Predicting Object Dynamics From Visual Images Through Active Sensing Experiences

Authors: Nishide, Shun¹; Ogata, Tetsuya¹; Tani, Jun²; Komatani, Kazunori¹; Okuno, Hiroshi G.¹

Source: Advanced Robotics, Volume 22, Number 5, 2008 , pp. 527-546(20)

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Abstract:

Prediction of dynamic features is an important task for determining the manipulation strategies of an object. This paper presents a technique for predicting dynamics of objects relative to the robot's motion from visual images. During the training phase, the authors use the recurrent neural network with parametric bias (RNNPB) to self-organize the dynamics of objects manipulated by the robot into the PB space. The acquired PB values, static images of objects and robot motor values are input into a hierarchical neural network to link the images to dynamic features (PB values). The neural network extracts prominent features that each induce object dynamics. For prediction of the motion sequence of an unknown object, the static image of the object and robot motor value are input into the neural network to calculate the PB values. By inputting the PB values into the closed loop RNNPB, the predicted movements of the object relative to the robot motion are calculated recursively. Experiments were conducted with the humanoid robot Robovie-IIs pushing objects at different heights. The results of the experiment predicting the dynamics of target objects proved that the technique is efficient for predicting the dynamics of the objects.

Keywords: ACTIVE SENSING; NEURAL NETWORKS; DYNAMICS; HUMANOID ROBOT; OBJECT MANIPULATION

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156855308X294879

Affiliations: 1: Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan 2: Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama 351-0198, Japan

Publication date: 2008-04-01