The task of fingerprint segmentation is to isolate the fingerprint area from the image background. In this paper, a new algorithm of fingerprint segmentation based on block variance and gradient factor is proposed. A new composite feature for each block is used in this method. At first, the fingerprint image is partitioned into blocks, and then the product of variance and gradient factor is calculated as the new feature. Then the thresholds are computed adaptively. After segmentation, the isolated image blocks are wiped to get the final segmentation result. The experimental results show that this algorithm is effective and programmed easily.
Workflow management system JBPM which is open-source and based on J2EE architecture and its workflow model is introduced by combining practical experience in workflow and J2EE. An efficient, rapid and stable model of document flow system is designed with process design tools JPDL, and on the basis of this model definition and in the premise of operating structure equivalent, conversion rules are raised to convert JBPM model to WF_logic. And then smooth of the WF_logic is validated by reduction rules of Petri net. Finally, the model is achieved successfully.
In this paper we present a forward-secure group signature scheme based on conic curve over ring Zn. Our scheme
with forward security has effectively mitigated the damage caused by key exposure, and we use the dynamic
accumulators on the conic curve to remove members. The security of the scheme is based on the difficulty of integer
factorization and calculating the discrete logarithm on conic curve over the ring Zn. The scheme on conic curve has
some advantages as follow: Plaintext embedding is convenient, and the speed of computing inverse element is fast, and
element order calculation and the point operation on curve are more easily, etc. Therefore it is easier to accomplish.