Department of Optometry, Eulji University, 553 Sanseong-daero, Sujeong-gu, Seongnam-si, Gyonggi-do 13135, Korea.
Department of Intelligent IoT Engineering, Sangmyung University, 20 Hongjimoon-2gil, Jongno-gu, Seoul 03015, Korea.
Sensors (Basel). 2021 Oct 19;21(20):6928. doi: 10.3390/s21206928.
This paper describes a computational 3-D imaging system based on diffraction grating imaging with laser sources of multiple wavelengths. It was proven that a diffraction grating imaging system works well as a 3-D imaging system in our previous studies. The diffraction grating imaging system has advantages such as no spherical aberration and a low-cost system, compared with the well-known 3-D imaging systems based on a lens array or a camera array. However, a diffraction grating imaging system still suffers from noises, artifacts, and blurring due to the diffraction nature and illumination of single wavelength lasers. In this paper, we propose a diffraction grating imaging system with multiple wavelengths to overcome these problems. The proposed imaging system can produce multiple volumes through multiple laser illuminators with different wavelengths. Integration of these volumes can reduce noises, artifacts, and blurring in grating imaging since the original signals of 3-D objects inside these volumes are integrated by our computational reconstruction method. To apply the multiple wavelength system to a diffraction grating imaging system efficiently, we analyze the effects on the system parameters such as spatial periods and parallax angles for different wavelengths. A computational 3-D imaging system based on the analysis is proposed to enhance the image quality in diffraction grating imaging. Optical experiments with three-wavelength lasers are conducted to evaluate the proposed system. The results indicate that our diffraction grating imaging system is superior to the existing method.
本文描述了一种基于多波长激光的光栅成像的计算三维成像系统。在我们之前的研究中已经证明，光栅成像系统作为三维成像系统效果良好。与基于透镜阵列或相机阵列的著名三维成像系统相比，光栅成像系统具有无球差和低成本系统等优点。然而，由于单波长激光的衍射性质和照明，光栅成像系统仍然存在噪声、伪影和模糊等问题。在本文中，我们提出了一种具有多波长的光栅成像系统来克服这些问题。所提出的成像系统可以通过具有不同波长的多个激光照明器产生多个体积。通过我们的计算重建方法，将这些体积中的 3D 物体的原始信号进行集成，可以减少光栅成像中的噪声、伪影和模糊。为了有效地将多波长系统应用于光栅成像系统，我们分析了不同波长对系统参数（如空间周期和视差角）的影响。提出了一种基于该分析的计算三维成像系统，以提高光栅成像中的图像质量。进行了三波长激光的光学实验来评估所提出的系统。结果表明，我们的光栅成像系统优于现有方法。
