کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4977583 1451932 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Extended faint source detection in astronomical hyperspectral images
ترجمه فارسی عنوان
تشخیص منبع نادری تمدید در تصاویر هیسپرتروسی نجومی
کلمات کلیدی
تصاویر فوق العاده آزمایش فرضیه، نسبت احتمال متعارف، افزایش فضایی، مشاهدات چندگانه، تصاویر نجومی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
چکیده انگلیسی
The circum-galactic medium consists in gas orbiting around galaxies, whose faintness prevents any complete and easy detection. A powerful tool to detect such pattern can be found in using hyperspectral imaging. Nevertheless, detection in hyperspectral datacubes faces various problems, including well-fitted signal and noise descriptions to ensure further discrimination. A specificity of astronomical images resides in dealing with faint and very noisy signals. In this paper, we introduce a new constrained generalized likelihood ratio test adapted to the problem and a compound test to exploit most of the available information. We also investigate the use of both spatial information and multiple observations on a single scene, to enhance robustness. Numerical experiments on synthetic data are performed to quantify the gain of the different approaches. Finally, results on real hyperspectral astronomical data are presented, which may map for the first time observation of the circum-galactic medium around faint and distant galaxies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Signal Processing - Volume 135, June 2017, Pages 274-283
نویسندگان
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