A New Visual Servoing Method for Grasping and Assembling Objects using Stereo Image Based Feedback

محورهای موضوعی : robotics

mahmoud jeddi ¹ , ahmad reza khoogar ²

1 - Faculty of Material and Manufacturing Technologies Malek Ashtar University of Technology, Tehran, Iran
2 - Faculty of Material and Manufacturing Technologies Malek Ashtar University of Technology, Tehran, Iran

تاریخ دریافت : 1399/12/07 تاریخ پذیرش : 1400/03/27 تاریخ انتشار : 1401/12/10

کلید واژه: Stereo Image Based Visual Servoing, Image interaction matrix, Recursive Least Square, Feature matching, 6 DOF PILZ robot,

چکیده مقاله :

In this paper, an eye-in-hand stereo image-based visual serving controller for industrial 6 degrees of freedom manipulator robots is presented. The visual control algorithms mostly use the relationship between camera speed and changes in image features, to determine the end-effector movement path. One of the main problems of the classical IBVS method is the inability to estimate the distance of the object related to the camera, which requires peripheral equipment such as a laser rangefinder to estimate the depth. In this study, two cameras were mounted on the end-effector of a 6 DOF manipulator robot. The distance of the object to the camera is estimated by the equations associated with the epipolar plane, and the interaction matrix is updated at any time. For increasing response speed, the image interaction matrix was divided into two separate parts related to translational and rotational motion, and it was found that only the translational motion part is affected by distance. The control method separates the camera motion into three-stage based on pure rotation, pure translation, and hybrid motion, which has a better time response compared to the classical IBVS control methods. Additionally, a method for position prediction and trajectory estimation of the moving target in order to use in a real-time grasping task is proposed and developed using Recursive Least Square as the trajectory estimators in the image plane. The simulation results show that the proposed method increases the system response speed and improves the tracking performance.

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