Online learning of relevance feedback from expert readers for mammogram retrieval
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Supporting image retrieval framework with rule base system
Knowledge-Based Systems
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Relevance feedback (RF) is an iterative process which refines the retrievals by utilizing the user's feedback on previously retrieved results. Traditional RF techniques use solely the short-term learning experience and do not exploit the knowledge created during cross-sessions with multiple users. In this paper, we propose a novel RF framework which facilitates the combination of short-term and long-term learning processes by integrating the traditional methods with a new technique called the virtual feature. The feedback history with all the users is digested by the system and is represented in a very efficient form as a virtual feature of the images. As such, the dissimilarity measure can be adapted dynamically depending on the estimate of the semantic relevance derived from the virtual features. Also with a dynamic database, the user's subject concepts may transit from one to another. By monitoring the changes in retrieval performance, the proposed system can automatically adapt the concepts according to the new subject concepts. The experiments are conducted on a real image database. The results manifest that the proposed framework outperforms the one that adopts a traditional within-session RF technique.