This paper presents an effective algorithm for calibrating the extrinsic parameters between a camera and a laser range finder whose trace is invisible. On the basis of an analysis of three possible features, we propos...
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This paper presents an effective algorithm for calibrating the extrinsic parameters between a camera and a laser range finder whose trace is invisible. On the basis of an analysis of three possible features, we propose to design a right-angled triangular checkerboard and to employ the invisible intersection points of the laser range finder's slice plane with the edges of the checkerboard to set up the constraints equations. The extrinsic parameters are then calibrated by minimizing the algebraic errors between the measured intersections points and their corresponding projections on the image plane of the camera. We compared our algorithm with the existing methods by both simulations and the real data of a stereo measurement system. The simulation and experimental results confirmed that the proposed algorithm can yield more accurate results.
A new approach to control system design has been implemented in the software described here. The set of controllers simultaneously satisfying multiple design specifications can be obtained without performing a traditi...
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A new approach to control system design has been implemented in the software described here. The set of controllers simultaneously satisfying multiple design specifications can be obtained without performing a traditional optimization procedure. The most notable strength of the method is that the entire set of controllers, satisfying some of the most important specifications such as stability and robust stability can be described first by sets of linear inequalities within which performance is sought. This paper describes the basic principle of the design method along with a series of examples for illustration.
A new design for broadband EMC double ridged guide horn (DRGH) antennas is presented. A conventional 1-18 GHz double ridged guide horn has been investigated rigorously. Then some modifications have been performed in t...
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ISBN:
(纸本)9290929375
A new design for broadband EMC double ridged guide horn (DRGH) antennas is presented. A conventional 1-18 GHz double ridged guide horn has been investigated rigorously. Then some modifications have been performed in the structure of the antenna. Elimination of radiation pattern deficiencies especially at higher frequencies accompanying with better EM characteristics of the antenna have been the main purposes for these modifications. The main modifications are imposed on the profile of ridges, H-plane flares and E-plane flares. The resulted antenna not only has considerably better performance but also has smaller physical dimensions and less weight in comparison with the conventional one.
In this paper, we propose a low-power encoding scheme for serial buses (LESB) which can be used in SoCs. The scheme makes use of a look-up-table for encoding the input data before the parallel to serial conversion and...
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Artificial music composition is one of the ever rising problems of computer science. Genetic Algorithm has been one of the most useful means in our hands to solve optimization problems. By use of precise assumptions a...
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Artificial music composition is one of the ever rising problems of computer science. Genetic Algorithm has been one of the most useful means in our hands to solve optimization problems. By use of precise assumptions and adequate fitness function it is possible to change the music composing into an optimization problem. This paper proposes a new genetic algorithm for composing music. Considering entropy of the notes distribution as a factor of fitness function and developing mutation and crossover functions based on harmonic rules and trying to keep the melodies intact during these processes would result in a musical piece pleasant to human ears and interesting for human mind. This algorithm does not have the constraints of the previous algorithms. Restraining mutation and crossover functions with a goal of producing melodies based on acceptable melodies composed by humans, this algorithm is not bound to any genre, instrument or melody. The experimental results of this approach show that it is near to the human composing and the results produced from it are more acceptable than the ones produced by its predecessors.
In this paper we have considered systems in which agents communicate via their environment. In these systems the agents do not have direct and explicit communication with each other and instead they have implicit comm...
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In this paper, we propose a low-power encoding scheme for serial buses (LESB) which can be used in SoCs. The scheme makes use of a look-up-table for encoding the input data before the parallel to serial conversion and...
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In this paper, we propose a low-power encoding scheme for serial buses (LESB) which can be used in SoCs. The scheme makes use of a look-up-table for encoding the input data before the parallel to serial conversion and a look-up-table after serial to parallel conversion in the decoder. Using the look-up table, the input symbols are replaced with some codewords which have some redundant bits compared to the original symbols. The serial transmission of the codewords leads to lower switching (transition) activity compared to that of the original transmission of the input symbols. The simulation results show that the when one redundant bit is used, the proposed scheme reduces the transition (switching) activity on the serial bus for uniform data more than 18% with a reduction of 11% in the throughput. More power reduction may be achieved by adding more redundant bits to original input symbols
In this paper, we introduce a new topology for network on chips which is named multi-level mesh topology. The multi-level mesh topology is basically similar to the 2D-mesh with this difference that we have several mes...
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In this paper, we introduce a new topology for network on chips which is named multi-level mesh topology. The multi-level mesh topology is basically similar to the 2D-mesh with this difference that we have several meshes that have some common routers. This architecture reduces the latency and the dynamic power consumption in NoCs and can improve the communication throughput in high traffic applications. This architecture reduces the latency of 3 x 3, 5 x 5, and 7 x 7 2-level mesh architectures about 12.5%, 21.4%, and 18.5% related to mesh architecture, respectively. The results are expected to improve further if a better adaptive routing algorithm is utilized.
In this paper, we propose a mesochronous scheme for communication over serial buses in network on chips (NoC). The technique, which removes metastability errors in mesochronous communications, makes use of only one st...
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In this paper, we propose a mesochronous scheme for communication over serial buses in network on chips (NoC). The technique, which removes metastability errors in mesochronous communications, makes use of only one strobe line with the bus. The strobe line toggles once with every frame of the data. In the suggested method, the frequencies of the transmitter and the receiver are independent with some tolerable difference. The results of HSPICE simulations in a 0.13 mum standard CMOS technology show a 3.65 Gbps as the maximum transmission bandwidth of the technique. The idea can be applied to parallel buses without any change in the control circuit.
In this paper the optimized structural parameters of the multilayer high-speed MMICs are obtained to minimize the crosstalk of the orthogonal microstrip lines in 1-20 GHz frequency range. The crosstalk is calculated b...
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In this paper the optimized structural parameters of the multilayer high-speed MMICs are obtained to minimize the crosstalk of the orthogonal microstrip lines in 1-20 GHz frequency range. The crosstalk is calculated by lumped circuit model of the cross-region using quasi-static methods and solving the related coupled integral equations. The spectral domain Green's function of the structure has been determined by utilization of the real-valued images technique. By using predetermined lumped circuit model, the effects of the physical parameters such as dielectric constant, height and number of layers and width of the traces have been investigated on the coupling factor of crossing interconnections
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