A hybrid opto-inertial Tracking System Prototype
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1 A hybrid opto-inertial Tracking System Prototype Faisal Kalim Supervisor: Benjamin Busam Partners: IFL & FRAMOS Final Presentation Computer Aided Medical Procedures (CAMP) Technische Universität München, Germany July 13, 2016
2 Project Outline Motivation Different Tracking Solutions Each have pros and cons Hybrid solution for overcoming limitations Problem Statement To develop a software prototype that fuses the data streams of both an inertial measurement unit (IMU) and an optical tracking system (OTS) OTS IMU Image Courtesies: B. Busam Optical Tracking for Medical Applications( July 8, 2016) Slideshare ( July 8, 2016) July 18, 2016 Slide 2
3 Project Outline Requirements and Specifications Tracking Tracking of device based on IMU data Data Fusion Evaluation Compare results of IMU based tracking to OTS GUI Display individual + hybrid pose values July 18, 2016 Slide 3
4 Project Outline Project Plan Made with TeamGantt July 18, 2016 Slide 4
5 Software Design Input Listener Camera Client Main serversocket: igtl::serversocket::pointer port: int UML Class Diagram + main(argc, char* argv[]) + initialiaze() + ReceiveTransform(igtl::Socket * socket, igtl::messageheader * header) + ReceivePosition(igtl::Socket * socket, igtl::messageheader * header) IMU + position[3]: float + velocity[3]: float + quaternion[4]: float + relativerotmat[9]: float + spatial_simple() GUI QuatRotation + CalculateRelativeRotation(const float q[4], const float p[4], double R[9]) + void quatern2rotmat(const float q[4], double R[9]) - q0: float - q1: float - q2: float - q3: float MahonyAHRS + MahonyAHRSupdateIMU(float gx, float gy, float gz, float ax, float ay, float az, float quaternion[4]) - p_est[81]: double - x_est[9]: double KalmanFilter + kalmanfiltercustom(const double z_data[], double y[3]) + kalmanfiltercustom_init(void) July 18, 2016 Slide 5
6 Software Design UML Activity Diagram Initialize IMU IMU not attached Wait for attachment IMU attached Set Callbacks Initialize Servers Send Hybrid Position Get Data from OTS Client Connected Update Position, Velocity and Transformation Client Connected Update position, velocity, and orientation IMU Client disconnected Client disconnected Slide 6 July 18, 2016
7 Software Design Strategies Server-Client: top-down 6 DOF position estimation: bottom-up Server-Client Communication OpenIGTLink Protocol, using TransfromMessage Separate Threads OpticalServer, GUIServer, HybridServer Environment Windows, Visual Studio, C++, phideget, OpenIGTLink, Matlab July 18, 2016 Slide 7
8 Project Results July 18, 2016 Slide 8
9 Project Results July 18, 2016 Slide 9
10 Project Results July 18, 2016 Slide 10
11 Project Outlook All tasks completed IMU Integration IMU calibration IMU Data filtering Position and Orientation estimation Server Implementation Co Calibration of IMU and optical tracker Data Fusion Analysis Visualization Future Work Calibration of IMU from more readings Accelerometer bias correction from optical data Adaptive filtering of accelerometer data More testing and evaluations Navigation grade IMU July 18, 2016 Slide 11
12 Project Retrospective Main Challenges Underestimated tasks Issues with third party libraries Tasks All mendatory tasks completed 6DOF pose estimation, IMUs, OpenIGTLink, Kalman filtering, Software Project Management, Presentation Skills Lessons Learned Integration of modules in different platforms July 18, 2016 Slide 12
13 Questions Comments Ideas July 18, 2016 Slide 13
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