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吴荣; 陆阳; 欧阳爱国

doi:10.37188/CO.2023-0072

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doi: 10.37188/CO.2023-0072

吴荣 ^{1, 2,,},
陆阳 ^{1, 2},
欧阳爱国 ^{1, 2}

1.
华东交通大学智能机电装备创新研究院，江西南昌 330013
2.
华东交通大学机电与车辆工程学院，江西南昌 330013

基金项目:国家自然科学基金（No. 31760344）

详细信息

作者简介:
吴　荣（1988—），男，江西鄱阳人，博士，讲师，主要从事光学测量与图像处理方面的研究。E-mail：[email protected]

中图分类号:TH741
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- 网络出版日期: 2023-07-17

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WU Rong ^{1, 2
,,},
LU Yang ^{1, 2},
OUYANG Ai-guo ^{1, 2}

1.
Innovation Institute of Intelligent Electromechanical Equipment, East China Jiaotong University, Nanchang 330013, China
2.
School of Mechanical and Electrical Engineering, East China Jiaotong University, Nanchang 330013, China

Funds:Supported by National Natural Science Foundation of China (No. 31760344)

More Information

Corresponding author: [email protected]

摘要

摘要:
剪切散斑干涉是一种非接触式、全场高精度光学变形测量技术，由于环境等因素导致采集的散斑条纹图像存在大量随机噪声,进而影响测量精度。传统去噪方法在滤除噪声的同时，容易导致条纹边缘信息的丢失甚至破坏。针对该问题，本文提出基于365赌球注册网站。该方法首先对相位条纹图进行正余弦变换获得两幅图像，其次对这两幅图像分别运用双调滤波方法进行去噪，最后将滤波后的两幅图像合并为最终的相位条纹图。实验结果表明：经提出方法滤波后的相位图散斑抑制指数为0.999，平均保持指数为2.995，证明该方法较传统去噪方法更好地改善相位图质量，且能大程度保留相位条纹的细节及边缘信息。
- 剪切散斑干涉 /
- 光学测量 /
- 降噪 /
- 双调滤波
Abstract:
Shearography is a non-contact, full-field, and high-precision optical deformation measurement technology. There is a lot of random noise in the acquired speckle fringe pattern caused by environmental factors, which affects the measurement accuracy. The traditional denoising methods easily cause the fringe information to be lost or even damaged while filtering out the noise. To solve this problem, this paper proposes an image denoising method based on the combination of sine and cosine transform and bitonic filtering. In this method, the phase fringe image is firstly obtained by sine and cosine transform. Secondly, the two images are denoised by the bitonic filtering method respectively. Finally, the filtered two images are merged into the final phase fringe image. Experimental results show that for the filtered phase pattern, the speckle suppression index is 0.999 and the average retention index is 2.995, which prove that the proposed method can improve the quality of the phase pattern better than the traditional denoising method, and can preserve the details and edge information of the phase fringes to a large extent.
- shearography /
- optical measurement /
- noise reduction /
- bitonic filtering

HTML全文

图 1 剪切散斑干涉原理

Figure 1. Principle of shearography Shear Speckle Pattern Interferometry

下载: 全尺寸图片幻灯片

图 2 正余弦变换和双调滤波相结合的去噪方法

Figure 2. Denoising method based on bitonic filtering and sine-cosine transform

下载: 全尺寸图片幻灯片

图 3 激光剪切散斑干涉测量光路

Figure 3. Experimental setup of shearography system

下载: 全尺寸图片幻灯片

图 5 各滤波后的相位图及其x轴处相位分布图

Figure 5. Phase maps after filtering and diagrams of phase distribution in x-axis

下载: 全尺寸图片幻灯片

图 4 滤波前后的正余弦相位图

Figure 4. Sine and cosine phase map before and after filtering

下载: 全尺寸图片幻灯片

图 6 金属橡胶粘接材料内部缺陷的检测

Figure 6. Detection of internal defects of a metal-rubber bonding material

下载: 全尺寸图片幻灯片

图 7 各滤波后的相位图及其x轴处相位分布图

Figure 7. Phase maps after filtering and diagram of phase distribution in x-axis

下载: 全尺寸图片幻灯片

表 1 各滤波方法不同评价参数对比

Table 1. Comparison of evaluation parameters of different filtering methods

评价方法	本文方法	正余弦中值	正余弦高斯	正余弦均值	原始图
ENL	3.338	3.327	3.324	3.329	3.124
SSI	0.999	1.001	1.002	1.002	1
SMPI	1.210	1.226	1.305	1.264	1
耗时(s)	11.36	0.79	0.58	0.89	-

下载: 导出CSV

表 2 各滤波方法不同评价参数对比

Table 2. Comparison of evaluation parameters of different filtering methods

评价方法	本文方法	正余弦中值	正余弦高斯	正余弦均值	原始图
ENL	10.236	9.586	10.052	10.059	9.368
SSI	0.957	0.989	0.965	0.965	1
SMPI	2.995	3.440	3.135	3.136	1
耗时(s)	9.76	0.41	0.25	0.24	-

下载: 导出CSV

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