The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Aiming at the problem that ViBe (Visual Background extractor) algorithm is sensitive to illumination variation, an improved ViBe algorithm is proposed in this paper. First, a brightness reference image is build, which represents the brightness level of background. Second, adjust the brightness of current frame, which is changed by illumination variation, back to the reference images brightness level...
To explore the effect of oil film temperature on hydro-viscous drive (HVD), a 3D physical model of the oil film was established. According to the principle of computational fluid dynamics (CFD), the model was solved by using finite volume method (FVM), and a HVD test-bed was developed to verify the theoretical analysis. The results show that the relationship between the temperature and the time is...
In H.264/AVC, the encoders have to try all the block types (16×16, 16×8, 8×16, 8×8, 8×4, 4×8 and 4×4) for each macro-block motion estimation and inter mode decision. All motion vectors and residuals are passed into Lagrange rate distortion (RD) cost model to calculate all RD cost values exhaustively, which introduce considerable computation complexity and resource demanding. In this paper, we introduce...
With the rapid development of computer, applied mathematics and reservoir engineering, which have provided a technology platform for the scientific management, digitalization and informationization of reservoir, the integration research of geological modeling and numerical simulation is more and more emphasized in oilfield. In this paper, the mathematical theory of streamline simulation is given....
Current large scale image retrieval engines rely heavily on the surrounding text information, which inevitably includes some irrelevant images in the retrieval results due to the noisy environment. To improve the retrieval performance, we propose an unsupervised web image re-ranking method by incorporating images' visual information. Our method can automatically select a set of representative images...
The risk assessment for network information system has experienced a stage from rule-based questionnaire investigation to model-based assessment. Many graph-based models have been proposed and applied to risk assessment. Attack Graph is widely used one. But attack graphs grow exponentially with the size of the network. In this paper, we propose a comprehensive framework for network vulnerabilities...
Going beyond vulnerability scanning tools that make lists of known vulnerabilities locating on given individual hosts, attack graphs identify all possible attack paths that end in a state where an attacker has successfully achieved his goal. But the algorithmic complexity grows exponential in the size of the network. The access graph is proposed as a complement to the attack graph approach which is...
Background subtraction is a popular moving object detection technique, but its performance is dependent of the accuracy of background model. In this paper, the theory of sequential kernel density approximation is first introduced to background modeling. To this end, a novel background subtraction method for moving object detection is proposed. Various real video sequences have been used to test this...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.