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Spatial light modulator aided noninvasive imaging through scattering layers.

Saswata Mukherjee¹, A Vijayakumar², Joseph Rosen²

¹School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva, 8410501, Israel. saswata7@gmail.com.

Scientific Reports

|November 29, 2019

Summary

This summary is machine-generated.

This study introduces a novel noninvasive imaging method using a spatial light modulator (SLM) to see through scattering layers. The technique enhances image clarity by digitally engineering the point spread function and minimizing background noise.

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Area of Science:

Optics and Photonics
Image Processing
Noninvasive Imaging

Background:

Scattering layers impede direct optical imaging.
Noninvasive techniques are crucial for observing hidden structures.
Spatial Light Modulators (SLMs) offer dynamic control over light wavefronts.

Purpose of the Study:

To develop and demonstrate a new imaging technique for noninvasively visualizing objects obscured by scattering media.
To leverage SLMs for enhanced image retrieval through scattering layers.
To improve image quality by reducing noise and increasing reliability.

Main Methods:

A relay system projects light patterns from a scattering layer onto an SLM.
Two distinct coded phase masks are sequentially displayed on the SLM.
Intensity patterns are recorded by a digital camera after modulation by the SLM.
A modified phase retrieval algorithm is employed for image reconstruction.

Main Results:

Digitally synthesized coded phase masks allow for engineered point spread functions, improving image retrieval reliability.
Subtraction of two recorded intensity patterns effectively minimizes background noise in the recovered image.
The combined approach enables accurate and relatively easy convergence to the image of the covered object.

Conclusions:

The proposed imaging technique successfully enables noninvasive visualization through scattering layers.
The use of SLMs with coded phase masks and a modified phase retrieval algorithm significantly enhances image quality and reliability.
This method offers a promising solution for imaging applications where objects are hidden behind scattering media.