Underwater Polarization Imaging Based on Mueller Matrix
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摘要: 水下偏振成像技术利用目标信息光与背景散射光的偏振特性差异实现清晰成像, 在水下目标探测和识别等领域有重要价值。但多材质目标表面反射情况和退偏效应存在差异, 无法有效提取上述偏振特性差异。针对这一问题, 文中提出一种基于Mueller矩阵的水下偏振成像方法。利用Mueller矩阵探测水下场景中的光强信息以及目标物与水体的偏振信息, 精确求解浑浊场景中目标物与背景散射光的偏振度信息, 结合传统水下成像技术构建基于Mueller矩阵的水下偏振成像方法, 有效分离目标信息光与背景散射光, 提升成像质量, 实现水下多材质目标物的清晰重建。Abstract: Underwater polarization imaging method uses the polarization characteristic difference between the target information light and the backscattered light to achieve clear imaging, which is of great value in the field of underwater target detection and recognition. However, due to the differences in the reflection and depolarization effects on the surface of objects made of diverse materials, the polarization characteristic difference cannot be effectively extracted. To address this issue, an underwater polarization imaging method based on Mueller matrix was proposed. The Mueller matrix was used to detect the light intensity information and the polarization information of the underwater target and the water, and the polarization information of the background scattered light and the target in the turbid water was accurately solved. Combined with traditional underwater imaging methods, an underwater polarization imaging method based on Mueller matrix was constructed to effectively separate the target information light from the background scattered light, improve the imaging quality, and clearly reconstruct underwater objects made of diverse materials.
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图 2 多材质目标传统水下偏振成像
Figure 2. Traditional underwater polarization imaging of object made of diverse materials
图 3 反射式双旋波片法原理图
Figure 3. Principle of reflection-based double rotating wave plate method
图 4 透射式双旋波片法原理图
Figure 4. Principle of transmission-based double rotating wave plate method
图 5 反射式双旋波片测量装置
Figure 5. Measuring device of reflection-based double rotating wave plate
图 6 透射式双旋波片测量装置
Figure 6. Measuring device of transmission-based double rotating wave plate
图 7 浑浊度17.4 NTU水体中目标物偏振度强度分布
Figure 7. Degree of polarization distribution of target in water with 17.4 NTU turbidity
图 8 不同浑浊度水体中的目标偏振图
Figure 8. Degree of polarization distribution of target in water with different turbidity
图 9 目标偏振度随浑浊度变化情况
Figure 9. Variation of degree of polarization of target with turbidity
图 10 浑浊场景背景散射光偏振度图
Figure 10. Degree of polarization of background scattered light in turbid water
图 11 特征点背景散射光偏振度随浑浊度变化情况
Figure 11. Variation of degree of polarization of feature points from background scattered light with turbidity
图 13 浑浊度40.2 NTU水体中光强图像与文中重建结果对比
Figure 13. Comparison of intensity image and reconstructed image by the proposed method in water with 40.2 NTU turbidity
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