Localization Vs image Retrieval

Retrieval: aim at finding as many relevant database images as possible for a given query image.

Localization: retrieve just one relevant image if the correspondences found by matching query and database image suffice to estimate the camera pose of the query image.

  • Recall-improving techniques such as query expansion do not improve the localization
  • fast, approximate spatial verification

    approaches could not be used

  • for mobile App, efficiency is more important than accuracy – drop number of candidate images which could be localized

correspondences for camera pose estimation

    • use image retrieval to find the similar views in dataset
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