氦离子显微镜能够提供所有扫描射线法中最高空间分辨率的表面图像，以及极高的表面灵敏度。
Helium ion microscopy (HIM) offers the highest spatial resolution surface imaging of any scanning beam method, as well as extremely high surface sensitivity.
针对典型的空间目标，文章采用稀疏成份分析法研究了一维距离像的超分辨重构和特征提取问题。
Aiming at the classic space targets, this paper discusses the reconstruction and feature extraction of HRR profiles by sparse component analysis.
我们是国际上唯一的正空间六维搜索法，预计在低分辨率结构解析中会有重要应用。
Six-dimensional search in real space can complement that in reciprocal space and our work is the first of this kind in real space.
方法：在实验室搭建实验装置，分别利用矩形光栅法的实验装置和平板法视网膜MTF测量仪器，来测定正视眼组和屈光不正组的不同空间频率条纹分辨的阈值，算出并分析比较所测MTF值。
METHODS: Retina MTF of two groups of people with emmetropia and ametropia were measured by means of a grating and parallel plate respectively. Then the measured MTF were compared and analyzed.
方法：在实验室搭建实验装置，分别利用矩形光栅法的实验装置和平板法视网膜MTF测量仪器，来测定正视眼组和屈光不正组的不同空间频率条纹分辨的阈值，算出并分析比较所测MTF值。
METHODS: Retina MTF of two groups of people with emmetropia and ametropia were measured by means of a grating and parallel plate respectively. Then the measured MTF were compared and analyzed.
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