TY - JOUR

T1 - Noise reduction on single-shot images using an autoencoder

AU - Bartlett, Oliver J

AU - Benoit, David M

AU - Pimbblet, Kevin A

AU - Simmons, Brooke

AU - Hunt, Laura

N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notics of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Oliver J Bartlett, David M Benoit, Kevin A Pimbblet, Brooke Simmons, Laura Hunt, Noise reduction in single-shot images using an auto-encoder, Monthly Notices of the Royal Astronomical Society, Volume 521, Issue 4, June 2023, Pages 6318–6329, https://doi.org/10.1093/mnras/stad665 is available online at: https://academic.oup.com/mnras/article/521/4/6318/7068107

PY - 2023/6/30

Y1 - 2023/6/30

N2 - We present an application of autoencoders to the problem of noise reduction in single-shot astronomical images and explore its suitability for upcoming large-scale surveys. Autoencoders are a machine learning model that summarises an input to identify its key features, then from this knowledge predicts a representation of a different input. The broad aim of our autoencoder model is to retain morphological information (e.g., non-parametric morphological information) from the survey data whilst simultaneously reducing the noise contained in the image. We implement an autoencoder with convolutional and maxpooling layers. We test our implementation on images from the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) that contain varying levels of noise and report how successful our autoencoder is by considering Mean Squared Error (MSE), Structural Similarity Index (SSIM), the second-order moment of the brightest 20% of the galaxy’s flux M20, and the Gini Coefficient, whilst noting how the results vary between original images, stacked images, and noise reduced images. We show that we are able to reduce noise, over many different targets of observations, whilst retaining the galaxy’s morphology, with metric evaluation on a target-by-target analysis. We establish that this process manages to achieve a positive result in a matter of minutes, and by only using one single-shot image compared to multiple survey images found in other noise reduction techniques

AB - We present an application of autoencoders to the problem of noise reduction in single-shot astronomical images and explore its suitability for upcoming large-scale surveys. Autoencoders are a machine learning model that summarises an input to identify its key features, then from this knowledge predicts a representation of a different input. The broad aim of our autoencoder model is to retain morphological information (e.g., non-parametric morphological information) from the survey data whilst simultaneously reducing the noise contained in the image. We implement an autoencoder with convolutional and maxpooling layers. We test our implementation on images from the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) that contain varying levels of noise and report how successful our autoencoder is by considering Mean Squared Error (MSE), Structural Similarity Index (SSIM), the second-order moment of the brightest 20% of the galaxy’s flux M20, and the Gini Coefficient, whilst noting how the results vary between original images, stacked images, and noise reduced images. We show that we are able to reduce noise, over many different targets of observations, whilst retaining the galaxy’s morphology, with metric evaluation on a target-by-target analysis. We establish that this process manages to achieve a positive result in a matter of minutes, and by only using one single-shot image compared to multiple survey images found in other noise reduction techniques

KW - Space and Planetary Science

KW - Astronomy and Astrophysics

U2 - 10.1093/mnras/stad665

DO - 10.1093/mnras/stad665

M3 - Journal article

VL - 521

SP - 6318

EP - 6329

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -