彗星彗发形态特征定量研究中图像增强技术的比较研究
Image Enhancement Techniques for Quantitative Investigations of Morphological Features in Cometary Comae: A Comparative Study
摘要：
许多彗星的彗发特征只比环境彗发高出百分之几（即，背景），因此需要彗发增强技术来辨别彗星彗发中存在的形态结构。通过分类和比较分析，讨论了彗星科学家广泛使用的一系列图像增强技术。详细描述了增强技术和相应的特性，并提供了相应的数学表示。由于本文中提出的比较分析利用具有已知彗差特征的模拟图像，因此特征识别以及由增强引起的伪影提供了对各种技术的客观和明确的评估。提供的例子，突出对比能力的不同的技术，挑选出不同的质量特征的广泛不同的优势和空间尺度。考虑到这一点以及与某些增强技术相关的严重图像伪影和虚假特征，强烈建议使用定性不同的技术确认彗差特征的存在。
英文摘要：
Many cometary coma features are only a few percent above the ambient coma (i.e., the background) and therefore coma enhancement techniques are needed to discern the morphological structures present in cometary comae. A range of image enhancement techniques widely used by cometary scientists is discussed by categorizing them and carrying out a comparative analysis. The enhancement techniques and the corresponding characteristics are described in detail and the respective mathematical representations are provided. As the comparative analyses presented in this paper make use of simulated images with known coma features, the feature identifications as well as the artifacts caused by enhancement provide an objective and definitive assessment of the various techniques. Examples are provided which highlight contrasting capabilities of different techniques to pick out qualitatively distinct features of widely different strengths and spatial scales. On account of this as well as serious image artifacts and spurious features associated with certain enhancement techniques, confirmation of the presence of coma features using qualitatively different techniques is strongly recommended.
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