National Astronomical Observatories, Chinese Academy of Science, Beijing 100012;
Department of Mechanical and Electric Engineering, China College of Mining and Technology, Beijing 100083;
National Astronomical Observatories, Chinese Academy of Science, Beijing 100012;
National Astronomical Observatories, Chinese Academy of Science, Beijing 100012;
National Astronomical Observatories, Chinese Academy of Science, Beijing 100012;
stars: images - techniques: image processing - methods: wavelet analysis;