基于WSN的智能路灯控制系统的设计与实现

针对目前城市路灯控制系统存在的问题,提出了一种基于无线传感器网络(WSN)的智能路灯控制系统设计方案.系统以STC89C52RC为控制核心,nRF905为无线收发模块核心芯片,并配以相应的亮度自适应调节模块和传感器模块.实验证明,本装置能根据环境的光照强度和温度等的变化进行自适应调节亮度,同时还可以实现远程监测路灯,是一种智能化、网络化的控制系统.     

融合纹理特征和阴影属性的阴影检测方法

为了解决智能视频监控中阴影对目标检测、跟踪和识别的影响,提出了一种融合纹理和阴影属性的阴影检测去除算法。分析了像素点在阴影覆盖前后它的纹理变化规律,改进了LBP算子对噪声敏感的缺点,根据像素点基于改进LBP算子的纹理值在当前帧和背景帧的差异检测出候选阴影区域。根据光照模型分析得到阴影点具有相同的亮度比值,根据阴影的亮度比值统计数据排除非阴影点,并在亮度比值空间做区域生长得到完整的阴影区域。实验结果表明,该方法能够快速、准确地检测出重阴影和浅阴影。     

航空影像色彩一致性处理算法研究

航空影像的色彩一致性处理,又称影像匀光匀色,是正射影像生产过程中的重要环节之一,本文从色彩学、统计学、人体视觉等多角度出发,通过适当地改变原始影像亮度、对比度,提出了解决影像中大面积雾霭的方法,对于影像拼接之后出现的不同影像间色彩反差明显的现象,通过调整影像统计直方图,取得了很好的效果。     

基于双直方图均衡的自适应图像增强算法

基于双直方图均衡算法,提出一种自适应图像增强算法。该算法综合考虑图像的熵及输入输出图像的亮度均值差,自适应地选择合适的阈值将图像分割成2个子图进行双直方图均衡和灰度均匀化处理,使得输出图像的亮度均值和原图接近的同时输出图像的熵尽可能大,并避免了过增强现象的出现。实验结果证明,该处理方法能取得较好的增强效果。     

融合颜色和CS-LBP纹理的运动阴影检测

针对现存阴影检测方法存在的实时性和精确性兼顾不周的问题, 提出加权融合颜色和纹理特征的阴影检测方法: 首先利用HSV颜色信息提取疑似阴影点; 其次, 通过阴影的亮度比计算阴影亮度隶属度, 对于高亮度隶属度的疑似阴影点, 直接判定为阴影点, 减少了纹理检测的计算量; 然后对低亮度隶属度的疑似阴影点提取高效的CS-LBP纹理, 并进行纹理匹配, 根据纹理的相似程度及阴影空间分布特点, 计算出纹理隶属度; 最后, 根据实际中纹理随亮度变化的特点, 提出了依据亮度比自适应调整纹理隶属度权重的特征融合方法, 进行有效的阴影检测. 实验表明, 本文方法实时性良好, 可去除自阴影, 分割精度较佳, 隶属度方法的使用, 使本方法对光照变化及噪声更具有鲁棒性.     

High‐mobility self‐aligned top‐gate oxide TFT for high‐resolution AM‐OLED

High‐mobility and highly reliable self‐aligned top‐gate oxide thin‐film transistor (TFTs) were developed using the aluminum reaction method. Al diffusion to the oxide semiconductor and homogenization of the oxygen concentration in the depth direction after annealing were confirmed by laser‐assisted atom probe tomography. The high mobility of the top‐gate TFT with amorphous indium tin zinc oxide channel was demonstrated to be 32 cm²/V s. A 9.9‐in. diagonal qHD active‐matrix organic light‐emitting diode (AM‐OLED) display was fabricated using a five‐mask backplane process to demonstrate an applicable solution for large‐sized and high‐resolution AM‐OLEDs.     

Optimization of bi‐layered nano‐wire grids as high‐efficiency polarizers for power recycling in liquid‐crystal displays

Abstract— Bi‐layered Al nano‐wire grids (N WGs) are proposed as high‐efficiency polarizers for power recycling in liquid‐crystal displays (LCDs). In comparison with single‐layered NWGs, the bi‐layered scheme is more cost‐effective with both less and more controllable fabrication steps. Two types of 150‐nm‐period NWGs with different cross sections were characterized and theoretically analyzed. A TM transmittance of over 66% and a contrast ratio as high as 8000 in the visible range were calculated. Furthermore, 5–8% increase in TM transmittance and an almost 20% enhancement in contrast ratio are achievable. The NWG sheet with a large contrast ratio as well as a high optical throughput acts as a reflective polarizer in the power‐recycling system of LCD backlight units. A total transmittance of above 70% in the visible region is predicted for the power‐recycling process, which is at least 9% higher in total light efficiency than the claimed result of commercial dual brightness‐enhancement film (DBEF).     

Color‐tuning projection system for adaptive combination of high brightness and wide color gamut

Abstract— The demand for projectors with high brightness and wide color gamut has been increasing; however, UHP lamp projectors cannot deliver those two qualities efficiently and simultaneously because of its color‐separation system. The newly developed projection system — “Color‐Tuning Projection System” — realizes the adaptive combination of high brightness and wide color gamut with one projector. This projector features a fourth liquid‐crystal panel — “Color Tuner” — with a 3LCD optical engine, which controls yellow light separately from the RGB light of a UHP lamp. This color‐tuner‐based optical engine — “Color‐Tuning Optical Engine” — and a new color‐conversion signal‐processing algorithm — “Adaptive Color Conversion Algorithm” — controls the yellow‐light volume and corrects color‐shifted pixels according to the brightness and chromaticity analysis of the input image, key technologies of the Color‐Tuning Projection System. This additional panel system enables the projector to ach ieve up to 115% higher brightness and 120% wider color gamut according to the input image. This paper presents an innovative design concept, a novel technology regarding brightness and a color‐gamut conversion projection system, and the characteristics of the prototype.     

神经网络用于反演微波亮度温度分布

将神经网络用于反演目标的微波亮度温度分布,提出了视在温度的神经网络迭代反演法。该方法利用神经网络正向模型提供反演误差对输入的梯度信息,利用该梯度信息进行迭代得到最优反演结果。利用该方法对水面在35GHz频段的视在温度进行反演所得的结果显示,该方法优于Holms反演法及HFR反演法。从视在温度中剔除散射辐射温度得到目标的亮度温度。     

Contrast limited fuzzy adaptive histogram equalization for enhancement of brain images

Contrast limited fuzzy adaptive histogram equalization (CLFAHE) is proposed to improve the contrast of MRI Brain images. The proposed method consists of three stages. First, the gray level intensities are transformed into membership plane and membership plane is modified with Contrast intensification operator. In the second stage, the contrast limited adaptive histogram equalization is applied to the modified membership plane to prevent excessive enhancement in contrast by preserving the original brightness. Finally, membership plane is mapped back to the gray level intensities. The performance of proposed method is evaluated and compared with the existing methods in terms of qualitative measures such as entropy, PSNR, AMBE, and FSIM. The proposed method provides enhanced results by giving better contrast enhancement and preserving the local information of the original image. © 2017 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 27, 98–103, 2017