In the field of laser speckle measurement, background interference has always been a major factor affecting the accuracy of measurements. The traditional Fourier analysis method can eliminate the background noise with certain periodicity, but the processing effect is not good for the complex background, and the operation of the signal is easy to lead to new errors. This study explores the application of a speckle differential measurement method in laser projection images through experiments with one-dimensional and two-dimensional sinusoidal signals, as well as step signals, combined with data simulation and actual measurement verification. The results demonstrate that this method effectively mitigates the interference caused by screen structure, brightness inhomogeneity, and pixel structure on measurement outcomes. Furthermore, it significantly enhances the accuracy of speckle contrast measurement. This research provides a simple and reliable new approach for the accurate measurement of speckle contrast.
| [1] |
Goodman J W. Some fundamental properties of speckle. Journal of the Optical Society of America, 1976, 66(11): 1145-1150 J]
|
| [2] |
Kinoshita J, Yamamoto K, Kuroda K. Scale factor effect of RGB monochromatic speckle grains on color speckle distribution. Optical review, 2023, 30(1): 100-110 J]
|
| [3] |
Regan-Fendt K E, Izumi K. Nuclear speckleopathies: developmental disorders caused by variants in genes encoding nuclear speckle proteins. Human genetics, 2024, 143(4): 529-544 J]
|
| [4] |
Kunihiko E, Ryoichi H, Yohei N, et al. . Spectral speckle-correlation imaging. Applied optics, 2021, 60: 2388-2392 J]
|
| [5] |
Zhang H, Hu Y, Peng S, et al. . Study on speckle noise reduction in laser projection displays. Photonics, 2024, 11(4): 290 J]
|
| [6] |
IEC 62906-5-4: 2018[S/OL]. [2018-01-09]. https://webstore.iec.ch/en/publication/26896.
|
| [7] |
Takatsu Y, Ueyama T, Miyati T, et al. . Simulation of the modulation transfer function dependent on the partial Fourier fraction in dynamic contrast enhancement magnetic resonance imaging. Australasian physical & engineering sciences in medicine, 2016, 39(4): 1-7 J]
|
| [8] |
Xu R J, Liu R, Peng Y J, et al. . P-15.4: dynamic measuring method of speckle contrast. SID international symposium digest of technical papers, 2023, 54(S1): 960-966 J]
|
| [9] |
Kobtscev S M. Measurement of laser radiation parameters by speckle interferometry. 2022 International Conference Laser Optics (ICLO), June 20–24, 2022, Saint Petersburg, Russian, 2022, Saint Petersburg, Fund of Laser Physics [C]
|
| [10] |
SHANG W, ZHANG W, WU Z, et al. SNR analysis with speckle noise in interferometry using monochromatic expanded source and fringe localization[J]. Optics communications, 2019: 124451.
|
| [11] |
IEC 62906-5-2: 2016[S/OL]. [2016-06-07]. https://webstore.iec.ch/en/publication/25037.
|
| [12] |
Zeng B, Ng M K. Generalized Gamma distributions for modeling and analyzing speckle in ultrasound images. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2022, 69: 2162-2174 [J]
|
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