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Speckled speckled speckle.

Justin Dove, Jeffrey H Shapiro

|August 6, 2020

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This summary is machine-generated.

Speckle, or light pattern fluctuations, is understood for continuous-wave (cw) illumination. This study explores higher-order speckle crucial for non-line-of-sight (NLoS) imaging with coherent light.

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Area of Science:

Optics
Photonics
Imaging Science

Background:

Speckle arises from coherent light reflecting off rough surfaces, causing spatial irradiance fluctuations.
Existing understanding of speckle is primarily for continuous-wave (cw) illumination.
Emerging non-line-of-sight (NLoS) imaging techniques require understanding higher-order speckle from multiple reflections and modulated illumination.

Purpose of the Study:

To investigate higher-order speckle phenomena relevant to advanced NLoS imaging.
To analyze speckle characteristics under both continuous-wave (cw) and amplitude-modulated coherent illumination.
To provide insights into the feasibility of NLoS imaging with current and emerging coherent light techniques.

Main Methods:

Utilized a three-diffuser transmissive geometry as a model for three-bounce NLoS imaging.
Analyzed speckle irradiance variances in the small-diffuser limit for both cw and modulated illumination.
Investigated third-order cw speckle and first-order modulated speckle for extended diffuse reflectors.

Main Results:

In the small-diffuser limit, cw and modulated nth-order speckle irradiance variances are equal.
Higher-order speckle irradiance variances are (2^n - 1) times those of first-order speckle.
For extended diffusers, speckle is unlikely to hinder cw NLoS imagers and potentially phasor-field imagers.

Conclusions:

Speckle behavior in NLoS imaging scenarios, particularly with multiple reflections, is characterized.
The findings suggest that speckle effects are manageable for current and future coherent-illumination NLoS imaging systems.
This research supports the advancement of NLoS imaging technologies utilizing coherent light sources.