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Factors affecting rocchio‐based pseudorelevance feedback in image retrieval
Author(s) -
Tsai ChihFong,
Hu YaHan,
Chen ZongYao
Publication year - 2015
Publication title -
journal of the association for information science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.903
H-Index - 145
eISSN - 2330-1643
pISSN - 2330-1635
DOI - 10.1002/asi.23154
Subject(s) - computer science , weighting , cosine similarity , relevance feedback , representation (politics) , feature (linguistics) , pattern recognition (psychology) , artificial intelligence , similarity (geometry) , wavelet , image retrieval , image (mathematics) , medicine , linguistics , philosophy , politics , political science , law , radiology
Pseudorelevance feedback ( PRF ) was proposed to solve the limitation of relevance feedback ( RF ), which is based on the user‐in‐the‐loop process. In PRF , the top‐ k retrieved images are regarded as PRF . Although the PRF set contains noise, PRF has proven effective for automatically improving the overall retrieval result. To implement PRF , the Rocchio algorithm has been considered as a reasonable and well‐established baseline. However, the performance of R occhio‐based PRF is subject to various representation choices (or factors). In this article, we examine these factors that affect the performance of Rocchio‐based PRF , including image‐feature representation, the number of top‐ranked images, the weighting parameters of R occhio, and similarity measure. We offer practical insights on how to optimize the performance of R occhio‐based PRF by choosing appropriate representation choices. Our extensive experiments on NUS‐WIDE‐LITE and C altech 101 + C orel 5000 data sets show that the optimal feature representation is color moment + wavelet texture in terms of retrieval efficiency and effectiveness. Other representation choices are that using top‐20 ranked images as pseudopositive and pseudonegative feedback sets with the equal weight (i.e., 0.5) by the correlation and cosine distance functions can produce the optimal retrieval result.