mgSeek is a collection of free open source projects for searching a collection of images using visual similarity. The image you are looking for can be expressed either as a rough painted sketch or as another image you supply.
The Query Representation and Understanding (QRU) data set contains a set of similar queries that can be used in web research such as query transformation and relevance ranking. QRU contains similar queries that are related to existing benchmark data sets, such as TREC query sets. The QRU data set was created by extracting 100 TREC queries, training a query-generation model and a commercial search engine, generating similar queries from TREC queries with the model, and removal of mistakenly generated queries.
Used by millions for research, teaching, and learning. With more than a thousand academic journals and over 1 million images, letters, and other primary sources, JSTOR is one of the world's most trusted sources for academic content.
M. Dörk, S. Carpendale, and C. Williamson. Proceedings of the International Working Conference on Advanced Visual Interfaces, page 233--240. New York, NY, USA, ACM, (2012)