中巴资源卫星HR与CCD图像融合方法探讨

中巴资源卫星（CBERS）多光谱CCD数据与全色HR数据空间分辨率相差较大,给图像融合带来一定困难。利用锐化、高通滤波（HPF）、Brovey变换、IHS变换、主成分变换、GS变换和小波变换等方法对CCD与HR数据进行融合试验。通过定性与定量分析,探讨了不同方法的融合效果。     

IMU/DGPS辅助车载CCD及激光扫描仪三维数据采集与建模

三维信息快速采集是真实场景建模与三维虚拟现实技术的关键。本文提出了一种基于激光扫描仪、线/面阵CCD相机及GPS与IMU等多种传感器融合的车载移动式数据快速采集系统。各传感器安置在车内稳定平台上并随车保持一致的运动姿态。通过对GPS和IMU数据进行卡尔曼(Kalman)滤波,可推测出整个系统及各传感器的位置和最佳姿态估计;从扫描仪点云数据可提取出街道场景中事物的三维几何信息;线阵CCD相机用于获取路面带状地物等线性特征;面阵CCD采集街道两侧面状纹理信息,从而快速获得城市目标的地理坐标和三维建模信息,由此可重建城市路面街道的三维真实场景。     

CCD photometry of RV rau stars. VII. EP lyrae

Photometric observations of the variable star EP Lyr were performed with a CCD photometer during the observing season of 2002. Analysis of these observations together with published data has confirmed the mean period of the main variability cycle P = 83.^d248 over almost 100 years. The periodicity of the variations in the main cycle is investigated on the basis of O-C diagrams. The time scale of its variations ranges from 1–2 to 8–20 thousand days.     

Argos: An optimized time-series photometer

We designed a prime focus CCD photometer, Argos, optimized for high speed time-series measurements of blue variables (Nather & Mukadam 2004) for the 2.1 m telescope at McDonald Observatory. Lack of any intervening optics between the primary mirror and the CCD makes the instrument highly efficient. We measure an improvement in sensitivity by a factor of nine over the 3-channel PMT photometers used on the same telescope and for the same exposure time. The CCD frame transfer operation triggered by GPS synchronized pulses serves as an electronic shutter for the photometer. This minimizes the dead time between exposures, but more importantly, allows a precise control of the start and duration of the exposure. We expect the uncertainty in our timing to be less than 100μs. Hubble Fellow     

CMOS Detector Technology

An entry level overview of state-of-the-art CMOS detector technology is presented. Operating principles and system architecture are explained in comparison to the well-established CCD technology, followed by a discussion of important benefits of modern CMOS-based detector arrays. A number of unique CMOS features including different shutter modes and scanning concepts are described. In addition, sub-field stitching is presented as a technique for producing very large imagers. After a brief introduction to the concept of monolithic CMOS sensors, hybrid detectors technology is introduced. A comparison of noise reduction methods for CMOS hybrids is presented. The final sections review CMOS fabrication processes for monolithic and vertically integrated image sensors.     

散射光对准确CCD平场的影响--修改某些反光镜挡光筒的必要性

继前文之后，进一步说明，晨昏蒙影平场与夜天露光的差别主要由于存在散射光．像Grundahl和Sorensen那样，上海天文台1．56米和南京大学63厘米反光镜的针孔像也已获得，直观地显示了散射光的存在，1．56米和63厘米反光镜都有标准设计的挡光筒，所有标准设计的反光镜都只有两个挡光筒，分别置于主镜和付镜前面．为了在得出准确平场时CCD不受散射光影响，这样的挡光筒是不够的．这是所有标准设计的档光筒共同的弱点．为了得到更准确的平场改正，修改所有类似的反光镜主镜挡光筒是极其重要的。     

Preformance evaluation of several fusion approaches for CCD/SAR images

Several image fusion approaches for CCD/SAR images are studied and the performance evaluation of these fusion approaches is completed in this paper. Firstly, the preprocessing of CCD/SAR images before fusion is fulfilled. Then, the image fusion methods including linear superposition, nonlinear operator method and multiresolution methods, of which the multiresolution methods include Laplacian pyramid, ratio pyramid, contrast pyramid, gradient pyramid, morphological pyramid and discrete wavelet transform, are adopted to fuse two types of images. Lastly, the four performance measures, standard deviation, entropy, cross entropy and spatial frequency, are calculated to compare the fusion results by different fusion approaches in this paper. Experimental results show that contrast pyramid, morphology pyramid and discrete wavelet transformation in multiresolution approaches are more suitable for CCD/SAR image fusion than other ones proposed in this paper and the objective performance evalution of CCD/SAR image fusion approaches are effective. Foundation item: Under the auspices of Astronautical Innovation Fund of China. Biography: WANG Yan-li (1977 – ), female, a native of Xi’an City, Shaanxi Province, Ph. D. candidate of School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, specialized in scene matching, image registration and fusion.     

一种基于CCD的白天激光光束的监视方法

介绍了采用曝光时间小于 10的高速CCD以及相应的图像卡成功实现白天强背景光下实时显示激光束的方法 ,该方法可以有效提高卫星激光测距的白天测距能力。     

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Very Large Format Back Illuminated CCDs

The University of Arizona Imaging Technology Laboratory has processed several types of very large format (>4K × 4K pixel) charge coupled devices for low light level scientific applications. These back illuminated devices were produced from frontside die fabricated by or for Fairchild Imaging Systems, Semiconductor Technology Associates, the Jet Propulsion Laboratory, and Kodak. A Philips 7K × 9K frontside device has also been processed using similar techniques. The backside sensors yield >90% quantum efficiency (QE). All devices show excellent charge transfer efficiency (CTE > 0.999997) at operating temperatures (typically –100 °C). Devices specifically designed for low signal applications have been demonstrated with less than 4 electrons read noise. This revised version was published online in July 2006 with corrections to the Cover Date.