排序方式: 共有49条查询结果,搜索用时 15 毫秒
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Most semantic video search methods use text-keyword queries or example video clips and images. But such methods have limitations. To address the problems of example-based video search approaches and avoid the use of specialized models, we conduct semantic video searches using a reranking method that automatically reorders the initial text search results based on visual cues and associated context. We developed two general reranking methods that explore the recurrent visual patterns in many contexts, such as the returned images or video shots from initial text queries, and video stories from multiple channels. 相似文献
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Visually searching the Web for content 总被引:1,自引:0,他引:1
New visual information in the form of images, graphics, animations and videos is published on the World Wide Web at an incredible rate. However, cataloging it exceeds the capabilities of current text-based Web search engines. WebSeek provides a complete system that collects visual information from the Web by automated agents, then catalogs and indexes it for fast searching and retrieval 相似文献
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This study fabricated hydrogenated diamond-like carbon/silver bioceramic films on glass substrates using radio frequency magnetron sputtering with a single silver target in an atmosphere of Ar/CH4 mixture. The effects of applied power on the composition and microstructure of bioceramic film were evaluated. A phase transformation, amorphous diamond-like carbon → nano-silver precipitation → nano-silver growth in the amorphous diamond-like carbon matrix was observed during sputtering. The film growth rate, surface roughness, silver content and size of silver nanoclusters in the films all increased with the silver target power due to the higher flux of sputtered silver species toward the substrate. 相似文献
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Large-scale concept ontology for multimedia 总被引:12,自引:0,他引:12
Naphade M. Smith J.R. Tesic J. Shih-Fu Chang Hsu W. Kennedy L. Hauptmann A. Curtis J. 《Multimedia, IEEE》2006,13(3):86-91
As increasingly powerful techniques emerge for machine tagging multimedia content, it becomes ever more important to standardize the underlying vocabularies. Doing so provides interoperability and lets the multimedia community focus ongoing research on a well-defined set of semantics. This paper describes a collaborative effort of multimedia researchers, library scientists, and end users to develop a large standardized taxonomy for describing broadcast news video. The large-scale concept ontology for multimedia (LSCOM) is the first of its kind designed to simultaneously optimize utility to facilitate end-user access, cover a large semantic space, make automated extraction feasible, and increase observability in diverse broadcast news video data sets. 相似文献
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Xu Dong Yan Shuicheng Lin Stephen Huang Thomas S. Chang Shih-Fu 《IEEE transactions on pattern analysis and machine intelligence》2009,31(10):1913-1920
The success of bilinear subspace learning heavily depends on reducing correlations among features along rows and columns of the data matrices. In this work, we study the problem of rearranging elements within a matrix in order to maximize these correlations so that information redundancy in matrix data can be more extensively removed by existing bilinear subspace learning algorithms. An efficient iterative algorithm is proposed to tackle this essentially integer programming problem. In each step, the matrix structure is refined with a constrained Earth Mover's Distance procedure that incrementally rearranges matrices to become more similar to their low-rank approximations, which have high correlation among features along rows and columns. In addition, we present two extensions of the algorithm for conducting supervised bilinear subspace learning. Experiments in both unsupervised and supervised bilinear subspace learning demonstrate the effectiveness of our proposed algorithms in improving data compression performance and classification accuracy. 相似文献
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Ching-Jui Shih Shih-Fu Ou Chia-Hung Yeh Chao-Sung Lin Yung-Ning Pan 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):2329-2334
Microfabrication was employed in the fabrication of diamond dressers. Diamond-nickel composite was utilized for fabricating columnar cutting tips and compared with those fabricated by the brazing connective approach. In this study, microcolumns with diamond grits embedded in the nickel deposit electroplated on the substrate with guidance of the resist mold can improve the population density of working diamond grits in the diamond dresser. Moreover, the load force is dispersed on the plurality working diamond grits within one column, which in turn increasing in the durability of the dresser. This technique can produce diamond dressers with improved uniformity in both the distribution and protrusion control of microcolumn diamond cutting tips. In addition, the presently developed diamond dressers exhibit an increase in material removal rate by some 15 %, while, at the same time, maintain a relatively low worn rate as compared with the commercially available dressers. This microcolumn (e.g., diamond-nickel composite) is efficient to share the applied load and also extends tool’s life during polishing. 相似文献
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Poor quality of resistance spot welding (RSW) often causes quality issues like structural integrity and noise in the car body assembly. Research activities for reliable monitoring methods of RSW quality have therefore been extensive. So far, most of the monitoring methods found in literature are good for off-line utilization only and thus very expensive to apply. This paper introduces into a real-time and in-situ RSW quality monitoring method, which takes the input electrical impedance of the welding system as the monitoring signature. This signature is obtained by probing and processing the input voltage and current throughout the welding process. As input impedance characterizes a dynamic system, its variation with time reveals the conditions of the welding process which result in the final weld quality. By recognizing the pattern of the real part by an artificial neural network, we demonstrate that the weld quality could be classified non-destructively and automatically. Due to the fast signal collecting and processing, the quality monitoring is finished almost in real-time, i.e., classification can be completed before the next welding process is started. Another feature of the method is being in-situ because monitoring action does not jeopardize the welding operation or alter any of the welding parameters in general. 相似文献
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Ming-Tsai Liang Shih-Han Wang Yu-Lun Chang Hsing-I Hsiang Huang-Jhe Huang Meng-Huan Tsai Wen-Cheng Juan Shih-Fu Lu 《Ceramics International》2010
Iron oxide synthesis via a continuous hydrothermal and solvothermal reaction were studied. In the hydrothermal synthesis, fine α-Fe2O3 (hematite) particles were obtained at 250–420 °C and 30 MPa. The α-Fe2O3 crystals were grown in sub-critical water via a dissolution and precipitation process. The growth of α-Fe2O3 crystals in supercritical water was suppressed due to the rather low solvent power of water. Crystalline Fe3O4 was obtained as the temperature was raised above the supercritical state in the solvothermal preparation. Isopropanol (IPA) was oxidized in acetone which provided a reducing atmosphere. Acetone molecule adsorption onto the Fe3O4 particle surface inhibited crystallite growth. 相似文献
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Electrostrictive actuators are a class of smart transducers with a great potential for many submicron motion applications. A major challenge for the electrostrictive actuators exists in the control of such ultra-precision motions, which are often seriously influenced by the intrinsic behaviors of electrostrictive material like non-linearity, hysteresis and creep. Based on Newton's method, this paper presents a new iterative control algorithm to improve the positioning and tracking performances of a linear multilayer electrostrictive actuator. In this algorithm, the iterative gain is not fixed but variable according to the previous output feedback and the nominal input/output relationship of the electrostrictive actuator. The convergence of this algorithm is theoretically proved quadratic and experimentally verified correct. A comparison of effectiveness of the new algorithm with that of the conventional proportional integral (PI) control and gain-fixed iterative control algorithms is made. The results show that using this new iterative control algorithm both the stability and the speed of submicron motion control have been obviously improved for the tested electrostrictive actuator. 相似文献