选帧技术在太阳高分辨成像中的应用

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	选帧技术在太阳高分辨成像中的应用
其他题名	The Application of Frame Selection Technology in Solar High-Resolution Imaging
	刘长玉
学位类型	硕士
导师	金振宇
	2013-04
学位授予单位	中国科学院研究生院（云南天文台）
学位授予地点	北京
学位专业	天文技术与方法
关键词	高分辨统计重建像质评价斑点干涉术选帧方法 Lucky Imaging
摘要	在太阳观测上，获得高分辨的数据对研究太阳小尺度结构非常必要，但是地球大气湍流的影响导致地基光学望远镜无法实现衍射极限成像。为克服大气湍流实现高分辨成像的办法有自适应光学技术和高分辨统计重建技术。选帧是一种在自适应光学和图像统计重建中经常用到的技术，它通过某种像质评价标准将像质退化严重的图像剔除，以达到缩短数据处理时间，同时在一定程度上提高图像的重建效果的作用。合适的像质评价函数是选帧的关键，太阳观测中常计算米粒组织的均方根（RMS）对图像进行像质评价。但是当目标结构比较复杂时，RMS更多的反应的是图像本身的内容变化而不是像质。本文提出一种基于斑点干涉术的选帧的方法（SI选帧法），与传统的基于图像本身的像质评价函数相比，这种方法的优点在于其将有关目标的量消除，像质评价参数只包含跟望远镜和大气视宁度参数有关的量，能更准确反映由大气湍流引起的像质变化。文章首先简单介绍了几种常用的高分辨统计重建方法以及点源目标常用的高分辨成像技术Lucky Imaging，随后介绍了扩展目标常用的像质评价函数及其特点。在文章的第四章介绍了斑点干涉术选帧方法的提出、基本原理以及选帧参数的初步确定。在第五章，给出了SI法与常用选帧方法的模拟实验比较结果，探讨了SI选帧法在太阳高分辨成像观测中的应用。
其他摘要	In solar observation, getting high-resolution solar image is important for studying the small scale struction of the sun. But the ground-telescope can’t actualize diffraction limted imaging owe to atmospheric turbulence. Adaptive Optics (AO) and High-resolution Statistical Reconstruction Method can overcome the influence of atmospheric turbulence to obtain high resolution images. Frame seleciton is one technique offen performed in AO and High-resolution Statistical Reconstruction. Images that severely degraded are discarded according to some image quality criteria so the time for image post-processing can be shorten, and the reconstruction effect can be improved in some extent. The key point for frame selection is the image quality metric. In solar observations, rms of the granulation is off calculated to evaluation image quality. But when the region contains very dark and very bright features, the rms should be very high, it would rather reflect the image content itself, but not the quality of the image. In this paper a frame selection method based on speckle interferometry (SI method) is proposed, its advantage lies in that it eliminates the information of the object and contains information only about the telescope and the turbulent atmosphere, can be more accurately reflect the effect of atmosphere turbulence. There is a simple introduction of High-Resolution Statistical Reconstruction Method and lucky imaging which offen used by point object, then the image quality evaluation function of extended objects and their characteristics. In chaper four, there is an introduction of the proposal and fundamental of the frame selection method based on speckle interferometry (SI selection method for short). At last, the parameter of SI selection method is determined preliminary. In chaper five, the simulation results of SI selection method compared with the usually used frame selection method are presented and the application of the SI selection method in solar high resolution observations are explored.
学科领域	天文学
页数	51
语种	中文
文献类型	学位论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4907
专题	天文技术实验室
推荐引用方式 GB/T 7714	刘长玉. 选帧技术在太阳高分辨成像中的应用[D]. 北京. 中国科学院研究生院（云南天文台）,2013.

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