Research of Image Retrieval Based on Vocabulary Tree in Virtual University

The demand of virtual database in implementation process of the virtual university were discussed, and further focused on analyzing a large scale image database for the virtual university in the necessity of demand for image retrieval. On this basis, a vocabulary tree image retrieval algorithm is applied to the virtual universities. Vocabulary tree is an efficient search data structure based on visual-keywords. Using vocabulary tree structure can improve the retrieval efficiency, and can meet the large-scale image database demand from the adaptability and scalability requirements, thus realizes the highly effective achieve virtual university.