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A novel approach is proposed for enhancement the contrast of the background and the vein texture image based on the combination of high-frequency emphasis filtering and histogram equalization, it overcomes the influence of luminous intensity and thickness of the back of hand skin. High-frequency emphasis filtering is used to give prominence to vein texture, and then histogram equalization is adopted...
With the development of the information technology, database security draws more and more attention than before. It is desirable to store data in encrypted form to protect the sensitive data from various attacks. But the efficiency of DBMS will fall as the SQL clauses can not execute over the encrypted data directly. In this paper we propose a secure cipher index with great efficiency over the encrypted...
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