Subjects: Astronomy >> Astronomical Instruments and Techniques submitted time 2018-06-21 Cooperative journals: 《天文研究与技术》
Abstract： In the research of the Solar observation, the registration between high-resolution observation images and full-disk Solar images is a greatly meaningful work. However, it is difficult to register with high accuracy due to the rotation, scaling and translation between them. This paper presents an image registration method combining local statistical information and control point matching: At first, between the high-resolution observation image and the full-disk Solar image is preliminary estimated about the orientation, scale, and positional parameters. Then the images are pretreated based on the estimated parameters. And then the pretreatment of the field of view is divided into a large number of overlapping local regions equally. Each corresponding local area is determined by the Correlation matching on the full-disk after preprocessing. Next, the sub-pixel offset between each pair of local regions is then measured, and the coordinate positions of the feature point are determined according to the sub-pixel offset between each pair of local regions, which is used as the feature control point in the point matching. Finally, the conversion equations of the affine transformation are established according to the control point, then use the least squares to solve the entire field of view of the transformation parameters. The image is reiterated according to the parameters to be solved, and the transformation parameters are obtained after the final iteration to register images. By registering the high-resolution observation images and the full-disk Solar SDO/HMI continuous spectrum, the deviation of fitting results is within 0.25 arc-seconds.
Subjects: Astronomy >> Astrophysical processes submitted time 2018-05-28 Cooperative journals: 《天文研究与技术》
Abstract： 太阳图像中包含了各种不同尺度、不同结构以及不同亮度的活动现象，它们都是实测太阳物理的研究目标。这些活动现象经常会使图像显示的跨度过大，导致图像暗弱细节结构被隐藏。对于地基望远镜，由于地球大气对观测数据的影响，也造成图像整体对比度下降。这些都不利于人们直观地从图像中发现感兴趣的太阳活动现象或结构特征。针对这些问题，运用直方图规定化的方法对实测太阳物理中常遇到的几类观测目标图像（太阳极紫外像，太阳光球黑子像，色球活动区像以及色球日珥像）进行处理，通过瑞利分布、双高斯分布以及三重瑞利混合分布等直方图形式实现对这几类图像的显示对比度增强。通过对空间望远镜SDO的极紫外太阳像和1m新真空太阳望远镜（New Vacuum Solar Telescope, NVST）的色球和光球像的处理展示了该方法的处理效果。结果表明,方法可以有效提高各类太阳活动现象的显示度，便于人们在研究初期发现感兴趣的活动现象。
Subjects: Astronomy >> Astrophysical processes submitted time 2017-10-20 Cooperative journals: 《天文研究与技术》
Abstract：我国明安图射电频谱日像仪(Mingantu Ultrawide SpEctral Radio Heliograph, MUSER)已经完成所有的硬件设备安装与调试，即将进入常规观测。为有效地保证观测数据的可用性，项目组购置了Vantage Pro自动气象站，用以实时监控观测地的气象条件变化。首先介绍了MUSER项目的基本情况，论述了在项目中气象条件的应用场景及在数据处理时对数据有效性可能造成的影响;详细介绍了Vantage Pro气象站的数据采集格式、数据交换格式以及串行通信协议;介绍了在气象数据的存储方式;最后给出了构建气象数据服务、数据归档和高效查询的方法。可以应用在望远镜自动气象监控和数据处理方面，也可以为选址的自动气象监测提供春考
Subjects: Astronomy >> Astrophysical processes submitted time 2017-09-26 Cooperative journals: 《天文研究与技术》
Abstract：在太阳观测研究中，高分辨图像与全日面像的配准是一项非常有意义的工作，但由于他们之间存在着旋转、缩放和平移，因此很难高精度地进行匹配。提出一种结合局部统计信息和控制点匹配的图像配准方法，核心思想为将视场等间隔划分为大量重叠的局部区域，通过相关匹配在全日面像上寻找对应的局部区域，然后计算每一对局部区域间的亚像元偏移，根据偏移量确定每一对特征点的坐标位置，据此作为点匹配中的特征控制点；最后根据控制点建立仿射变换的转换方程，采用最小二乘求解整个视场的转换参数，根据解出的参数重新对图像进行迭代，得到收敛后的结果并进行配准。通过对高分辨观测图像和全日面SDO/HMI连续谱图像进行配准，拟合结果的偏差在0.25” 以内。
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