Laser Biospeckle Technique Based on Wavelet Energy Spectrum Maps

Qi Sun; Huanqiu Zhan; Zhaolou Cao; Wei Liu

doi:10.3788/LOP213297

Laser & Optoelectronics Progress, Volume. 60, Issue 6, 0611004(2023)

Laser Biospeckle Technique Based on Wavelet Energy Spectrum Maps

Qi Sun, Huanqiu Zhan, Zhaolou Cao^*, and Wei Liu

School of Physics and Optoelectronics, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu , China

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Figures & Tables(11)

Fig. 1. Laser speckle image acquisition device. (a) Internal device of experimental platform; (b) appearance of experimental platform

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Fig. 2. Annotated map of experimental area

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Fig. 3. Image processing and analysis flowchart

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Fig. 4. Original laser speckle images. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Fig. 5. Speckle images processed by WGD method and Fujii method. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Fig. 6. Speckle images processed by new method based on wavelet energy spectrum. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Fig. 7. EID levelization in damaged area of different degrees. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Fig. 8. Wavelet entropy levelization in damaged area of different degrees. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Fig. 9. IM levelization in damaged area of different degrees. (a) Before impact; (b) 1 h after impact; (c) 1 d after impact

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Table 1. Comparison of difference in speckle activity of images processed by different methods
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Table 1. Comparison of difference in speckle activity of images processed by different methods
Parameter Result images of different methods
Original image Fujii image WGD image Energy spectrum
I_h 158.71 72.82 106.97 87.88
I_l 141.38 74.38 95.56 42.36
AC 0.06 0.01 0.06 0.35

Table 2. Statistical results of EID index, improved IM index, and wavelet entropy index

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Table 2. Statistical results of EID index, improved IM index, and wavelet entropy index

Method	Parameters	Time
Method	Parameters	Before impact	1 h after impact	1 d after impact
Improved IM index	CV	0.2484	0.1788	0.1472
Improved IM index	DQ	142.9105	150.3229	187.2534
Wavelet Entropy index	CV	0.4798	0.1848	0.1047
Wavelet Entropy index	DQ	0.0890	0.0918	0.0781
EID index	CV	0.0187	0.0114	0.0179
EID index	DQ	0.0160	0.0064	0.0189

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Qi Sun, Huanqiu Zhan, Zhaolou Cao, Wei Liu. Laser Biospeckle Technique Based on Wavelet Energy Spectrum Maps[J]. Laser & Optoelectronics Progress, 2023, 60(6): 0611004

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Paper Information

Category: Imaging Systems

Received: Dec. 21, 2021

Accepted: Jan. 24, 2022

Published Online: Mar. 16, 2023

The Author Email: Zhaolou Cao (phoenixczl@nuist.edu.cn)

DOI:10.3788/LOP213297

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Comparison of difference in speckle activity of images processed by different methods

Table 1. Comparison of difference in speckle activity of images processed by different methods

Table 2. Statistical results of EID index, improved IM index, and wavelet entropy index

Table 2. Statistical results of EID index, improved IM index, and wavelet entropy index