Research on high-resolution imaging technology based on light field manipulation for a lenslet-based plenoptic camera

Liu Xincheng; Ma Haotong; Ren Ge; Qi Bo; Xie Zongliang; Chu Junqiu; Bai Junjie

摘要

In this paper, an aberration correction method for an extended target is proposed to solve the problem of the lenslet-based plenoptic camera not imaging clearly under the influence of aberrations. We propose a light field manipulation method to improve performance of the light field imaging system. The principle of this method is that the sub-aperture images extracted from the raw light field image are offset when the light field imaging system is affected by aberrations, and the symmetrical arrangement of the sub-aperture image array is destroyed. By repairing the symmetrical arrangement of the sub-aperture image array, the influence of phase aberrations on the imaging system can be eliminated, and the resolution of the plenoptic camera can be improved. We use an image correlation algorithm to process the sub-aperture images of the plenoptic camera, calculate and compensate each sub-aperture image's displacement caused by aberrations, and restore the symmetrical arrangement of the sub-aperture image array; then, a corrected high-resolution refocused image can be generated. In particular, this method uses only the raw light field information obtained by the plenoptic camera in a single exposure, without adding other hardware devices. Furthermore, it takes the extended target itself as the reference image, so the ideal position need not be calibrated in advance. Also, the parallax information of the sub-aperture images is retained, and the method is simple and easy to use. Numerical simulation and experimental results show that the technology proposed in this paper can work well for high-resolution imaging of a plenoptic camera with phase aberrations. This method can be potentially applied to analyze lens aberration, media-induced image distortion such as water turbulence in underwater imaging, and atmospheric turbulence in remote imaging. It may have important application prospects in the fields of astronomical object detection, remote sensing, etc. (C) 2018 Optical Society of America

机译：在本文中，提出了一种扩展目标的像差校正方法，以解决在像差影响下没有显然成像的基于透镜的增殖相机的问题。我们提出了一种轻场操纵方法，提高光场成像系统的性能。该方法的原理是当灯场成像系统受到像差影响时，从原始光场图像提取的子孔径图像被偏移，并且销毁子孔径图像阵列的对称布置。通过修复子光圈图像阵列的对称布置，可以消除相位像差对成像系统的影响，并且可以改善集气相色相机的分辨率。我们使用图像相关算法来处理集压相机的子光圈图像，计算和补偿由像差引起的每个子光圈图像的位移，并恢复子孔径图像阵列的对称布置;然后，可以生成校正的高分辨率重分部图像。特别地，该方法仅使用由集水相机获得的原始光场信息在单个曝光中，而不添加其他硬件设备。此外，它将扩展目标本身作为参考图像，因此不需要预先校准理想位置。此外，保留了子孔径图像的视差信息，并且该方法简单易用。数值模拟和实验结果表明，本文提出的技术可以很好地适用于具有相位像差的全光摄像头的高分辨率成像。该方法可以潜在地应用于分析镜头像差，媒体引起的图像失真，例如水下成像中的水湍流，以及远程成像中的大气湍流。在天文对象检测，遥感等领域可能具有重要的应用前景，遥感等（c）2018年美国光学学会

Research on high-resolution imaging technology based on light field manipulation for a lenslet-based plenoptic camera

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