最新刊期
期 8 ， 2016
- 摘要：
Flexible organic light emitting diodes (FOLEDs) have attracted an amount of attentions due to their advantages in power-consumption and color-quality for lighting and display applications. Although the indium-tin-oxide (ITO)-coated glass substrates are widely used in OLEDs, their brittle nature limits the further development of flexible OLEDs for some special products. Here, we present a device structure which uses plastic PET as the substrate and spin-coated high-conductivity PEDOT: PSS as the anode. Based 关键词：flexible substrate;high efficiency;organic light emitting diode;nano imprint- 66
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发布时间：2020-07-07 - 摘要：Based on the experimental phenomena of flexoelectric response at defect sites in nematic inversion walls conducted by Pramoda Kumar et al., we gave the theoretical analysis using the Landau-de Gennes theory. When a direct-current electric field normal to the plane of substrate is applied to the parallel aligned nematic liquid crystal cell with weak anchoring, the rotation of ±1 defects in the narrow inversion walls can be exhibited. The free energy of liquid crystal molecules around the +1 defect site was formulated and the electric field driven structural changes at the defect site characterized by polar and azimuthal angles of the local director were simulated. The results reveal that the deviation of azimuthal angle induced by flexoelectric effect are consistent with the switching of extinction brushes at the +1 defect obtained in the experiment conducted by Pramoda Kumar et al.关键词：liquid crystal;flexoelectric effect;± defect;Frank theory
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发布时间：2020-07-07 - 摘要：
In order to analyze the misalignment errors of the liquid crystal spectropolarimetric system and reduce measurement errors, a research method for misalignment errors of liquid crystal polarizer is proposed. By transforming the misalignment errors of polarizing angle into Stokes vector transfer errors, the errors covariance matrix is derived based Stokes vectors and Mueller matrix. And the relationship between weight coefficients and phase delay and the change of quality factor with different incident light 关键词：misalignment error;liquid crystal spectropolarimetric system;covariance matrix;Stokes vector- 29
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发布时间：2020-07-07 - 摘要：
The capacitance of liquid crystal cell is associated with the value of external applied voltage. When the temperature of the liquid crystal is changed, the capacitance of liquid crystal cell will also change even if the applied voltage has a certain value. In order to research the influence of temperature, adopting the method of alternating current (AC) bridges, the capacitance of parallel aligned nematic (PAN) liquid crystal cell filled in liquid crystal 5CB is measured experimentally, where the precision 关键词：capacitance of liquid crystal cell;alternating-current bridges;parallel aligned nematic;dielectric constant- 74
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发布时间：2020-07-07 - 摘要：
In order to meet the demand of high transmittance for large size products, we research the application of negative LC in ADS technology. First, we introduce the development progress and main features of ADS technology. And then, we analyze the relationship between negative LC parameters and ADS display characteristics. Finally, we evaluate the features of different negative LC matching with different PI materials. Among the parameters of negative LC, Δn greatly affects on transmittance, |Δε| and K mainly im 关键词：wide view technology;advanced super dimension switch technology;negative liquid crystal;image sticking- 135
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发布时间：2020-07-07 - 摘要：The azimuthal anchoring energy can be calculated by designing nematic molecular alignment at two substrates to build a polarization grating configuration, based on the Frank elastic theory of nematic liquid crystals. The theoretical results can provide a powerful theoretical guidance for experimental measurement. In this paper, we study the azimuthal anchoring energy based on the elastic anisotropy of the nematic liquid crystals and obtain the analytic solutions of azimuthal anchoring energy related to the widths of dark stripes. The elastic anisotropy has a significant influence on the azimuthal anchoring energy. It is necessary to consider the elastic anisotropy to study the azimuthal anchoring energy because of the anisotropy of liquid crystal.关键词：nematic;azimuthal anchoring energy;polarization grating configuration;the elastic anisotropy
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发布时间：2020-07-07 - 摘要：
To enhance the electron injecting and transporting ability and improve the performance of organic light-emitting device, the organic electron transport material Bphen was electrically doped by using CsN3 as n-type dopant in this work. The devices of ITO/MoO3(2 nm)/NPB(50 nm)/Alq3(30 nm)/Bphen(15 nm)/Bphen:CsN3(15 nm, x%, x=10, 15, 20)/Al(100 nm) were prepared. The experimental results show that the CsN3 is an effective n-type dopant. The electron injection barriers was reduced and the electron injecting and 关键词：CsN3;n-type dopant;organic light-emitting devices;current efficiency- 35
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发布时间：2020-07-07
Material and Device
- 摘要：
In order to quickly detect pavement cracks and classify them from complex pavement environment, a method based on multi-scale matrix filtering is proposed. The method which based on TMS642 DSP platform from TI can process a large number of complex data with high speed in real-time, and effectively process pavement images from multi scales to eliminate the noise, then highlights the characteristics of pavement cracks. Characteristics of pavement cracks can be extracted by analyzing the feature and feature di 关键词：crack detection;filtering;curvature;image segmentation- 24
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发布时间：2020-07-07 - 摘要：
A multi-focus image fusion algorithm based on undecimated dual-tree complex wavelet transform(UDT-CWT) domain and block principal pivoting method for nonnegative matrix factorization(BPP-NMF) is proposed. Firstly, combined with its shift invariance and good directional selectivity, the source images are decomposed to sub-band images with multi-scales and multi-directions by UDT-CWT, thus the low frequency sub-band coefficients and high frequency sub-band coefficients are obtained. The fusion strategy of low 关键词：undecimated dual-tree complex wavelet transform;nonnegative matrix factorization;block principal pivoting method;weighted regional energy;image fusion- 35
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发布时间：2020-07-07 - 摘要：In order to solve the problem of accurate and adaptive detection of infrared dim small targets, this paper proposes a new method based on median filter which combines top-hat algorithm and Canny algorithm.This method is different from the infrared dim target detection using traditional Canny algorithm.First, this method selected suitable window for image processing, using median filter to remove noise effectively and keep the image edge information at the same time.Then this method eliminates the effect of complex dynamic background by using top-hat algorithm. Finally, this method adopts adaptive Canny algorithm to extract the edge of infrared small target.Experimental results demonstrate the effectiveness and superiority of the proposed method, this design method which is self-adaptive can accurately locate the position of the small target, the SNR gain reaches more than 10 times. Besides, this method can eliminate noise and the effect of clouds. Moreover, this method has a certain degree of adaptability.关键词：infrared small target;Canny algorithm;median filtering;morphology
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发布时间：2020-07-07 - 摘要：
In order to improve the stability and the ability of autonomous tracking of electro-optical tracking system, multi-sensor data fusion algorithm and estimate of the availability of sensor data is researched. In this paper a multi-sensor data fusion algorithm for autonomous tracking was put forward. First, the variance was estimated according to the statistics data real timely. Secondly, the fusion of the sensor data was made based on the rule of least mean square error. Then an improved estimation formula of 关键词：multi-sensor;data fusion;autonomous tracking;error variance estimating- 43
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发布时间：2020-07-07 - 摘要：
With the popularization of high-speed rail, the screw loosening, body deformation and other safety issues gradually attract people's attention, and how to check the rail body is the research field. Using laser 3-dimension measurement model, when the line structure light scans high-speed rail body, it can estimate whether high-speed rail safety hazards exist according to the degree of distortion of the laser stripe. How to quickly and accurately extract the center line of the laser stripe has become the prim 关键词：median filter;OTSU;gray barycenter method;FPGA- 30
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发布时间：2020-07-07 - 摘要：In order to improve the tracking accuracy and enhance the adaptation ability in the complex environment of image processing system, a multi sensor fusion image tracking system based on CPCI architecture is designed. Aiming at high resolution and high frame rate image acquisition, target searching and tracking, the embedded image processing platform based on FPGA+DSP is designed and implemented. Using CPCI standard bus as data sharing channel, the real-time computation is done by the embedded image processing platform, data center completes data fusion of tracking results and system integrated control. Experimental results indicate that the system can realize multi-channel high resolution Camera Link or HD-SDI image fusion tracking processing, it has good real-time performance, high tracking precision and strong ability of expansion, and provides a reliable solution for image fusion tracking system.关键词：target tracking;DSP;FPGA;compact-PCI;data fusion
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发布时间：2020-07-07 - 摘要：
Aiming at the problem that dark channel prior model does not suit the image bright region, since dark channel estimate is too small, the estimated transmittance is small, and color distortion occurs, a new method for correcting dark channel has been proposed. One kind of inverse dark channel concepts have been proposed, dark channel and inverse dark channel of the haze image are fused to get a new dark channel, thereby obtaining more real bright area transmittance, effectively eliminating color distortion i 关键词：image haze removal;dark channel prior;inverse dark channel;bright region- 18
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发布时间：2020-07-07 - 摘要：
To develop an algorithm for haze removal based on the physics model, this paper proposes an improved and fast method for single image haze removal using dark channel prior. First, we introduce the degraded model for describing the formation of a haze image and several algorithms based on this model. Second, we introduce the method of He's single image haze removal using dark channel prior. The image quality of He's method is satisfactory, but it is a time consuming method because of refining the transmissio 关键词：haze removal;dark channel prior;estimate transmission;sobel filter- 37
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发布时间：2020-07-07
Driving and Controlling
- 摘要：This paper mainly introduce the use of ORB (Oriented FAST and Rotated BRIEF) algorithm on the non-overlapping cameras to handoff tracking target. When the target leaves camera 1, ORB algorithm is used to extract the feature points of the target.PROSAC (Sample Consensus PROSAC) algorithm is used to remove the outer points and persist valuable feature points. When the target is in the camera2, Vibe (Visual Background extractor) algorithm was used to get moving target which was into the camera2. We extract the characteristic points of the moving object that leave to be confirmed, removed outer points then matched the feature points extracted from Camera 1 and Camera2. If matching rate achieve the threshold that means tracking target is the same. Target is successful handoff and will be continue tracked in Camera2. Experimental results show that the scheme proposed in this paper, can handover target between the multi cameras in real time.关键词：non-overlapping;target handoff;feature matching;remove outer point
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发布时间：2020-07-07
Driving and Controllinging
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