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A fast motion estimation searching method based on the multi-start and concurrent algorithm 一种基于多启动并行算法的快速运动估计搜索方法
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144002.0140
于. Y. Fei, 林喆 Lin Zhe, 赵跃进 Zhao Yuejin, 董立泉 Dong Liquan, 康晓军 Kang Xiaojun
A novel searching method of matching block based on the concurrent and multi-start algorithm is presented to improve the search speed,accuracy and robustness in the fast operation of the block-matching motion estimation.The method of choosing starting points evenly is presented based on the characteristic of the block matching search,and the adaptive conditions and adaptive schedule is established based on the searching region.In the processing of iteration,the new method can not only adapt to the solution that lead the objective to the correct direction,but also adapt to the solution that have a little offset comparing with the objective.Therefore the concurrent and multi-start algorithm can be easy to keep from the trap of local minima effectively.The image processing system based on the DSP chip of TMS320C6415is used to make the experiment for the video with shaking images.The results of experiment show that,when the television broadcasting system of camera is PAL,the image resolution of video is 720×576pixels and the shaking motion between the adjacent images is in the scope of±40pixels,the computational complexity of block matching parameters based on the novel method is not more than one eighth of the computational complexity based on the full-search(FS)method,and the searching accuracy of the novel method is much greater than the other traditional fast searching method.The method can improve the searching speed and achieve the high searching accuracy at the same time.
为了在快速运行的块匹配运动估计中提高搜索速度、准确性和鲁棒性,提出了一种基于并行多启动算法的匹配块搜索方法。根据块匹配搜索的特点,提出了均匀选择起始点的方法,并根据搜索区域建立了自适应条件和自适应调度。在迭代过程中,新方法既能适应使目标指向正确方向的解,又能适应与目标偏差较小的解。因此,并行多启动算法可以有效地避免局部极小值的陷阱。采用基于DSP芯片tms320c6415的图像处理系统,对带有抖动图像的视频进行了实验。实验结果表明,当摄像机的电视广播系统为PAL,视频图像分辨率为720×576pixels,相邻图像之间的抖动运动在±40像素范围内时,基于新方法的块匹配参数的计算复杂度不超过基于全搜索(FS)方法的计算复杂度的八分之一,并且新方法的搜索精度远远大于其他传统的快速搜索方法搜索方法。该方法在提高搜索速度的同时,可以达到较高的搜索精度。
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引用次数: 1
Tensile stress measurement reasearch of anchor cable by using optical fiber Bragg grating 利用光纤光栅测量锚索拉应力的研究
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144002.0160
庄君刚 Zhuang Jun-gang, 赵振刚 Zhao Zhenggang, 李英娜 Li Yingna, 谢涛 Xie Tao, 李川 Li Chuan
Anchor cable usually works in high tensile stress state,the security and stability of slope are related to the health of anchor cable.In order to reflect the real-time tensile stress state of the anchor cable,the optical fiber Bragg grating is installed on the surface of a single wire of the anchor cable.The anchor cable will deform under the action of forces,which makes the center wavelength of the optical fiber Bragg grating shift.Tensile stress test shows that the tensile stress sensitivity is 19.9pm/kN,the linearity is 1.02%FS.The tensile stress which is applied in the anchor cable can be online monitoring by measuring the center wavelength of the optical fiber Bragg grating.
锚索通常在高拉应力状态下工作,边坡的安全稳定关系到锚索的健康与否。为了实时反映锚索的拉应力状态,将光纤布拉格光栅安装在锚索单根导线的表面。锚索在力的作用下会发生变形,使光纤布拉格光栅的中心波长发生位移。拉伸应力试验结果表明,拉伸应力敏感性为19.9pm/kN,线性度为1.02%FS。通过测量光纤光栅的中心波长,可以在线监测锚索所受的拉应力。
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引用次数: 0
Design and numerical studies of composite defect photonic crystal optical filter 复合缺陷光子晶体滤光片的设计与数值研究
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144002.0172
陈. C. Ying, 刘腾 Liu Teng, 卢波 Lu Bo, 范卉青 Fan Huiqing
To eliminate the multimode property of the photonic crystal ring cavity filter,a composite defect photonic crystal filter structure combined point defect with ring cavity is proposed,in which the line defect is taken as the main waveguide and the load waveguide combining the point defect with the ring cavity is adopted to achieve the filtering for the certain wavelength.By changing the refractive index of the rods in the general photonic crystal structure,the refractive index of the point defect or the size of the point defect,the influences on the filtering property is analyzed.Mis regarded as m=r-point/r,the numerical simulation result shows that the filtering wavelength will remain the same the filtering characteristic when mis varied from 0to 0.6,while mis in the reasonable range from 0.6to 1.8,the single longitudinal mode filtering characteristic and its tunability can be achieved by changing the point defect radius,which can make the effective theoretical reference for the design of multi-channel filter.
为了消除光子晶体环形腔滤波器的多模特性,提出了一种点缺陷与环形腔相结合的复合缺陷光子晶体滤波器结构,该结构以线缺陷为主波导,采用点缺陷与环形腔相结合的负载波导实现对特定波长的滤波。通过改变一般光子晶体结构中棒的折射率、点缺陷的折射率或点缺陷的尺寸,分析了对滤光性能的影响。将Mis设为m=r-点/r,数值模拟结果表明,当Mis在0 ~ 0.6范围内变化时,滤波波长保持不变的滤波特性,而Mis在0.6 ~ 1.8的合理范围内,通过改变点缺陷半径可以实现单纵模滤波特性及其可调性,为多通道滤波器的设计提供了有效的理论参考。
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引用次数: 0
Low-concentration detection of benzene using laser Raman spectroscopy 激光拉曼光谱法检测低浓度苯
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144003.0195
马. M. Jing, 黄蓉 Huang Rong
Laser Raman spectroscopy technique based on Raman scattering theory has the advantages of rapid,nondestructive,and without sample pretreatment.25samples of benzene with different concentrations are studied by using laser Raman spectroscopy technique.The results show that in the 184.8g/L~0.264g/L concentration range,the linear relationship between the intensity of Raman lines of benzene and its concentration.The linear correlation coefficient of R=0. 99626is obtained by using the least square method.The detection limit is 0.223g/L.
基于拉曼散射理论的激光拉曼光谱技术具有快速、无损、无需样品预处理等优点。用激光拉曼光谱技术对25个不同浓度苯样品进行了研究。结果表明:在184.8g/L~0.264g/L浓度范围内,苯的拉曼谱线强度与浓度呈线性关系;线性相关系数R=0。99626是用最小二乘法得到的。检出限为0.223g/L。
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引用次数: 1
A new method of making real-color rainbow hologram with wide viewing angle 一种制作宽视角真彩色彩虹全息图的新方法
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144003.0205
甘亮勤 Gan Liangqin, 曾胜财 Zeng Shengcai, 杨上供 Yang Shanggong
In order to improve the color effect and the visual angle of hologram,based on the method of mirror images,a new technique is proposed to obtain a real color hologram with a large viewing angle by the combination of computer-generated hologram and optical hologram.There are two steps to realize the method:Firstly,computer-generated hologram H1r,H1g,H1bis yielded with three image objects.Secondly,a rainbow hologram H2is generated by optical ways.In terms of the reversibility of light path principle,an image with a wide viewing angle is reconstructed by reversing the reconstructed wave.The technique achieves a color reconstruction image with a wide viewing angle of 14°.The color effect and the stereoscopic effect of the reconstruction image is increased.
为了提高全息图的色彩效果和视角,在镜像方法的基础上,提出了将计算机生成的全息图与光学全息图相结合,获得大视角的真实彩色全息图的新技术。该方法的实现分为两步:首先,用三个像标的生成计算机生成的全息图H1r,H1g,H1bis。其次,利用光学方法生成彩虹全息图h2s。根据光路可逆性原理,通过对重构波进行反转,重构出具有宽视角的像。该技术实现了14°宽视角的彩色重建图像。增强了重建图像的色彩效果和立体感。
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引用次数: 0
Optimization of reconstructed images of 3-D phase hologram based on phase-only spatial light modulator 基于纯相位空间光调制器的三维相位全息图重构图像优化
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144003.0230
梁浩聪 Liang Hao-cong, 蒋晓瑜 Jiang Xiaoyu, 牛树来 Niu Shulai, 闫兴鹏 Yan Xingpeng, 赵. Z. Kai
Based on the existed ways of 2-D reconstructed images by spatial light modulator(SLM),the methods to enhance the reconstructed quality of 3-D images are investigated.Based on the diffraction theory,the effects of a lattice SLM with a limited fill factor on the reconstructed images are analyzed.The effective light is moved away from the center optical axis by coding the double linear phases into the phase-only hologram,so the details of the original patterns can be reconstructed completely.The two focused planes of reconstructed images and the multi-order beams caused by the lattice structure of the SLM can be separated spatially,through adding the phases of doubleconvergent spherical wave.The spatial filter is used to eliminate the influences of higher-orders diffraction beams and zero-order light of reconstructed images,respectively.A holographic optoelectronic display system based on liquid crystal spatial light modulator(LC-SLM) is set up to demonstrate this method.
在现有空间光调制器二维图像重建方法的基础上,研究了提高三维图像重建质量的方法。基于衍射理论,分析了有限填充因子的点阵SLM对重建像的影响。通过将双线性相位编码到纯相位全息图中,使有效光远离中心光轴,从而可以完全重建原始图案的细节。通过添加双会聚球面波的相位,可以在空间上分离重构像的两个聚焦面和由SLM晶格结构引起的多阶光束。利用空间滤波器分别消除重构图像中高阶衍射光束和零阶光的影响。为此,设计了基于液晶空间光调制器(LC-SLM)的全息光电显示系统。
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引用次数: 0
Research on transmission power spectrum of tilted fiber Bragg grating temperature sensing 倾斜光纤光栅温度传感的传输功率谱研究
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0327
高宇飞 Gao Yufei, 刘. L. Chao, 张. Z. Yong
Based on mode coupling theory,tilted fiber Bragg grating temperature sensing principle and the characteristics of transmission spectrum of fundamental modes and high-modes are proposed.The temperature shift of fundamental modes resonance wavelength and high-order modes resonance wavelength is investigated by means of simulation method.The tilted angle on the effect of resonance wavelength is discussed.The results show that the different resonance wavelengths are linealy increased with surrounding temperature.The center wavelength of transmission spectrum is non-drift with the increase of tilted angle,and the width of transmission spectrum decreases with the increase of tilted angle.The result has a certain guiding function to the application of the tilted fiber Bragg grating.
基于模式耦合理论,提出了倾斜光纤布拉格光栅的感温原理及基模和高模的透射光谱特性。采用仿真方法研究了基模共振波长和高阶模共振波长的温度变化。讨论了倾斜角度对共振波长的影响。结果表明,不同的共振波长随周围温度呈线性增加。随着倾斜角度的增大,透射光谱的中心波长不漂移,透射光谱的宽度随着倾斜角度的增大而减小。研究结果对倾斜光纤布拉格光栅的应用具有一定的指导作用。
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引用次数: 3
Optical characteristics analysis of grating light valve and application in thermal CTP system 光栅光阀光学特性分析及其在热敏CTP系统中的应用
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0371
缪斌鹰 Miao Binying, 唐正宁 Tang Zhengning
The grating light valve(GLV)is a diffractive MOEMS spatial light modulator,and it has been successfully applied in the computer-to-plate(CTP)system by modulating laser beams.A simplified grating light valve optical model is put forward,and the optical characteristics of GLV is analyzed according to Fraunhofer single-slit diffraction theory and multiple beam interference theory.The application of grating light valve in thermal CTP system is described,and the structure and imaging principle of GLV optical write engine are analyzed.The digital imaging process of the GLV-based thermal CTP system is concluded,which provides the theory basis for the domestic printing enterprise to use the thermal imaging technology.
光栅光阀(GLV)是一种衍射MOEMS空间光调制器,通过调制激光束已成功应用于计算机到光板(CTP)系统。提出了一种简化的光栅光阀光学模型,并根据弗劳恩霍夫单缝衍射理论和多光束干涉理论分析了光栅光阀的光学特性。介绍了光栅光阀在热CTP系统中的应用,分析了GLV光写入引擎的结构和成像原理。总结了基于glv的热CTP系统的数字成像过程,为国内印刷企业使用热成像技术提供了理论依据。
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引用次数: 0
Analysis of flow field characteristics in fluid jet polishing 射流抛光流场特性分析
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0376
罗银川 Luo Yinchuan, 李秀龙 Li Xiulong, 张. Z. Yang, 张蓉竹 Zhang Rongzhu, 杨李茗 Yang Liming
By analyzing the flow field characteristics of impinging jet,mathematical relationship between the impact angle,stand-off distance,jet velocity and the pressure,velocity on wall is established.The influence of different parameters on fluid jet distribution is analyzed by quantitative calculate,the results indicate that the pressure and velocity on wall with the outlet pressure,velocity is linearly proportional.When the impact distance is greater than 9.6times of the diameter of nozzle,the pressure and velocity on wall decrease with the increasing of stand-off distance.The peak pressure reduces to 0.54times of the pressure of spout when the impact distance increases to 15times of the diameter of nozzle.And they decrease with the decreasing of impact angle.When impact angles are 90°,60°,45°,ps=0.95p0,0.74p0,0.475p0,and um02=0.96u0,0.8u0,0.67u0are got respectively.
通过对冲击射流流场特性的分析,建立了冲击角、间隙距离、射流速度与壁面压力、速度之间的数学关系。通过定量计算分析了不同参数对射流分布的影响,结果表明,壁面压力、速度与出口压力、速度成线性正比关系。当冲击距离大于喷管直径的9.6倍时,壁面压力和速度随冲击距离的增加而减小。当冲击距离增加到喷嘴直径的15倍时,峰值压力降至喷嘴压力的0.54倍。并且随着冲击角的减小而减小。当碰撞角度为90°、60°、45°时,分别得到ps=0.95p0、0.74p0、0.475p0, um02= 0.960 u0、0.8u0、0.67u0。
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引用次数: 3
An edge detection method based on the Sobel and K-means 基于Sobel和K-means的边缘检测方法
Q4 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144005.0394
杨. Y. Kun, 张明鑫 Zhang Mingxin, 先晓兵 Xian Xiaobing, 郑金龙 Zheng Jinlong, 聂盼红 Nie Panhong
The result of the image processed by traditional edge detection operator is an edge sharpening gradient image.In order to get the binary edge image,it requires determining the threshold artificially.The loss of edge information is caused.So it uses the Sobel operator with increase convolution mask to get the gradient image.The threshold value through the steps K-means algorithm based on gradient histogram is got,the binary edge image is obtained by segmenting gradient image which uses the acquired threshold value,the edge is thinned and connected.The Otsu algorithm is used to check the correctness ofthreshold value and different edge detection approaches are compared with improved method.It obtains reasonable threshold value and has a better performance than improved Sobel operator and the result is close to Canny operator with optimal threshold.It can be applied in the field of machine vision.
传统的边缘检测算子对图像进行处理后得到的是边缘锐化梯度图像。为了得到二值边缘图像,需要人为地确定阈值。导致边缘信息丢失。因此,采用带增加卷积掩模的Sobel算子得到梯度图像。通过基于梯度直方图的步长k均值算法得到阈值,利用获得的阈值对梯度图像进行分割得到二值边缘图像,对边缘进行薄化连接。采用Otsu算法检验阈值的正确性,并对不同边缘检测方法进行了比较。该方法获得了合理的阈值,比改进的Sobel算子具有更好的性能,其结果接近具有最优阈值的Canny算子。它可以应用于机器视觉领域。
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引用次数: 1
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