Congruency-Based Reranking

We present a tool for re-ranking the results of a specific query by considering the (n+1)×(n+1)matrix of pairwise similarities among the elements of the set of n retrieved re-sults and the query itself. The re-ranking thus makes use of the similarities between the various results and does not em-ploy additional sources of information. The tool is based on graphical Bayesian models, which reinforce retrieved items strongly linked to other retrievals, and on repeated cluster-ing to measure the stability of the obtained associations. The utility of the tool is demonstrated within the context of visual search of documents from the Cairo Genizah and for retrieval of paintings by the same artist and in the same style. 1