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A New Use for Deep Learning — Hologram Reconstruction

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Researchers have used a deep learning-based, computational approach to reconstruct a hologram and form a microscopic image of an object. This deep learning-based technique rapidly eliminates twin-image and self-interference-related artifacts using only one hologram intensity. It also uses fewer measurements to reconstruct improved phase and amplitude images of the objects.

According to the research team, compared to existing holographic phase recovery approaches, this neural network framework is significantly faster to compute and could provide a new framework in holographic image reconstruction.

The team from University of California at Los Angeles (UCLA) validated its method by reconstructing the phase and amplitude images of various samples, including blood and Pap smears and tissue sections. The holograms all demonstrated successful elimination of spatial artifacts — once trained, the neural network had learned how to extract and separate the spatial features of the true image of the object from undesired light interference and related artifacts.

Researchers achieved hologram recovery without any modeling of light-matter interaction or a solution to the wave equation. 

According to researchers, the results are applicable to any phase recovery and holographic imaging problem. Professor Aydogan Ozcan (UCLA and Howard Hughes Medical Institute) said that the deep learning-based framework could open up a myriad of opportunities to design new coherent imaging systems spanning different parts of the electromagnetic spectrum, including visible wavelengths and the x-ray regime.

The research was published in Light: Science & Applications (doi:10.1038/lsa.2017.141).

Published: February 2018
Glossary
deep learning
Deep learning is a subset of machine learning that involves the use of artificial neural networks to model and solve complex problems. The term "deep" in deep learning refers to the use of deep neural networks, which are neural networks with multiple layers (deep architectures). These networks, often called deep neural networks or deep neural architectures, have the ability to automatically learn hierarchical representations of data. Key concepts and components of deep learning include: ...
machine learning
Machine learning (ML) is a subset of artificial intelligence (AI) that focuses on the development of algorithms and statistical models that enable computers to improve their performance on a specific task through experience or training. Instead of being explicitly programmed to perform a task, a machine learning system learns from data and examples. The primary goal of machine learning is to develop models that can generalize patterns from data and make predictions or decisions without being...
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