1. Standard BOW
1.1. Feature Extraction
1.1.1. Local feature
1.1.2. Holistic feature
1.2. Building Codebook
1.2.1. HKM
1.2.2. AKM - Object Retrieval with Large Vocabularies and Fast Spatial Matching, Philbin 2008
1.3. Quantization
1.3.1. Soft-assignment, Philbin - CVPR 2008
1.3.2. Naturally Soft-Assignment (Visual Place Recognition), Torii - CVPR 2013
1.3.3. Triangulation embedding, Jegou - CVPR 2014
1.3.4. Scalable cascaded hashing (SCH) scheme -> codebook-free, Wengang Zhou - TMM2014
1.4. BOW Weighting/Normalization
1.4.1. BM25 With Exponential IDF, Murata - TMM2014
1.4.2. Lp Norm, Liang Zheng - TIP 2014
1.5. Aggregation
1.5.1. Democratic Aggregation, Jegou - CVPR 2014
1.5.2. Group local features and represent each group as a binary feature, Zhen Liu - TMM 2015
1.6. Similarity/Distance Metric
1.6.1. Asymmetric distance, Caizhi - ICCV 2013
1.6.2. Construction Error as a distance metric, Zhen Liu - TMM 2015
1.7. Spatial Ranking
1.7.1. Hamming Embedding + WGC, Jegou - ECCV 2008
1.7.2. Efficient Representation of Local Geometry, Perdoch 2009
2. Post Processing
2.1. Geometric consistency checking
2.1.1. Fast Spatial Matching, Philbin - CVPR 2008
2.1.2. Topological Spatial Verification, Wei Zhang - TMM 2015
2.1.3. Hough Voting Scheme + star model, Zhiyuan Zhong - TMM 2015
2.1.4. MLDP correspondence based, Crowley - BMVC 2014
2.1.5. Practical spatial reranking for video instance search, Xiao Zhou - ICIP 2014
2.2. Query Expansion
2.2.1. KNN và kết hợp với AQE, Zhiyuan Zhong - TMM 2015
2.2.2. Discriminative query expansion, Arandjelovic - CVPR 2012
2.2.3. Average Query Expansion, Chum - ICCV 2007
2.3. Learning based
2.3.1. Relevance feedback framework (PRF), Yuan Liu - TCSVT 2010
2.4. Graph based reranking
2.4.1. K-reciprocal nearest neighbors, Danfeng Qin - CVPR2011
2.4.2. Database-side for feature augmentation, Arandjelovic - CVPR 2012