Effect of fractal rough-surface Hurst exponent on speckle in imaging systems

Dongyel Kang; Tom D. Milster

doi:10.1364/OL.34.003247

Effect of fractal rough-surface Hurst exponent on speckle in imaging systems

Dongyel Kang
, Tom D. Milster

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Speckle image contrasts from a fractal rough-surface object are investigated in simulation, where the image surface is conjugate to the object surface. It is observed that the Hurst exponent H of fractal roughness affects speckle contrast and statistics dramatically. For example, a strong rough surface (σ_h > λ) exhibits Rayleigh statistics over increasing ranges of point spread function widths as H decreases. Conceptual explanations are also presented for effects of H and the coherence factor on speckle in imaging systems.

Original language	English (US)
Pages (from-to)	3247-3249
Number of pages	3
Journal	Optics letters
Volume	34
Issue number	20
DOIs	https://doi.org/10.1364/OL.34.003247
State	Published - Oct 15 2009

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OL.34.003247

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abstract = "Speckle image contrasts from a fractal rough-surface object are investigated in simulation, where the image surface is conjugate to the object surface. It is observed that the Hurst exponent H of fractal roughness affects speckle contrast and statistics dramatically. For example, a strong rough surface (σh > λ) exhibits Rayleigh statistics over increasing ranges of point spread function widths as H decreases. Conceptual explanations are also presented for effects of H and the coherence factor on speckle in imaging systems.",

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AB - Speckle image contrasts from a fractal rough-surface object are investigated in simulation, where the image surface is conjugate to the object surface. It is observed that the Hurst exponent H of fractal roughness affects speckle contrast and statistics dramatically. For example, a strong rough surface (σh > λ) exhibits Rayleigh statistics over increasing ranges of point spread function widths as H decreases. Conceptual explanations are also presented for effects of H and the coherence factor on speckle in imaging systems.

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Effect of fractal rough-surface Hurst exponent on speckle in imaging systems

Abstract

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