The parallel processor for the character extraction of digitizing image

ＴｈｅｐａｒａｌｌｅｌｐｒｏｃｅｓｓｏｒｆｏｒｔｈｅｃｈａｒａｃｔｅｒｅｘｔｒａｃｔｉｏｎｏｆｄｉｇｉｔｉｚｉｎｇｉｍａｇｅＨＵＡＮＧＧｕｏｌｉａｎｇ；ＷＵＭｉｎｘｉａｎ；ＪＩＮＧｕｏｆａｎ；ＹＡＯＺｈｏｎｇｂｉｎｇ；ＹＡＮＹｉｎｇｂａｉ（Ｄｅｐｔ．...     

Influence of Buffer-Layer Thickness on Performance of Waveguide Modulators

ＩｎｆｌｕｅｎｃｅｏｆＢｕｆｆｅｒ－ＬａｙｅｒＴｈｉｃｋｎｅｓｓｏｎＰｅｒｆｏｒｍａｎｃｅｏｆＷａｖｅｇｕｉｄｅＭｏｄｕｌａｔｏｒｓ￥ＸＡＩＮＧＹｕｎｎａｎ；ＷＡＮＧＫｕｉｒｕ；ＹＵＧｕｏｘｉａｎ；ＸＵＤａｘｉｏｎｇ（ＢｅｉｊｉｎｇＵｎｖｅｒｓｉｔｙ...     

Electron impact ionization cross sections for Li-like Al ion in ground and excited states

ＥｌｅｃｔｒｏｎｉｍｐａｃｔｉｏｎｉｚａｔｉｏｎｃｒｏｓｓｓｅｃｔｉｏｎｓｆｏｒＬｉ－ｌｉｋｅＡｌｉｏｎｉｎｇｒｏｕｎｄａｎｄｅｘｃｉｔｅｄｓｔａｔｅｓＨＵＷｅｉ；ＷＡＮＧＹａｎｓｅｎ；ＦＡＮＧＤｕｆｅｉ；ＬＵＦｕｑｕａｎ；ＴＡＮＧＪｉａｙｏｎｇ；Ｙ...     

High Performance AlGaAs Quantum Well Lasers with Low Beam Divergence Grown by Molecular Beam Epitaxy

ＨｉｇｈＰｅｒｆｏｒｍａｎｃｅＡｌＧａＡｓＱｕａｎｔｕｍＷｅｌｌＬａｓｅｒｓｗｉｔｈＬｏｗＢｅａｍＤｉｖｅｒｇｅｎｃｅＧｒｏｗｎｂｙＭｏｌｅｃｕｌａｒＢｅａｍＥｐｉｔａｘｙ￥ＹＡＮＧＧｕｏｗｅｎ；ＸＩＡＯＪｉａｎｗｅｉ；ＸＵＺｕｎｔｕ；ＸＵＪｕｎｙｉ...     

Theoretical Model of Bidirectional Signal Propagation in Distributed EDFAs

ＴｈｅｏｒｅｔｉｃａｌＭｏｄｅｌｏｆＢｉｄｉｒｅｃｔｉｏｎａｌＳｉｇｎａｌＰｒｏｐａｇａｔｉｏｎｉｎＤｉｓｔｒｉｂｕｔｅｄＥＤＦＡｓ￥ＰＡＮＧＹｏｎｇ；ＪＩＡＮＧＰｅｉｘｕａｎ；ＸＵＤａｘｉｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＲａｄｉｏｅｎｇｉｎｅｅｒｉ...     

Studies of imaging experiment for photon scanning tunneling microscopy

ＳｔｕｄｉｅｓｏｆｉｍａｇｉｎｇｅｘｐｅｒｉｍｅｎｔｆｏｒｐｈｏｔｏｎｓｃａｎｎｉｎｇｔｕｎｎｅｌｉｎｇｍｉｃｒｏｓｃｏｐｙＧＵＯＮｉｎｇ；ＷＵＳｈｉｆａ；ＸＩＡＤｅｋｕａｎ；ＣＨＵＳｈｉｃａｏ（ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇ...     

A Quenched Dye Laser Pumped by a KrF Excimer Laser

ＡＱｕｅｎｃｈｅｄＤｙｅＬａｓｅｒＰｕｍｐｅｄｂｙａＫｒＦＥｘｃｉｍｅｒＬａｓｅｒ￥ＸＵＥＳｈａｏｌｉｎ；ＬＯＵＱｉｈｏｎｇ；ＨＵＡＮＧＨｕｉｊｉｅ；ＤＵＬｏｎｇｌｏｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉ...     

A High Efficient Stable Intracavity Doubling Nd：YAG Laser Pumped by a Laser Diode

ＡＨｉｇｈＥｆｆｉｃｉｅｎｔＳｔａｂｌｅＩｎｔｒａｃａｖｉｔｙＤｏｕｂｌｉｎｇＮｄ：ＹＡＧＬａｓｅｒＰｕｍｐｅｄｂｙａＬａｓｅｒＤｉｏｄｅ￥ＺＨＡＮＧＫｕａｎｓｈｏｕ；ＸＩＥＣｈａｎｇｄｅ；ＧＵＯＲｉｎｇｘｉａｎｇ；ＰＥＮＧＫｕｎｃｈｉ（Ｉｎｓｔｉｔ...     

Nonlinear Distortion Analyses in IM-DD SCM Lightwave Systems

ＮｏｎｌｉｎｅａｒＤｉｓｔｏｒｔｉｏｎＡｎａｌｙｓｅｓｉｎＩＭ－ＤＤＳＣＭＬｉｇｈｔｗａｖｅＳｙｓｔｅｍｓ￥ＳＯＮＧＨａｉｙａｎ；ＧＵＷａｎｙｉ；ＬＩＧｕｏｒｕｉ；ＸＵＤａｘｉｏｎｇ（ＤｅｐｔｏｆＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎＥｎｇ．Ｂｅｉｊｉｎ...     

Diode-Pumped Monolithic Nd:LMA Laser

Ｄｉｏｄｅ－ＰｕｍｐｅｄＭｏｎｏｌｉｔｈｉｃＮｄ：ＬＭＡＬａｓｅｒ￥ＬＵＪｉａｎｇ；ＨＵＡＮＧＺｈａｏｍｉｎｇ；ＪＩＮＺｈｅｎｈｏｎｇ；ＷＡＮＧＹａｎｇｊｕｎ（ＯｐｔｉｃａｌＦｉｂｅｒＩｎｓｔｉｔｕｔｅ，，ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＳｃ...     

A Optical Scheme for Parallelly Realizing the Morphological Erosion of 1－D Gray Images

Ａ　Ｏｐｔｉｃａｌ　Ｓｃｈｅｍｅ　ｆｏｒ　Ｐａｒａｌｌｅｌｌｙ　Ｒｅａｌｉｚｉｎｇ　ｔｈｅ　Ｍｏｒｐｈｏｌｏｇｉｃａｌ　Ｅｒｏｓｉｏｎ　ｏｆ　１－Ｄ　Ｇｒａｙ　ＩｍａｇｅｓＡＯｐｔｉｃａｌＳｃｈｅｍｅｆｏｒＰａｒａｌｌｅｌｌｙＲｅａｌｉｚｉｎｇｔｈｅ...     

一种新颖的基于截集分解的形态学算子

数学形态学算子在机器视觉应用领域中 ,如目标识别、图像分割及缺陷探测中越来越引起人们的重视。二值形态学基本操作膨胀与腐蚀也已经扩展到灰值图像处理中。目前已存在有几种不同的灰值形态学算子的定义 ,但对于结构元为灰值图的灰值图像处理 ,还未有一种具有实时处理结构的形态学算子。文中给出了这样的一种灰值形态学算子的定义。为了进一步增强这种算子的处理能力 ,在模糊集构成的完备格框架下完成了这种算子的构造过程。     

基于二维直方图和模糊熵准则的阈值化方法

图像分割是图像分析、识别和理解的基础。图像分割主要是指将图像分成各具特性的区域并提取出感兴趣目标的技术,其研究多年来一直受到人们的高度重视;阈值化法是图像分割的一种重要方法,在图像处理与识别中广为应用;针对图像分割中细节往往被忽略导致后续处理困难的问题,基于模糊关系和最大模糊熵原理提出了一种阈值化方法,对二维直方图进行模糊分割;为了获得图像分割中的细节,提出的方法根据最大熵原则自动确定模糊区域和门限,进而获得二维模糊熵和遗传算法最优解,最后获得图像细节;通过对不同灰度水平和颜色类型图像进行实验比较,实验结果表明提出的方法优于二维非模糊方法和一维模糊熵分割法,得到该方法在图像分割中获得细节的结论。     

基于蚁群算法的二维最大熵分割算法

由于二维最大熵分割法不仅考虑了像素的灰度信息,而且还充分利用了像素的空间邻域信息,因此能够取得较好的分割效果.但是,该方法的计算量巨大,不利于红外图像的快速处理.蚁群算法于20世纪90年代初提出,是受到蚁群集体行为的启发而提出的一种基于种群的模拟进化算法,属于随机搜索算法.该算法已经成功应用于旅行商等离散问题.将蚁群算法应用于二维最大熵法,提出了基于蚁群算法的二维最大熵分割算法.与传统的穷尽搜索法相比,求解速度提高了60倍左右.仿真实验表明,该方法快速、简单、有效.     

One-operation image algebra for optical processing

A binary image algebra with one operation of a logic operation followed by a dilation and its modification with three additional operations for threshold processing of grey level images are developed in this paper. All the binary image processing functions and various grey level image processing functions related to morphological operations can be represented by the algebraic structure. The algebra is particularly suitable for parallel processing by optics in a cellular logic image processor architecture.     

Optical greyscale morphological transformations

Greyscale morphology is more efficient and useful for processing greyscale image. It is the extension of binary morphology by use of a min or max operations. Optics is suitable for the implementation of morphological transformations because of its parallelism. However, greyscale morphology with both greyscale images and greyscale structuring elements is difficult to realize threshold decomposition since it does not commute with threshold. We propose a correlation approach for greyscale morphological transformations using area-coding technique to represent the umbra of surfaces of both greyscale image and greyscale structuring element. A primary experiment of greyscale dilation is presented.     

二维直方图θ划分最大Shannon熵图像阈值分割

鉴于常用二维直方图区域直分法存在错分,最近提出的斜分法不具普遍性,提出了适用面更广的基于二维直方图θ划分和最大Shannon熵的图像阈值分割算法.首先给出了二维直方图θ划分方法,采用四条平行斜线及一条其法线与灰度级轴成θ角的直线划分二维直方图区域,按灰度级和邻域平均灰度级的加权和进行阈值分割,斜分法可视为该方法中θ=45°的特例;然后导出了二维直方图θ-划分最大Shannon熵阈值选取公式及其快速递推算法;最后给出了θ取不同值时的分割结果及运行时间,θ取较小值时,边界形状准确性较高,θ取较大值时,抗噪性较强,应用时可根据实际图像特点及需求合理选取θ的值.与常规二维直方图直分最大Shannon熵法相比,本文提出的方法所得分割结果更为准确,抵抗噪声更为稳健,且所需运行时间及存储空间也大为减小.     

Nonlinear display of NMR T1 and T2 images taking into account precision and visual perception

This study deals with a two-step modification of the linear gray scales for the display of calculated T1 and T2 images. The first step, isoprecision display, links up the gray scales for T1 and T2 images and the estimated precisions of these parameters. For arbitrary experimental setups isoprecision gray scales can be calculated and implemented using table-lookup techniques. In the special case of a minimal dataset ratio images turn out to provide good approximations for isoprecision gray scales. The second step adapts the gray scales to the response of the human visual system by applying Weber's law.     

4-D image reconstruction for Streak Tube Imaging Lidar

The Streak Tube Imaging Lidar (STIL) which is the flash laser radar is developed in recently years. It can output the 4-D image (3-D range image + 1-D intensity image). The core part of STIL is the streak tube, which is a line array detector. STIL can directly collect the image of returned light pulse, and consequently, it can’t output the 4-D target image. In the paper, the peak detection as the reconstruction algorithm is used to reconstruct the multiple streak tube images, and the clear 4-D target images are obtained. The outdoor imaging experiments are completed for the far distance buildings. The reconstruction for the multiple streak tube images is finished, and the results state that the peak detection algorithm can output the high-resolution 4-D target images. Original Text ? Astro, Ltd., 2009. The article is published in the original.     

改进形态学相关算法以识别高相似度灰度图像

从形态学角度定义了灰度联合图像相似度，提出两种基于位表示法形态学相关算法的改进算法，通过提取位表示法的图像片边缘特征或二元化位表示法的图像片功率谱，以提高位表示法形态学相关算法对高相似度灰度图像的识别能力。