# Noise reduction on single-shot images using an autoencoder

## TL;DR

This paper demonstrates that convolutional autoencoders can effectively reduce noise in single-shot astronomical images while preserving morphological details, offering a fast and efficient alternative to traditional multi-image stacking methods.

## Contribution

The study introduces a convolutional autoencoder approach for noise reduction in single-shot astronomical images, maintaining morphological features and outperforming traditional methods in speed and simplicity.

## Key findings

- Autoencoders successfully reduce noise while preserving galaxy morphology.
- The method achieves positive results within minutes using only one image.
- Performance metrics indicate improved image quality over original and stacked images.

## Abstract

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 percent of the galaxy's flux M20, and the Gini coefficient, whilst noting how the results vary between the original images, stacked images, and noise reduced images. We show that we are able to reduce noice, 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.