Improving VLAD: Hierarchical coding and a refined local coordinate system
Christian Eggert, Stefan Romberg, Rainer W. Lienhart · 2014
The enormous growth of image databases calls for new techniques for fast and effective image search that scales with millions of images. Most importantly, the setting requires a compact but also descriptive image signature. Recently, the vector of aggregated local descriptors (VLAD) [1] has received much attention in large-scale image retrieval. In this paper we present two modifications for VLAD which improve the retrieval performance of the signature.