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Learning about new objects that a robot sees for the first time is a difficult problem because it is not clear how to define the concept of object in general terms. In this paper we consider as objects those physical entities that are comprised of features which move consistently when the robot acts upon them. Among the possible actions that a robot could apply to a hypothetical object, pushing seems to be the most suitable one due to its relative simplicity and general applicability. We propose a methodology to generate and apply pushing actions to hypothetical objects. A probing push causes visual features to move, which enables the robot to either confirm or reject the initial hypothesis about existence of the object. Furthermore, the robot can discriminate the object from the background and accumulate visual features that are useful for training of state of the art statistical classifiers such as bag of features.

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