High Fidelity Telepresence Systems: Design, Control, and Evaluation

                       Martin Buss, Martin Kuschel, K...
in the environment are sensed, communicated, and fed                                     back has been used successfully t...
compensation of disturbances due to friction and to be                                                  stereo camera head...
C. Multi-user mobile telepresence/teleaction                                  the 5th European Control Conference ECC’99 i...
[20] M. Buss and H. Hashimoto, “Motion Scheme for Dextrous                [36] M. Ueberle, N. Mock, and M. Buss, “Towards ...
[51] N. Nitzsche, Weitr¨umige Telepr¨senz: Unbeschr¨nkte Fort-
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High Fidelity Telepresence Systems: Design, Control, and ...

  1. 1. High Fidelity Telepresence Systems: Design, Control, and Evaluation Martin Buss, Martin Kuschel, Kwang-Kyu Lee, Angelika Peer, Bartlomiej Stanczyk, Marc Ueberle, Ulrich Unterhinninghofen Institute of Automatic Control Engineering (LSR) — Technische Universit¨t M¨nchen a u D-80290 Munich, Germany www.lsr.ei.tum.de www.sfb453.de Abstract. An overview of subjectively selected recent topics and research trends in the area of modern tele- presence and teleaction is given. Multi-modal telepresence systems are to enable human operators to become present and active in remote or inaccessible environments through a communication network and a suitable te- lerobotic system. The major challenges of such a multimodal telepresence system like stabilizing measures, and transparency, e.g. in the case of time-delay (latency) in the communication network, are discussed. A practical implementation of an integrated mobile and bimanual multi-user telepresence and teleaction system as well as some exemplary experiments are presented. Furthermore, it is discussed how the performance of telepresence systems can be improved by using psychophysical knowledge of human perception. Keywords. Telepresence, Multimodality, Psychophysics I. Introduction II. Multi-Modal Telepresence Systems Multi-modal telepresence and teleaction systems inclu- The structure of a multi-modal telepresence system is de classical teleoperation and telemanipulation systems. shown in Fig. 1. On the operator-site the human operator An important issue is the combination of telepresence gives multi-modal command inputs to the human system and teleaction, allowing the human operator to perform interface (HSI) using motion, voice, or symbolic input actively in remote environments. Here, remote environ- devices. The commands are transmitted to the executing ments include possibly distant and/or scaled physical en- teleoperator on the remote-site across (communication or vironments, virtual environments—VEs and augmented scale) barriers. The teleoperator is an executing robotic realities. system such as a mobile service robot and is control- One of the central issues in modern telepresence sy- led according to the commands received from the human stems is multi-modality in the human-system interface— operator. Sensors mounted on the teleoperator measure HSI accompanied by appropriate sensing techniques at the interaction between the teleoperator and the environ- the teleoperator site comprising theoretically all the hu- ment. Typically visual, acoustic, force, and tactile sensors man senses. In current technical applications most im- are used. Measured data is transmitted back to the hu- portant and only partly realized are the visual, auditory, man operator and displayed using modality dependent and haptic — i.e. kinesthetic, tactile and temperature — hardware in the multi-modal HSI comprising multimedia senses. and haptics. Application areas of telepresence and teleacti- Barriers on systems are countless, to name only a few: Operator-Site Remote-Site Acoustic Visual Environment tele-programming, tele-installation, tele-diagnosis, Display Display Teleoperator tele-service, tele-maintenance, tele-assembly, tele- 111111 000000 111111 000000 manufacturing, miniature or micro mechatronics, inner OK ? 111111 000000 111111 000000 and outer space operations, tele-teaching, tele-medicine, 111111 000000 111111 000000 Acoustic tele-surgery, tele-shopping, etc. Visual Haptic (force and tactile) feedback systems are one of Tactile Haptic Local Control Haptic Kinesthetic-Tactile the key elements in modern telepresence and virtual en- Display Display Measures Sensors/Actuators vironment systems. Telepresence systems are most often Fig.1: Multi-modal telepresence system operated with Internet communication, which means that the haptic control loop is closed over an unreliable com- One of the key issues in telepresence system design and munication channel posing additional challenges for con- operation is the degree of coupling between the human trol architectures. operator and the teleoperator. If the operator gives sym- Related overview articles addressing telepresence, hap- bolic commands to the teleoperator by pushing buttons tics, and Internet control are [15, 16, 29, 36, 72]; see also a and watching the resulting action in the remote envi- special section in Presence [10, 41, 58, 65–67] and a forth- ronment the coupling is weak. The coupling is strong for coming book about telepresence [3]. Sections II, III, and the haptic modality in a bilateral teleoperation scenario. IV discuss the general structure of multi-modal telepre- Commonly, the motion (force) of the human operator is sence systems, the design of an integrated mobile and measured, communicated, and used as the set-point for bimanual multi-user telepresence/teleaction system, and the teleoperator motion (force) controller. On the remo- psychophysical aspects, respectively. te site the resulting forces (motion) of the teleoperator
  2. 2. in the environment are sensed, communicated, and fed back has been used successfully to achieve stability (in back to the human operator through the force feedback fact passivity) of the communication link by interpreting channel of the multi-modal HSI. it as a lossless two-port [1, 5, 44, 50]. A visual predictive The literature on telepresence systems distinguishes display has been proposed using first a wire-frame and la- between remote, shared, cooperative, assisting, semi- ter a solid model image generated by computer graphics autonomous, symbolic and trading control, see e.g. [2, 11, hardware, which is then blended or overlayed with the 12, 25, 74] and [15] for a detailed discussion. camera image from the remote site [8, 35, 43]. Work by our colleagues in Munich aims at photorealistic predicti- multi-modal command augmented command ve displays [9, 10, 24, 62]. III. Integrated Mobile and Bimanual Multi-User Human Virtual (VE) Human Teleoperator & Operator Remote Engine Operator Model Environment Telepresence and Teleaction virtual feedback Existing telepresence systems show deficits with re- augmented feedback multi-modal spect to workspace, manipulability, and performance. reality feedback sensor information These deficits can partly be ascribed to a limited Barrier workspace of haptic display or telemanipulator. More- Fig.2: Multi-modal control loops in telepresence systems. over, most telepresence systems are limited to a few de- The multi-modal control loop of telepresence systems grees of freedom necessary for a specific task, which ma- is shown in Fig. 2. From the human operator the kes intuitive manipulation very difficult. multi-modal command consisting of voice, haptic (for- The demand on intuitive manageability of a telemani- ce/motion), and symbolic input is transmitted across pulation system results inevitably in a bimanual, mobi- the (communication) barrier to the teleoperator. Simul- le and kinematically redundant system. Enhancing such taneously, the command is also input to a model of the a system by further adding a multi-user mode enables teleoperator and remote environment implemented in a to perform collaborative telemanipulation tasks. Our in- virtual environment for local feedback. Data measured stitute aims at developing and implementing such a by teleoperator sensors results in multi-modal feedback to high-definition telepresence system, see Fig. 3. In or- the human operator across the barrier. Multi-modal feed- der to realize such a system the following research are- back consists of 2D or 3D visual, mono/stereo acoustic, as can be distinguished: A) stationary bimanual telepre- haptic (force, motion, tactile, temperature), and symbolic sence/teleaction in full 6 DOF, B) integrated mobile, information. The remote local control loop using a human bimanual telepresence/teleaction, C) multi-user mobile operator model increasing the autonomy of the teleope- telepresence/teleaction. In the following these research rator by implementing human task skill is also shown. topics and the current state of our research are briefly Multi-modal human system interaction with purely discussed. virtual environments has various important applications. Operator training is possible without risk for humans in- volved. A classical training application are flight simula- tors for pilot training, where the supported modalities ha- ve been visual feedback and acceleration emulation main- ly. Medical applications like e.g. practice runs of compli- cated surgical procedures are being developed for surgeon Fig.3: Mobile and bimanual haptic tele-collaboration training [73]. A system for multi-modal interaction with a virtual (possibly injured) human knee joint is [68]. Vir- A. Stationary bimanual telepresence and teleaction in tual environments are also being used to extract operator full 6 DOF expertise, to transfer, and implement this knowledge for In order to enable intuitive telemanipulation the hy- semi-autonomous local teleoperator control, see Fig. 2 per redundant haptic display ViSHaRD10 (Virtual and [11, 13, 20, 26, 48, 85]. Scenario Haptic Rendering Device with 10 actuated Feedback to the operator through the human system DOF) is used as a human system interface, see Fig. 4. interface is often augmented, i.e. remote data is fused Its main characteristics are a very large workspace free with supplemental data from a remote environment mo- of singularities, a high payload capability to accomodate del. Augmentation on the remote site uses human control various application specific end-effectors as e.g. surgical expertise from a human operator model to support local tools like drills [27] or scissors, foreseen redundancy to control of the teleoperator. Augmentation is possible for avoid kinematic singularities and user interferences and all mentioned human modalities, but most established the possibility for dual-arm haptic interaction with full are kinesthetic and (predictive) visual augmentation. In 6 DOF (again redundancy facilitates collision avoidance a bilateral kinesthetic teleoperation scenario local feed- between the two arms). In order to provide an effective
  3. 3. compensation of disturbances due to friction and to be stereo camera head able to render inertia and mass, admittance control has been implemented for this device. An appropriate inver- HMD se kinematic algorithm enables a reasonable redundancy Position resolution. Further details about the design concept, the kinematic model, and the control of ViSHaRD10 can be found in [79–83]. Force Vision ViSHaRD 10 7DoF Telerobot master slave Fig.6: Experimental setup: tele-screw-tightening B. Integrated mobile, bimanual telepresence/teleaction In order to enable telepresence in arbitrarily large re- mote environments the telemanipulator is mounted on a mobile base which can freely move around in the remote environment [14,28,64]. For maintaining a high degree of immersion in wide area telepresence it is crucial to con- Fig.4: Bimanual haptic dis- Fig. 5: Dual arm telemani- vey a natural feeling of locomotion. This is achieved by play ViSHaRD10 pulator also placing the haptic interface on a mobile base which allows to track operator motions and to reflect forces at the same time, see Fig. 3. The mobile haptic interface The superior manipulation-dexterity of humans is a (MHI) can be used in wide area telepresence as well as in result of the kinematic redundancy of human arms and extensive virtual environments [51, 54, 59]. Related Work the ability to adapt their compliance to the current task. can be found in [4, 7, 17, 19, 22, 37, 61, 70, 84]. As many technical design solutions being inspired by na- A problem which is common to both applications of ture, an anthropomorphic bi-manual redundant telema- an MHI is the limited workspace at the operator site. nipulator has been designed, see Fig. 5. The telemanipu- Techniques like scaling or indexing have been shown to lator consists of two identical, human-scaled arms. Each considerably reduce the feeling of presence in the target arm consists of two spherical joints with 3 DOF at shoul- environment (see [6,18,66,71]). Using the concept of mo- der and wrist, each, and one revolute joint at the elbow, tion compression [52, 52, 53, 55–58, 60, 69] the path in the which results in 7 DOF, see [75, 76, 78]. The redundan- remote environment is transformed in such a way that it cy of the slave is efficiently utilized to fulfill additional fits into the available operator space, see Fig. 7. As long kinematic or dynamic tasks, e.g. to avoid singularities as the curvature deviation between original and transfor- or joint limits and to increase the structural stiffness of med path is kept below a certain threshold the operator the arm in contact situations [14]. During telemanipula- cannot perceive compression artifacts. tion, the telemanipulator has to handle interactions with unstructured rigid environments. For such reasons, a con- trol algorithm that guarantees compliant behavior during contact is applied, see [14, 63, 64, 77]. In order to combine these both devices to a bimanual telemanipulation system a coupling-method for devices with different kinematic structures has been developed. In addition, the implemented control algorithms for hap- tic display and telemanipulator assure a stable interacti- on with the environment. In several experiments tracking of free space motion, haptic exploration of different ma- terials as well as fixing a screw by telepresence has been successfully demonstrated, see Fig. 6 and [14, 63, 64]. The extension of this system for bimanual manipulati- on requires further analysis of possible contact situations Fig.7: Trajectories of a test run in user environment (left) and the investigation of new stable control algorithms. and target environment (right) [57]
  4. 4. C. Multi-user mobile telepresence/teleaction the 5th European Control Conference ECC’99 in Karlsruhe, Finally the collaboration of multiple human opera- Germany (P. Frank, ed.), pp. 65–101, Springer, 1999. tors in a telepresence and teleaction scenario is currently [2] M. Buss and G. Schmidt, “Multi-Modal Telepresence,” in Proceedings of the 17th International Mechatronics Forum, being investigated. Thereby the human operators inter- Science and Technology Forum 2000, Plenary, (Kagawa Uni- act with mobile haptic interfaces and control mobile tele- versity, Kagawa, Japan), pp. 24–33, 2000. operators located at the remote site. The main research [3] S. E. Salcudean, Control Problems in Robotics and Automati- topics in this field are the development of control algo- on, pp. 51–66. No. 230 in Control for Teleoperation and Haptic Interfaces, Lecture Notes, Springer Verlag, Berlin, 1998. rithms for collaborative telemanipulation and task sha- [4] V. Hayward, O. Astley, M. Cruz-Hernandez, D. Grant, and ring as well as the automatic collision avoidance between G. Robles-De-La-Torre, “Haptic interfaces and devices,” Sen- the teleoperators. sor Review, vol. 24, no. 1, pp. 16–29, 2004. [5] J. M. Hollerbach, “Some current issues in haptics research,” in Proc. of the IEEE International Conference on Robotics & IV. Telepresence and Psychophysics Automation, (San Francisco, California), pp. 757–762, 2000. A. Dynamical model of human perception [6] P. Kammermeier, A. Kron, J. Hoogen, and G. Schmidt, “Dis- Another way to improve telepresence systems is to ta- play of holistic haptic sensations by combined tactile and ki- ke into account psychophysical aspects of human per- nesthetic feedback,” Presence: Teleoperators and Virtual En- vironments, vol. 13, no. 1, pp. 1–15, 2004. ception. Therefore, multimodal processes are described [7] B. Petzold, M. Zaeh, B. Faerber, B. Deml, H. Egermeier, quantitatively by a systems theoretical model providing J. Schilp, and S. Clarke, “A study on visual, auditory, and statical, dynamical and statistical information. On the haptic feedback for assembly tasks,” Presence: Teleoperators and Virtual Environments, vol. 13, no. 1, pp. 16–21, 2004. basis of a structural description [39] we investigate mul- timodal processes normally elicited within telepresence [8] T. Burkert, J. Leupold, and G. Passig, “A photorealistic pre- dictive display,” Presence: Teleoperators and Virtual Environ- (haptic, visual and auditive). Thereby, we concentrate ments, vol. 13, no. 1, pp. 22–43, 2004. on crossmodal interactions and sensory processes [42,45]. [9] N. Nitzsche, U. Hanebeck, and G. Schmidt, “Motion compres- We use psychophysical models to develop data reduc- sion for telepresent walking in large target environments,” Pre- sence: Teleoperators and Virtual Environments, vol. 13, no. 1, tion algorithms and new kinds of transparency measu- pp. 44–60, 2004. res to be used in haptic telepresence [30–34, 49]. High [10] M. Popp, E. Platzer, M. Eichner, and M. Schade, “Walking fidelity telepresence systems like a multimodal bima- with and without walking: Perception of distance in large-scale nual human system interface or several tactile displays urban areas in reality and in virtual reality,” Presence: Tele- operators and Virtual Environments, vol. 13, no. 1, pp. 61–76, (shear force, thermal) serve as experimental testbeds 2004. [21, 23, 38, 40, 46, 47]. [11] D. Reintsema, C. Preusche, T. Ortmaier, and G. Hirzinger, V. Conclusion “Toward high-fidelity telepresence in space and surgery ro- botics,” Presence: Teleoperators and Virtual Environments, An overview of the general structure of multi-modal vol. 13, no. 1, pp. 77–98, 2004. telepresence and teleaction systems has been given. Ty- [12] R. Aracil, C. Balaguer, M. Buss, M. Ferre, and C. Melchiorri, pical control modes in multi-modal telepresence systems eds., Advances in Telerobotics: Human Interfaces, Control, and Applications. 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