SalientDSO: Bringing Attention to Direct Sparse Odometry


Huai-Jen Liang
Nitin J. Sanket
Cornelia Fermüller
Yiannis Aloimonos

Perception and Robotics Group
at
University of Maryland, College Park


Abstract


Fig. 1: Sample point-cloud output of SalientDSO which does not have loop closure or global bundle adjustment. The insets show the corresponding image, saliency, scene parsing outputs and active features. Observe that features from non-informative regions are almost removed approaching object centric odometry.


Although cluttered indoor scenes have a lot of useful high-level semantic information which can be used for mapping and localization, most Visual Odometry (VO) algorithms rely on the usage of geometric features such as points, lines and planes. Lately, driven by this idea, the joint optimization of semantic labels and obtaining odometry has gained popularity in the robotics community. The joint optimization is good for accurate results but is generally very slow. At the same time, in the vision community, direct and sparse approaches for VO have stricken the right balance between speed and accuracy. We merge the successes of these two communities and present a way to incorporate semantic information in the form of visual saliency to Direct Sparse Odometry - a highly successful direct sparse VO algorithm. We also present a framework to filter the visual saliency based on scene parsing. Our framework, SalientDSO, relies on the widely successful deep learning based approaches for visual saliency and scene parsing which drives the feature selection for obtaining highly-accurate and robust VO even in the presence of as few as 40 point features per frame. We provide extensive quantitative evaluation of SalientDSO on the ICL-NUIM and TUM monoVO datasets and show that we outperform DSO and ORB-SLAM - two very popular state-of-the-art approaches in the literature. We also collect and publicly release a CVL-UMD dataset which contains two indoor cluttered sequences on which we show qualitative evaluations. To our knowledge this is the first paper to use visual saliency and scene parsing to drive the feature selection in direct VO.




Paper

Huai-Jen Liang, Nitin J. Sanket, Cornelia Fermüller, Yiannis Aloimonos.

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