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The problem of recognizing what objects are where in the workspace of a robot can be cast as one of searching for a consistent matching between sensory data elements and equivalent model elements. In principle, this search space is enormous, and to control the potential combinatorial explosion, constraints between the data and model elements are needed. A set of constraints for sparse sensory data that are applicable to a wide variety of sensors are derived, and their characteristics are examined. Known bounds on the complexity of constraint satisfaction problems are used, together with explicit estimates of the effectiveness of the constraints derived for the case of sparse, noisy, three-dimensional sensory data, to obtain general theoretical bounds on the number of interpretations expected to be consistent with the data. It is shown that these bounds are consistent with empirical results reported previously. The results are used to demonstrate the graceful degradation of the recognition technique with the presence of noise in the data, and to predict the number of data points needed, in general, to uniquely determine the object being sensed.

The combinatorics of local constraints in model-based recognition and localization from sparse data