用散斑片和条纹偏振膜实现单帧捕捉四幅偏振图像。
A Lensless Polarization Camera
- 用散斑片替代镜头，结合条纹偏振掩膜进行编码成像。
- 单次快照即可重建出四幅线性偏振图像。
- 揭示了影响重建质量的物理因素，指导实际系统设计。
偏振成像可生成场景中偏振状态的像素图。尽管人眼不可见，偏振信息能辅助多种感知与计算机视觉任务。现有偏振相机多采用空间或时间复用方案，导致体积大、重量重、成本高。近期无透镜成像方法（如 DiffuserCam）表明，通过用编码元件替代镜头并配合计算重建，可实现紧凑型成像系统。本文提出一种紧凑型无透镜偏振相机，由散斑片与简单条纹偏振掩膜组成。结合显式建模偏振编码测量的重建算法，仅需单次快照即可恢复四幅线性偏振图像。实验结果展示了无透镜方法在偏振成像中的潜力，并揭示了决定重建质量的关键物理因素，为高质量实用系统的设计提供指导。
原文摘要 · Abstract (English)
Polarization imaging is a technique that creates a pixel map of the polarization state in a scene. Although invisible to the human eye, polarization can assist various sensing and computer vision tasks. Existing polarization cameras use spatial or temporal multiplexing, which increases the camera volume, weight, cost, or all of the above. Recent lensless imaging approaches, such as DiffuserCam, have demonstrated that compact imaging systems can be realized by replacing the lens with a coding element and performing computational reconstruction. In this work, we propose a compact lensless polarization camera composed of a diffuser and a simple striped polarization mask. By combining this optical design with a reconstruction algorithm that explicitly models the polarization-encoded lensless measurements, four linear polarization images are recovered from a single snapshot. Our results demonstrate the potential of lensless approaches for polarization imaging and reveal the physical factors that govern reconstruction quality, guiding the development of high-quality practical systems.
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