Single-shot speckle reduction by elimination of redundant speckle patterns in digital holography

The coherent noise always exists in digital holographic microscopy due to the laser source, degrading the image quality. A method of speckle suppression using the dynamic speckle illumination, produced by double-moving diffusers, is presented in digital holographic microscopy. The space–time correlation functions are theoretically analyzed from the statistics distribution in the doubly and singly scattered system, respectively. The configuration of double-moving diffusers is demonstrated to have better performance in speckle suppression compared with the single diffuser and moving-static double diffusers cases. The experiment results verify the feasibility of the approach. The presented approach only requires a single shot interferogram to realize the speckle reduction, accordingly it has the potential application in real-time measurement.

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Single-shot, dual-wavelength digital holography based on polarizing separation

Applied Optics ◽

10.1364/ao.50.003360 ◽

2011 ◽

Vol 50 (19) ◽

pp. 3360 ◽

Cited By ~ 73

Author(s):

D. G. Abdelsalam ◽

Robert Magnusson ◽

Daesuk Kim

Keyword(s):

Digital Holography ◽

Dual Wavelength ◽

Single Shot

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Quality assessment of digital speckle patterns for the single-shot speckle projection profilometry based on a visualised simulation platform

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2021.106571 ◽

2021 ◽

Vol 141 ◽

pp. 106571

Author(s):

Huisi Miao ◽

Fuqiang Zhong ◽

Changyan Xiao ◽

Wei Huang ◽

Chuhan Wu ◽

...

Keyword(s):

Quality Assessment ◽

Single Shot ◽

Simulation Platform ◽

Speckle Patterns ◽

Digital Speckle

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Single-shot three-dimensional shape measurement by low-coherent optical path difference digital holography

Applied Optics ◽

10.1364/ao.53.000g19 ◽

2014 ◽

Vol 53 (27) ◽

pp. G19 ◽

Cited By ~ 6

Author(s):

Yuji Tanaka ◽

Yutaka Mori ◽

Takanori Nomura

Keyword(s):

Digital Holography ◽

Three Dimensional ◽

Optical Path Difference ◽

Path Difference ◽

Optical Path ◽

Shape Measurement ◽

Single Shot ◽

Dimensional Shape ◽

Three Dimensional Shape

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A Quantitative Approach to Speckle Reduction via Frequency Compounding

Ultrasonic Imaging ◽

10.1177/016173468600800301 ◽

1986 ◽

Vol 8 (3) ◽

pp. 151-164 ◽

Cited By ~ 32

Author(s):

G.E. Trahey ◽

J.W. Allison ◽

S.W. Smith ◽

O.T. von Ramm

Keyword(s):

Speckle Pattern ◽

Imaging Systems ◽

Center Frequency ◽

Speckle Reduction ◽

Optimal Method ◽

Pattern Change ◽

Multiple Imaging ◽

Speckle Patterns ◽

Contrast Reduction ◽

Ultrasonic Images

Coherent speckle is a source of image noise in ultrasonic B-mode imaging. The use of multiple imaging frequencies has been suggested as a technique for speckle contrast reduction. This technique involves the averaging of images whose speckle patterns have been modified by a change in the spectrum of the transmitted or received acoustical pulse. We have measured the rate of this speckle pattern change in ultrasonic images as a function of the change in center frequency of the transmitted acoustical pulse. This data is used to quantitatively describe the trade-off of resolution loss versus speckle reduction encountered when frequency compounding is employed and to derive the optimal method of frequency compounding. These results are then used as a basis for describing the overall advisability of frequency compounding in ultrasonic imaging systems. Our analysis indicates that simple frequency compounding is counterproductive in improving image quality.

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