Darui
Darui Li, Lianyungang City CN
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20120251007 | Robust Large-Scale Visual Codebook Construction - Techniques for construction of a visual codebook are described herein. Feature points may be extracted from large numbers of images. In one example, images providing N feature points may be used to construct a codebook of K words. The centers of each of K clusters of feature points may be initialized. In a looping or iterative manner, an assignment step assigns each feature point to a cluster and an update step locates a center of each cluster. The feature points may be assigned to a cluster based on a lesser of a distance to a center of a previously assigned cluster and a distance to a center derived by operation of an approximate nearest neighbor algorithm having aspects of randomization. The loop terminates when the feature points have sufficiently converged to their respective clusters. Centers of the clusters represent visual words, which may be used to construct the visual codebook. | 10-04-2012 |
Darui Wang, Shenzhen CN
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20140292265 | Active Charge Equilibrium System for Lithium Battery Pack - An active charge equilibrium system for lithium battery pack consists a lithium battery pack composed of connecting multiple cells in series, including a multiplex module, control module and multiple equilibrium control module, which each segment of the cells are connected to the multiplex module in sequence, a voltage signal is converted into a digital signal via the control module to compare the voltages of the cells and select the cell with lower voltage. Further, the control module enables the equilibrium control module corresponding to the cell with the lower voltage to work. A pulse width modulator adjusts the output pulse width according to output current and voltage signal from a signal feedback module for controlling current and voltage to charge the cell. As the voltage of the cell reaches a constant current first and a constant voltage second, the control module turns off said equilibrium control module. | 10-02-2014 |
Darui Xu, Beijing CN
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20140316691 | METHOD AND TERMINAL FOR PROVIDING ELECTRONIC MAP - A method for a device to provide an electronic map includes receiving user input to start an electronic map; obtaining, responsive to the receiving, electronic map filtrating information; and determining, from a plurality of electronic maps, an electronic map matching the electronic map filtrating information. | 10-23-2014 |