Memory Efficient Large-Scale Image-Based Localization

Local features have been widely used in the area of image-based localization. However, large-scale 2D-to-3D matching problems still involve massive memory consumption, which is mainly caused by the high dimensionality of the features (e.g. 128 dimensions of SIFT feature). This paper introduces a new method that decreases local features’ high dimensionality for reducing memory capacity and accelerating the descriptor matching process. With this new method, all descriptors are projected into a lower dimensional space through the new learned matrices that are able to reduce the curse of dimensionality in the large scale image-based localization. The low dimensional descriptors are then mapped into a Hamming space for further reducing the memory requirement. This study also proposes an image-based localization pipeline based on the new learned Hamming descriptors. The new learned descriptor and the localization pipeline are applied to two challenging datasets. The experimental results show...