论文部分内容阅读
激光与光电子学进展1975年第12卷第06期 目录
【出 处】
：
激光与光电子学进展
【发表日期】
：
1975年12期
其他文献
将激光焊接头与CCD视频跟踪模块集成在一起,提出一种采用一字线激光进行自动化焊缝检测的方法。该方法利用激光三角测量法,得到焊缝的高度、宽度等形状信息。在图像处理方面,对所获得的焊缝区域图像进行中值滤波和二值化处理,获得焊缝特征点二维坐标,实现目标定位,并计算其在世界坐标系下的三维坐标。在跟踪算法方面,采用精度高、速度快的核相关滤波器目标跟踪算法,分别对常见的直线型和曲线型焊缝位置进行跟踪。实验所得
根据图像的几何结构特性,从人类视觉系统特性出发,建立了Gabor感知多成份字典,进而模拟人类视觉通路的层次处理机制,构建了稀疏编码网络,能够有效去除图像中的高阶冗余,形成更为稀疏的表示。对稀疏表示系数重组后进行比特平面量化,实现了低比特率的可伸缩编码。实验结果表明,在低比特率下,本文算法压缩后重构图像的感知质量要明显优于JPEG2000,峰值信噪比也与其相当,并且对于图像中的边缘和纹理等细节保持效果更佳。
基于部分相干理论中交叉谱密度函数的概念研究了平面周期物体的Lan效应文章导出了平面物体Lau像光强分布式,求得了平面周期物体的Lau像光强分布及其Lau成像条件,并进行了实验验证,给出了实验结果.
Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Las
An experimental and simulation study of warm dense carbon foams at ambient density (ne ～ 1021 cm-3) is presented. This study of isochorically heated foams is motivated by their potential application in carbon
期刊
We report a 307 W 1018 nm Yb-doped fiber laser pumped by a single 976 nm laser diode. The cavity slope efficiency is up to 75.9% and the amplified spontaneous emission is suppressed by 54 dB. The beam quality of the output laser has an
Objective image quality measure, which is a fundamental and challenging job in image processing, evaluates the image quality consistently with human perception automatically. On the assumption that any image distortion could be modeled as the difference b
Optical detectors with single-photon sensitivity and large dynamic range would facilitate a variety of applications. Specifically, the capability of extending operation wavelengths into the mid-infrared region is highly attractive. Here we implement a mid
期刊
KrF excimer laser-fabricated Bragg grating in optical microfiber made from pre-etched conventional p
A method to fabricate fiber Bragg grating (FBG) in an optical microfiber (OM) from a conventional photosensitive fiber is proposed in this letter. The cladding of a conventional photosensitive fiber is etched to 17 \mu m. The etched fiber is drawn to an
Surface-plasmon (SP) enhancement of amorphous-silicon-nitride (a-SiNx) light emission with single-layer gold (Au) waveguides is experimentally demonstrated through time-resolved photoluminescence measurement. The a-SiNx active layer with strong steady-sta