Fenwick & West LLP
Entrance detection from street-level imagery
Architecture that detects entrances on building facades. In a first stage, scene geometry is exploited and the multi-dimensional problem is reduced down to a one-dimensional (1D) problem. Entrance hypotheses are generated by considering pairs of locations along lines exhibiting strong gradients in the transverse direction. In a second stage, a rich set of discriminative image features for entrances is explored according to constructed designs, specifically focusing on properties such as symmetry and color consistency, for example. Classifiers (e.g., random forest) are utilized to perform automatic feature selection and entrance classification. In another stage, a joint model is formulated in three dimensions (3D) for entrances on a given facade, which enables the exploitation of physical constraints between different entrances on the same facade in a systematic manner to prune false positives, and thereby select an optimum set of entrances on a given facade.
Uber Technologies, Inc.
G G G G G G G G
G06V G06K G06V G06V G06V G06T G06K G06V
inventional inventional inventional inventional inventional inventional inventional additional
Varsha Jingchen Yanxi Thommen Vasudev Radek
Hedau Liu Liu Korah Parameswaran Grzeszczuk