參考文獻：Chum, Ondřej, Mikulík, Andrej, Perdoch M , et al. Total recall II: Query expansion revisited[C]// Computer Vision & Pattern Recognition. IEEE, 2011.原文連結

Query Expansion (QE).  We select the top K images after retrieval and aggregate their features and query feature by average . We use the aggregated feature as a new query and perform the retrieval again to obtain the final ranking list.

拓展查詢(QE, Query Expansion): 指對返回的前[email protected]個結果,包括查詢樣本本身,對它們的特徵求和取平均,以此為檢索特徵，再做一次查詢。目的是為了提高召回率。