A content-based image retrieval system using extended SQL in RDBMS

We implement an efficient image retrieval system via a content-based approach in the relational database system. In our system, as the preprocessing stages, we extract the color and texture features from the input image to get the retrieval keywords in the image database. First, our system classifies the images roughly by the color features using the ART2 neural network model. The classified information is stored in a relational database with the original image. To retrieve images similar to the query image, we extend the relational SQL statement coupled with the ART2 function in the WHERE condition clause. Next, to retrieve final results of images, we compare the query image with the candidate images which have the same category information by the texture features. The proposed system is implemented on Oracle DBMS. It shows satisfactory retrieval results in a test of the sample image database.