For multi-level semantic structure, the asymmetry of similarity between semantic concepts, as well as the different correlation of semantics between the children nodes and father node, this dissertation proposed a novel similarity calculation method of image semantic based on the probabilistic weighting. This method combines the image feature mapping the visual characteristics of the underlying semantic with the domain ontology description to build a tree-like hierarchical semantic model.

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... ing to what the posterior probability and conditional probability were gained by Bayesian network learning, and further for those semantic similarity who are based on semantic distance took the weighted processing so as to get the final similarity of image semantic. Moreover, taking the medical image semantics as the experiment object in weighted method can improve the retrieval performance compared with the non-weighted similarity calculation method. 122 Copyright ⓒ 2014 SERSC ontology to construct multi-level semantic structure of the tree model. Then consider the conditional probability between semantic concepts which are got from Bayesian network learning as the forward and reverse factor and weight the semantic similarity model, which overcomes asymmetry and reflects the similarity measure of children nodes and father node under the condition of different correlation.