Semantic segmentation with heterogeneous sensor coverages

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Abstract
We propose a new approach to semantic parsing, which can seamlessly integrate evidence from multiple sensors with overlapping but possibly different fields of view (FOV), account for missing data and predict semantic labels over the spatial union of sensors coverages. The existing approaches typically carry out semantic segmentation using only one modality, incorrectly interpolate measurements of other modalities or at best assign semantic labels only to the spatial intersection of coverages of different sensors. In this work we remedy these problems by proposing an effective and efficient strategy for inducing the graph structure of Conditional Random Field used for inference and a novel method for computing the sensor domain dependent potentials. We focus on RGB cameras and 3D data from lasers or depth sensors. The proposed approach achieves superior performance, compared to state of the art and obtains labels for the union of spatial coverages of both sensors, while effectively using appearance or 3D cues when they are available. The efficiency of the approach is amenable to realtime implementation. We quantitatively validate our proposal in two publicly available datasets from indoors and outdoors real environments. The obtained semantic understanding of the acquired sensory information can enable higher level tasks for autonomous mobile robots and facilitate semantic mapping of the environments.

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