CBERS-1 PSF估计与图像复原

分析了遥感图像获取过程中导致图像退化模糊的原因。讨论了一种借助图像中的特定线状目标信息(如桥梁、堤坝等)，采用经验拟合的方式提取图像获取、传输过程中的点扩散函数，并利用该点扩散函数结合频域维纳滤波器求解去图像模糊的空域反卷积算子。将该方法应用于中巴资源卫星一号(CBERS-1)图像，图像质量得到明显的提高，收到了较好的复原效果。     

Keck AO observations of Io in and out of eclipse

We present adaptive optics (AO) observations of Io taken with the W.M. Keck II telescope on 18 December 2001 (UT) before the satellite went into eclipse, and while it was in Jupiter's shadow. Making these kind of Io-in-eclipse observations, as well as the associated data reduction and analysis are challenging; hence one focus of the paper is to explain the methods and tools used for these data sets. For the sunlit images Io itself was used as the wavefront reference source, while nearby Ganymede was used as reference ‘star’ when Io was in eclipse. Observations were obtained in K′-, L′-, and M-bands. The sunlit images have been deconvolved using MISTRAL. The Io-in-eclipse data were deconvolved with IDAC and MISTRAL. The former gives better results, both in absolute photometry and in matching the original images. We determined the flux densities of the hot spots from the original Io-in-eclipse data with StarFinder, as well as from the deconvolved images by integrating the intensity over the relevant areas. We determined the highly anisoplanatic PSF via a FFT method from the original data, and used this in StarFinder and as a starting PSF for IDAC and MISTRAL. We derived temperatures and areal coverage of all 19 spots detected in both K′- and L′-band images of Io-in-eclipse. We also determined temperatures and areal coverage of the hot spots visible on the L′- and M-band images of sunlit Io. Most volcanoes contain a compact hot ‘core’ (?10 km² at 600-800 K) within a larger area at lower temperatures (e.g., ∼10²-10⁴ km² at 300-500 K). The total heat flow contributed by these active volcanoes is 0.2 W m⁻², ∼8% of the average global heat flow measured at 5-20 μm by Veeder et al. [J. Geophys. Res. 99 (1994) 17095].     

亚m级卫星TDI CCD立体测绘相机成像仿真

以三角网和贴面纹理影像为精细地面模型的数据构成,以亚m级TDI CCD(time delay and iintegration charge coupled devices)立体测绘相机为仿真对象进行成像仿真。通过建立每个像元的\     

HST WFPC2天体测量和测光方法最新进展

对于哈勃空间望远镜(HST)来说，其广角行星照相机(WFPC2)的CCD性能的数据处理校正对提高天体测量和测光结果的精度有着重要意义。最近几年由于WFPC2对精度要求越来越高，其数据处理方法和校正方法包括点扩散函数、行误差和畸变修正等各个方面的研究都有了很大改进和进展。对近年来上述方面的最新进展作了介绍，并评价了其优缺点，提出了一些有待解决的问题。     

优化点扩散函数估计与稀疏约束的图像盲复原

在卫星光学图像盲复原问题中,点扩散函数的估计和复原模型选择对结果影响很大。针对点扩散函数模板估计困难的问题,该文在分析图像中近似点状地物成像特点的基础上,提出了基于点状地物信息的椭圆抛物面模型点扩散函数估计方法,得到较好的点扩散函数模板;针对图像噪声对复原的影响问题,采用能够分离图像的信号和噪声的归一化稀疏约束模型进行盲复原。利用"吉林一号"卫星图像进行了实验。结果表明:该文提出的优化点扩散函数估计方法可行,盲复原后图像质量得到了提高。