最新刊期
期 9 ， 2019
- 摘要：
Cholesteric liquid crystals(CLCs) are widely used in optical filters, but their bandwidth is too wide to be used in narrow bandwidth filters. The reflection bandwidth of blue phase liquid crystal(BPLC) filter is narrower than that of CLCs and the filter shows good stability before and after polymerization and templated process. Therefore, the fabrication and optical properties of templated mono-domain blue phase liquid crystals are investigated in this paper. By multi-template integration, the flexible fabr 关键词：blue phase liquid crystal;filters;polymer template;reflection bandwidth- 336
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发布时间：2020-07-05 - 摘要：
In order to obtain OLED with low driving voltage and high efficiency, a kind of exciplex mCP:PO-T2T is introduced in this paper. Firstly, by testing the photoluminescence spectra of mCP, TPBi, PO-T2T, mCP:TPBi and mCP:PO-T2T films, it is determined that mCP:TPBi and mCP:PO-T2T possess exciplex performance requirements. The blue OLEDs are fabricated by using the above two exciplexes as the host of the luminescent layer. The device structure is HATCN(10 nm)/TAPC(40 nm)/TCTA(10 nm)/mCP(10 nm)/mCP:X:FIrpic(20 n 关键词：OLED;exciplex;blue light;warm white light- 516
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发布时间：2020-07-05 - 摘要：In order to obtain fast response electro-optic devices, a dual-frequency-driven blue phase liquid crystal (DF-BPLC) was obtained through preparing dual-frequency liquid crystal molecules and adding into a blue phase host. The texture and phase transition behavior of the DF-BPLC were observed by polarizing microscopy (POM) at different electric field frequencies, and it was found that it could have a great influence on the temperature range of blue phase (BP). Under low frequency electric field, the BP temperature range of DF-BPLC can be broadened under the effects of electric field orientation, bending structure and flexoelectricity of DFLC. The prepared DF-BPLC material exhibits not only frequency responsive characteristic, but also excellent electro-optic property, which may have great application prospects in optoelectronic devices.关键词：liquid crystal;blue phase;dual frequency liquid crystal;frequency response
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发布时间：2020-07-05 - 摘要：With the development of display technology, the thickness of Ti/Al/Ti materials becomes thicker and the wiring becomes narrower and narrower. At present, the conventional design of LTPS display technology is to use inorganic film on Ti/Al/Ti substrates. In the new design of flexible OLED display technology, Ti/Al/Ti substrates are gradually using organic film. The challenge of Ti/Al/Ti dry etching process is becoming more and more serious. In this paper, the effect of BCl3 gas on the side morphology of Ti/Al/Ti and the etching rate of photo resist in conventional Ti/Al/Ti dry etching process is studied. With the increase of BCl3 gas flow rate, the thickness of Ti/Al/Ti side protective film is thinner and thinner, and the etching rate of photo resist is smaller and smaller. Based on the research and analysis, it is easy to cope with the new process of dry etching Ti/Al/Ti substrates as organic films.关键词：Ti/Al/Ti;dry etch;BCl3;side protection;photo resist etch rate
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发布时间：2020-07-05 - 摘要：
With the development of medical display technology, medical endoscope camera system has developed from the mainstream 2D (Two Dimensions) display to 3D (Three Dimensions) display, and image definition has also changed from high definition (HD) to ultra high definition (UHD). Therefore, this paper designed and developed a 4K medical stereo display system based on FPGA. Firstly, the system carried on dual 3G-SDI image acquisition and YUV to RGB format conversion. Secondly, the VPSS core provided by Xilinx was 关键词：medical imaging;stereoscopic display;FPGA;4K- 356
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发布时间：2020-07-05
Materials and Devices
- 摘要：
The automatic recognition of microscopic image cells in leucorrhea routine has been an unsolved problem. Epithelial cells are the main visible components in leucorrhea microscopic images, which can reflect the indicators such as cleanliness directly. Aiming at the low efficiency of subjective judgment in leucorrhea routine, a new method for detecting epithelial cells in leucorrhea microscopic images based on texture features was proposed. Firstly, the morphological method was used to extract the foreground 关键词：epithelial cells;LBP;texture feature;SVM- 344
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发布时间：2020-07-05 - 摘要：Aiming at the defect image detection of live knots, dead knots, wormhole and so on, a wood defect image detection method based on depth learning was proposed. Firstly, by training Faster-RCNN network, a detection model for locating and recognizing wood defects is obtained. Secondly, the image is denoised by NL-Means method, and image enhancement is achieved by linear filtering, adjusting contrast and brightness. Thirdly, the image is processed by binarization, and the edge feature points of defects are extracted according to the difference of pixel values to realize wood defects fine segmentation. Finally, the ellipse fitting method is improved to realize the ellipse fitting of wood defect edge point set, and a new wood defect processing scheme is provided. The experimental results show that the algorithm has better wood defect location and classification ability, and gets better segmentation and fitting effect. The filling volume of wood can be reduced by about 10% in the process of defect repair.关键词：image detection;deep learning;wood defects;edge detection;elliptic fitting
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发布时间：2020-07-05 - 摘要：
Aiming at the characteristics of night images, such as low brightness and most of the image details concentrating in the low gray range, a night image enhancement method based on pixel level adaptive fusion is proposed. Firstly, a high pass filter is used to filter most of the dark background information of the image, so as to enhance the gray details of each region of the image. Then, the filtered image is fused with the original image in the way of pixel level weighting adaptively. The two weights of each 关键词：night image enhancement;high pass filter;image fusion;adaptive weight- 334
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发布时间：2020-07-05 - 摘要：
In order to overcome the low detection accuracy and high false alarm rate of anomaly target detection in hyperspectral image based on Kernel RX anomaly detector, the new hyperspectral image anomaly target detection algorithm for optimal bands subspace is proposed on the basis of fully analyzing the characteristics of hyperspectral image data. First, the bilateral filtering method is used to filter the hyperspectral image, which makes the background information of hyperspectral images be suppressed by full u 关键词：hyperspectral remote sensing imagery;anomaly target detection;bilateral filtering;bands subspace- 334
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发布时间：2020-07-05 - 摘要：
Airborne displays usually use the brightness automatic adjustment algorithm based on Weber-Fechner law to achieve automatic brightness adjustment. Due to the difference in design, materials, devices and assembly of the internal ambient light detection conversion circuit and LED backlight adjustment control circuit, the actual ambient light-brightness curve deviates from the standard curve, resulting in an automatic brightness change effect that does not meet the requirements. In order to make the ambient li 关键词：airborne displays;Weber-Fechner law;brightness;automatic adjustment algorithm;algorithm optimization- 339
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发布时间：2020-07-05 - 摘要：
Realizing accurate estimation of noise parameters in digital images is of great significance for improving the quality of image processing. When the sparse principal component analysis is performed on the image contaminated by Gaussian white noise, the mean value of the load vector of some principal components and the standard deviation of Gaussian white noise show a certain linear relationship. Based on this feature, this paper proposes a fast and accurate image noise estimation method. In this method, a p 关键词：sparse principal component;Gaussian white noise;image noise estimation- 327
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发布时间：2020-07-05 - 摘要：
The adaptive optics (AO) system can provide real-time compensation for atmospheric turbulence. However, an AO image is usually of poor contrast and brings about a loss in quality. In this paper, a adaptive optical image restoration method was presented via the Point Spread Function (PSF) reconstruction and improved Maximum A Posteriori (MAP) estimation. Firstly, combining the observed conditions and AO system characteristics, a predicted PSF model for the wavefront phase effect was developed. Secondly, the 关键词：image restoration;Adaptive Optics (AO);Point Spread Function (PSF);Maximum A Posteriori (MAP)- 361
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发布时间：2020-07-05 - 摘要：Aiming at the problems of transmission complexity and external noise distortion of low-voltage power line communication technology, based on the orthogonal frequency division multiplexing (OFDM) modulation technology model, the transmission model of low-voltage power line channel is established. The low-voltage power line communication system is simulated and studied in MATLAB software. The results show that OFDM can effectively improve the performance of low-voltage power line communication system and significantly reduce the noise impact of communication system. The technology has good market application prospects and competitiveness.关键词：low-voltage power line;orthogonal frequency division multiplexing modulation technology;communication transmission;anti-noise
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发布时间：2020-07-05
Image Processing
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