earticle

영어

With the rapid increasing of video data, video queries are becoming increasingly important. To better describe users’ video query requirements, developing a functional video query language has become a promising and interesting task. In this paper, we present a novel query language called SVQL for video databases, which is developed based on an extension of the traditional database query language SQL. In SVQL, we remain the clear and concise grammatical framework of SQL, thereby making SVQL easy to learn and use for traditional users, i.e., making SVQL with a user-friendly interface. Moreover, we extend the WHERE clause of SQL to introduce new conditional expressions, such as variable declaration, structure specification, feature specification and spatial-temporal specification, thereby, making SVQL with powerful expressiveness. In this paper, we first present the formal definitions of SVQL and illustrate its basic query capabilities using examples. Then, we discuss the SVQL query processing techniques. Finally, we evaluate SVQL through the comparison with other existing video query languages, and the evaluation results demonstrate the practicality and effectiveness of our proposed query language for video databases