Optical Microscopy Image Restoration and Its Application in Strain Measurements Using the Digital Image Correlation Method

Wei Han; Dan Wu

doi:10.3788/LOP221822

Laser & Optoelectronics Progress, Volume. 60, Issue 14, 1410004(2023)

Optical Microscopy Image Restoration and Its Application in Strain Measurements Using the Digital Image Correlation Method

Wei Han and Dan Wu^*

Author Affiliations

School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, Zhejiang, China

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Abstract Get PDF(in Chinese)

Figures & Tables(16)

Fig. 1. Speckle images and its corresponding grayscale histograms. (a1) (a2) Clear; (b1) (b2) defocus blurred

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Fig. 2. $R_{Z S R}$ value of the speckle image and corresponding gray gradient sum value. (a) $R_{Z S R}$ value; (b) corresponding gray gradient sum value

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Fig. 3. Relative error of displacement after translation of 0.2 pixel

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Fig. 4. Clear speckle image (800 pixel×600 pixel)

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Fig. 5. Speckle patterns with different defocusing degrees (800 pixel×600 pixel). (a)-(f) Objective lens 22, 26, 30, 34, 38, 42 μm away from sample surface

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Fig. 6. Blind deconvolution restoration results for different sizes of PSF (800 pixel×600 pixel). (a)-(f) 3×3, 7×7, 11×11, 13×13, 15×15, 17×17

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Fig. 7. Comparison before and after recovery. (a) Defocus blurred speckle image pre-restored; (b) Gaussian denoise contrast-corrected speckle image after final restoration

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Fig. 8. Defocused blurred speckle images before restoration, the blind deconvolution restored speckle images and the Gaussian denoising contrast corrected speckle images and their corresponding gray level histograms. (a1) (a2) Defocused blurred speckle image and its corresponding gray histogram before restoration; (b1) (b2) blind deconvolution restored speckle pattern and its corresponding gray histogram; (c1) (c2) Gaussian denoising contrast corrected speckle pattern and its corresponding gray histogram

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Fig. 9. Average gray gradient of restoration results of different defocused blurred speckle patterns

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Fig. 10. Relative displacement error of different images

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Fig. 11. Relative error of calculated displacement when translation amount is 0-1 pixel

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Fig. 12. Speckle images under different loads. (a)-(f) 1 N, 2 N, 3.2 N, 3.6 N, 4.0 N, 4.4 N

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Fig. 13. Speckle images with defocus blur and final restored speckle images under different loads. (a1) (a2) 3.6 N; (b1) (b2) 4.4 N

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Fig. 14. Stress-strain fitting curve and error comparison. (a) Stress-strain linear fitting before and after restoration of speckle image under 0-4.4 N load; (b) error comparison before and after restoration of speckle image under 2.2-4.4 N load

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Table 1. Mean intensity gradient before and after restoration in different sizes of PSF
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Table 1. Mean intensity gradient before and after restoration in different sizes of PSF
Parameter Pre-restored 3×3 7×7 11×11 13×13 15×15 17×17
Mean intensity gradient 2.4901 3.3249 4.3151 4.7481 5.2160 4.9207 4.3432

Table 2. Statistical value of strain error calculated by digital image correlation before and after restoration of speckle image under 2.2-4.4 N load

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Table 2. Statistical value of strain error calculated by digital image correlation before and after restoration of speckle image under 2.2-4.4 N load

ITO film stretching	Pre-restored		Deconvblind-Gauss-Gamma
ITO film stretching	Maximum error /ε	RMSE /ε	Maximum error /ε	RMSE /ε
Region 1	$1.06 \times 10^{- 3}$	$0.27 \times 10^{- 3}$	$0.23 \times 10^{- 3}$	$0.05 \times 10^{- 3}$
Region 2	$0.92 \times 10^{- 3}$	$0.21 \times 10^{- 3}$	$0.20 \times 10^{- 3}$	$0.04 \times 10^{- 3}$
Region 3	$1.21 \times 10^{- 3}$	$0.34 \times 10^{- 3}$	$0.31 \times 10^{- 3}$	$0.11 \times 10^{- 3}$
Region 4	$1.16 \times 10^{- 3}$	$0.31 \times 10^{- 3}$	$0.27 \times 10^{- 3}$	$0.08 \times 10^{- 3}$

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Wei Han, Dan Wu. Optical Microscopy Image Restoration and Its Application in Strain Measurements Using the Digital Image Correlation Method[J]. Laser & Optoelectronics Progress, 2023, 60(14): 1410004

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Paper Information

Category: Image Processing

Received: Jun. 13, 2022

Accepted: Aug. 20, 2022

Published Online: Jul. 17, 2023

The Author Email: Wu Dan (wudan@nbu.edu.cn)

DOI:10.3788/LOP221822

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Mean intensity gradient before and after restoration in different sizes of PSF

Table 1. Mean intensity gradient before and after restoration in different sizes of PSF

Table 2. Statistical value of strain error calculated by digital image correlation before and after restoration of speckle image under 2.2-4.4 N load

Table 2. Statistical value of strain error calculated by digital image correlation before and after restoration of speckle image under 2.2-4.4 N load