Motion Stylization using a Timing Control Method
Motion Stylization using a Timing Control Method Toshihiro KONMA‡ Shobi University
Kei TATENO,Wei XIN, Shoichi OBAYASHI, Kunio KONDO* Saitama University 1 Introduction The purpose of this research is to propose a method of motion stylization using a timing control method. Our final goal is to make cartoon–like 2D animation from 3D animation data. Hatsuyama[1] and Koie[2] introduced methods to exaggerate motion, but their methods don’t deal with all the exaggerated expressions. Therefore, we propose a method that could handle all these expressions together. Furthermore, our method can extract key-frames from motion capture data, and 2D robot-like motion and character motion could be made based on key-frames extracted from motion capture data.
2 Overview of Our Proposed Method 2D animation made by referencing raw motion capture data lacks of cartoon-like characteristics. To overcome this, great effort is needed to edit the motion capture data. In this research, firstly, we extract the keyframes which characterize the original motion. This method of keyframe extraction is based on Xin’s research[3]. Then we can make robot-like motion with liner-interpolation between two keyframes. Also, characteristic cartoon–like 2D animation can be made using a timing control method. This is called “Mental Motion”. Fig.1 shows how a curve is edited in this method. Angle
Input: Motion Capture Data
Selection of Exaggeration Parts Input of Exaggeration Frames Input of Anticipation Parameters
Timing Control : Editing of Timing Curve Control of “Deceleration & Acceleration”
Harmonize “Deceleration with Anticipation”
Output: Motion with Exaggeration
Fig.(b) is exaggerated motion by applying timing control method and is rendered with the cartoon blur method[4]. The timing curve of Fig. (b) is based on our investigation of 2D cartoon animation techniques. (a)
Output Frame
Input Frame
(b)
Output Frame
MoCap data Keyframe Extraction
Time Keyframe
Motion data with Keyframe
Input Frame
Fig.3 Examples of Mental Motion Making of
Making of
Robot-like Motion
Character Motion
Fig.1 Overview of Motion Stylization
3 Making of Motion using Timing Control Method Fig.2 shows the outline of our system. In this system, for motion capture data, we first select the parts to be exaggerated from the character’s skeleton, and then we input the range of frames of exaggeration. After that, we add anticipation to the motion. Finally, we control timing by editing timing curve. In timing control, deceleration and acceleration are edited and harmonized interactively based on the animator’s technique. 4 Examples of Motion Making Fig.3 shows examples of two kind of motion with each timing curves. Fig.(a) is an original motion capture data. *
e-mail: {tateno,xin, obayasi_s, kondo}@ke.ics.saitama-u.ac.jp Fig.2 Making of Motion using Timing Control Method † e-mail:[email protected]
5 Conclusions In this research, we proposed a method that stylize motion and handle all the exaggerated expressions together using timing control. With this method, exaggerated expressions can be generated by adjusting deceleration and acceleration interactively based on the animator’s technique. Using our timing control method, robot-like motion and cartoon-like characteristic motion could be implemented. References [1] Hatsuyama K.，Kondo K.”Motion emphasis method for 3D character animation”， The 64th National Convention of IPSJ, vol.4 pp.847-848, (2002) [2] Koie Y．， Kondo K．and Konma T． “Motion Emphasis Filter for Making Mental Motion of 3D Characters”， Siggraph 2004 Sketches (2004) [3] Xin W., Kondo K., Tateno T ., Konma T. “Key Pose Extraction Method from Motion Capture Data”, ADADA 2005 proceedings，pp．92-93 ,(2005) [4] Obayashi S., Kondo K. and Konma T. “Non-Photorealistic Motion Blur for 3D Animation”, Siggraph 2005 Sketches(2005)
Kei TATENO,Wei XIN, Shoichi OBAYASHI, Kunio KONDO* Saitama University 1 Introduction The purpose of this research is to propose a method of motion stylization using a timing control method. Our final goal is to make cartoon–like 2D animation from 3D animation data. Hatsuyama[1] and Koie[2] introduced methods to exaggerate motion, but their methods don’t deal with all the exaggerated expressions. Therefore, we propose a method that could handle all these expressions together. Furthermore, our method can extract key-frames from motion capture data, and 2D robot-like motion and character motion could be made based on key-frames extracted from motion capture data.
2 Overview of Our Proposed Method 2D animation made by referencing raw motion capture data lacks of cartoon-like characteristics. To overcome this, great effort is needed to edit the motion capture data. In this research, firstly, we extract the keyframes which characterize the original motion. This method of keyframe extraction is based on Xin’s research[3]. Then we can make robot-like motion with liner-interpolation between two keyframes. Also, characteristic cartoon–like 2D animation can be made using a timing control method. This is called “Mental Motion”. Fig.1 shows how a curve is edited in this method. Angle
Input: Motion Capture Data
Selection of Exaggeration Parts Input of Exaggeration Frames Input of Anticipation Parameters
Timing Control : Editing of Timing Curve Control of “Deceleration & Acceleration”
Harmonize “Deceleration with Anticipation”
Output: Motion with Exaggeration
Fig.(b) is exaggerated motion by applying timing control method and is rendered with the cartoon blur method[4]. The timing curve of Fig. (b) is based on our investigation of 2D cartoon animation techniques. (a)
Output Frame
Input Frame
(b)
Output Frame
MoCap data Keyframe Extraction
Time Keyframe
Motion data with Keyframe
Input Frame
Fig.3 Examples of Mental Motion Making of
Making of
Robot-like Motion
Character Motion
Fig.1 Overview of Motion Stylization
3 Making of Motion using Timing Control Method Fig.2 shows the outline of our system. In this system, for motion capture data, we first select the parts to be exaggerated from the character’s skeleton, and then we input the range of frames of exaggeration. After that, we add anticipation to the motion. Finally, we control timing by editing timing curve. In timing control, deceleration and acceleration are edited and harmonized interactively based on the animator’s technique. 4 Examples of Motion Making Fig.3 shows examples of two kind of motion with each timing curves. Fig.(a) is an original motion capture data. *
e-mail: {tateno,xin, obayasi_s, kondo}@ke.ics.saitama-u.ac.jp Fig.2 Making of Motion using Timing Control Method † e-mail:[email protected]
5 Conclusions In this research, we proposed a method that stylize motion and handle all the exaggerated expressions together using timing control. With this method, exaggerated expressions can be generated by adjusting deceleration and acceleration interactively based on the animator’s technique. Using our timing control method, robot-like motion and cartoon-like characteristic motion could be implemented. References [1] Hatsuyama K.，Kondo K.”Motion emphasis method for 3D character animation”， The 64th National Convention of IPSJ, vol.4 pp.847-848, (2002) [2] Koie Y．， Kondo K．and Konma T． “Motion Emphasis Filter for Making Mental Motion of 3D Characters”， Siggraph 2004 Sketches (2004) [3] Xin W., Kondo K., Tateno T ., Konma T. “Key Pose Extraction Method from Motion Capture Data”, ADADA 2005 proceedings，pp．92-93 ,(2005) [4] Obayashi S., Kondo K. and Konma T. “Non-Photorealistic Motion Blur for 3D Animation”, Siggraph 2005 Sketches(2005)
