AutoSourceID-Light

fast optical source localization via U-net and Laplacian of Gaussian

F. Stoppa (Author), P. Vreeswijk (Author), S. Bloemen (Author), Saptashwa Bhattacharyya (Author), S. Caron (Author), Gudlaugur Johannesson (Author), Roberto Ruiz de Austri (Author), Chris van den Oetelaar (Author), Gabrijela Zaharijas (Author), P. J. Groot (Author)

Abstract

Aims: With the ever-increasing survey speed of optical wide-field telescopes and the importance of discovering transients when they are still young, rapid and reliable source localization is paramount. We present AutoSourceID-Light (ASID-L), an innovative framework that uses computer vision techniques that can naturally deal with large amounts of data and rapidly localize sources in optical images. Methods: We show that the ASID-L algorithm based on U-shaped networks and enhanced with a Laplacian of Gaussian filter provides outstanding performance in the localization of sources. A U-Net network discerns the sources in the images from many different artifacts and passes the result to a Laplacian of Gaussian filter that then estimates the exact location. Results: Using ASID-L on the optical images of the MeerLICHT telescope demonstrates the great speed and localization power of the method. We compare the results with SExtractor and show that our method outperforms this more widely used method rapidly detects more sources not only in low and mid-density fields, but particularly in areas with more than 150 sources per square arcminute. The training set and code used in this paper are publicly available.

Keywords

astronomical databases;data analysis;image processing;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UNG - University of Nova Gorica
UDC:	52
COBISS:	139051267
ISSN:	1432-0746
Views:	318
Downloads:	0
Average score:	0 (0 votes)
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Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	str. 1-8
Volume:	ǂVol. ǂ662
Issue:	[article no.] A109
Chronology:	Jun. 2022
DOI:	10.1051/0004-6361/202243250
ID:	17810879