (middle) and Z-axis (bottom) Table. Result of IMU X Y Z Full Time IMU Y -9 9 Fig.3 IMU 5.ms 4.89dB 7.8fps IMU Hz fps Fig.4.5 Fig.5 Fig.6 Table 3 Image Speed [pixel/s] 4 3 Image IMU sensor Fig.4 Speed data of image and IMU Criteria Fig.5 Correlation coefficient of image and IMU Table 3. Result of sensor fusion.5.5 X Y Z Stereo Camera IMU IMU Speed [m/s]

6 Stereo Camera IMU Sensor Stereo Camera IMU Sensor Stereo Camera IMU Sensor Fig.6 Result of IMU, X-axis (top) and Y-axis (middle) and Z-axis (bottom) IMU Fig.6 Table 3 6. IMU IMU IMU IMU (),,,,,, 3. (), vol. 33(), pp , 9. (3) L.Kovar, M. Gleicher, F. Pighin, Motion Graphs, SIGGRAPH, Vol., Issue 3, pp ,. (4) J. Lee, J. Chai, P. S. A. Reitsma, J. K. Hodgins, N. S. Pollard, Interactive Control of Avatars Animated with Human Motion Data, SIG- GRAPH, Vol., Issue 3, pp. 49-5,. (5). PRMU, vol. 99(574), pp. -8, (6) Z. Li, D. Kulic, A Stereo Camera Based Full Body Human System Using a Partitioned Particle Filter, Intelligent Robots and Systems (IROS), IEEE/RSJ International Conference on, pp , (7) S. Kagami, K. Okada, M. Inaba, H. Inoue, Real - Time 3D Flow Generation System, IEEE International Conterence on Multisensor Fusion and Integration for Intelligent System, pp. 37-4, 999. (8) ( ),,,. (9) B. D. Lucas, T. Kanade, An Iterative Image Registration Technique with an Application to Stereo Vision, Proceedings of Imaging Understanding Workshop, pp. -3, 98. (),,,,, Vol. 7, No.7, pp , 976 () 3 p

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