基于视频序列的图像拼接

为消除视频序列之间的冗余信息,以简单的摘要形式表达视频的主要内容,提出了一种基于视频序列的图像拼接方法。首先,采用改进的帧间聚类算法提取视频的关键帧;其次,利用SIFT算法提取关键帧的特征点,采用最近邻算法进行特征点匹配,通过引导互匹配法和投票过滤法提高匹配精度;再次通过RANSAC鲁棒估计算法得到所选帧间的单映矩阵,并使用LM非线性迭代算法对单映矩阵进行精炼。最后,利用级联单映矩阵结合加权融合算法实现了视频序列的无缝拼接,实验效果较为理想。     

一种基于自适应关键帧的视频序列拼接方法

由于视频帧数量较大,视频序列拼接时容易造成拼接误差大、耗时较多,为有效解决此问题,提出一种基于自适应关键帧的视频序列拼接方法。将固定间隔采样帧作为关键帧并对其进行特征点提取,利用特征点匹配结合RANSAC鲁棒估计算法得到关键帧间单映矩阵,依此计算关键帧间重叠区域,按照重叠区域比例结合折半排序方法重新定位关键帧,将此关键帧作为基准帧,重复帧采样、重叠区域确定、定位后续所需关键帧过程,直至关键帧提取完毕,最后,利用级联单映矩阵和加权融合实现视频序列无缝拼接。实验验证了该方法的有效性。     

基于SURF和改进RANSAC的视频拼接算法

在传统的视频拼接算法中,配准的误差和运动的物体都会使拼接结果产生鬼影,而复杂的融合算法又难以满足实时性要求。针对上述问题,以平行光轴且光心位于同一水平基线位置的双目相机采集的视频图像为研究对象,提出一种基于限定区域和SURF算法的视频拼接方法。针对采集到的具有20%~30%重叠感兴趣区域(ROI)的视频图像,每24帧设置一个关键帧,仅对关键帧的ROI区域采用SURF算法寻找特征匹配点对。然后采用改进的RANSAC算法筛选单应性变换矩阵H,对非关键帧直接采用此单应性变换矩阵H进行图像融合。实验结果表明,采用关键帧计算特征点的方式得到的视频拼接效果能够很好地消除鬼影,同时也能够保证视频融合的实时性。     

一种多摄像机全景视频图像快速拼接算法

针对多摄像机全景成像系统在近距离观测时全景图像存在视差失真和拼接费时的问题,提出了一种自适应调整相邻图像间变换矩阵的快速拼接算法。算法根据相邻图像重叠区域的匹配程度,采用快速自适应优化调整算法确定最佳变换矩阵参数,从而实现全景视频图像的无缝拼接。实验结果表明:本文提出的算法可以快速实现多摄像机全景视频图像的光滑拼接,满足近距离全景视频观测的实际要求。     

分布视频编码中基于帧间相关性的自适应关键帧选取算法

针对分布式视频编码(DVC)系统中固定周期关键帧选取(PKFS)方法忽视了帧间相关性的缺陷,提出了一种自适应关键帧选取(AKFS)算法。利用图像特征点检测与匹配的方法,将相邻图像的非匹配点作为帧间相关性的近似,把累积或平均非匹配点数超过阈值的帧判定为关键帧。在此基础上,提出改进的帧内插方案,以适应不同长度序列组的边信息生成;将零运动强度的关联帧合并为一帧图像参与编解码,进一步提高了系统的压缩效率。实验结果表明,对于不同运动特性的序列,本文提出的算法可以明显提升边信息帧的重建质量,使系统的率失真性能提高0.9～2.0 dB,并有效降低了编码传输码率。     

改进模型估计的无人机侦察视频快速拼接方法

针对提高无人机侦察视频的拼接速度与效果的问题,提出一种改进模型估计的无人机侦察视频快速拼接方法。首先,基于自适应鲁棒性尺度不变的特征检测子对视频各帧进行基于点的特征匹配。其次,提出改进的随机抽样一致性算法进行模型估计,并去除误匹配点。最后,提出侦察影像快速拼接算法,计算各影像变换到正射拼接图的单应性矩阵,完成视频序列拼接。实验结果表明:改进的随机抽样一致性算法在保证鲁棒性的同时,提高了执行速度;侦察影像快速拼接算法提高了拼接速度,同时改善了拼接效果。     

一种新的无人机航拍序列图像快速拼接方法

 无人驾驶飞机航拍序列图像的邻近帧间含有大量的相交区域,这些相交区域是进行基于特征的图像拼接的基础,但是也成为了降低拼接效率的冗余信息.因此,本文提出一种既稳定又具有较小时间开销的无人机航拍序列图像的自动拼接方法.利用图像拼接过程中查找到的匹配特征点,自适应提取出适于航拍序列图像快速拼接的关键帧;在分析了序列图像的拼接时的相交区域的运动模型的基础上,建立了无人机航拍序列图像配准过程中的特征搜索区域预测的卡尔曼滤波器,减少了特征搜索和配准的时间;然后给出了详细无人机航拍序列图像的快速拼接方法,实验结果显示,本文的方法具有较好的拼接效果和拼接效率.     

Video Copy Detection Method Based on Color and Texture Features of Key Frames

提出了一种基于关键帧颜色和纹理特征的视频拷贝检测方法.首先通过子片段方法提取视频的关键帧,然后将关键帧分成3个子块,提取每个子块的三维量化颜色直方图,通过直方图相交法来进行颜色特征的匹配.对检索得到的结果视频关键帧进行纹理特征提取,通过其灰度共生矩阵的角二阶矩和熵来表征其纹理特征,纹理特征的匹配可进一步过滤不相关的视频.实验结果表明,该方法效果好、稳健性强且可应用于多种类型的视频.     

基于关键帧颜色和纹理特征的视频拷贝检测

提出了一种基于关键帧颜色和纹理特征的视频拷贝检测方法。首先通过子片段方法提取视频的关键帧,然后将关键帧分成3个子块,提取每个子块的三维量化颜色直方图,通过直方图相交法来进行颜色特征的匹配。对检索得到的结果视频关键帧进行纹理特征提取,通过其灰度共生矩阵的角二阶矩和熵来表征其纹理特征,纹理特征的匹配可进一步过滤不相关的视频。实验结果表明,该方法效果好、稳健性强且可应用于多种类型的视频。     

基于误差阈值和最小二乘图像拼接关系矩阵的实现

为了获得图像最佳拼接效果,对相邻图像间变换矩阵的求解问题进行研究,提出了一种全稳健的图像拼接算法.此算法采用SIFT进行特征点提取,初步得到了特征点匹配的伪匹配集合,并运用稳健的误差阈值法将伪匹配点集合划分为内点和外点,在内点域上运用误差的最小二乘优化算法精确地估计出了图像间的点变换关系,最后采用颜色插值对交接处进行颜...     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.