We demonstrate a versatile thin lensless camera with a designed phase-mask placed at sub-2 mm from an imaging CMOS sensor. Using wave optics and phase retrieval methods, we present a general-purpose framework to create phase-masks that achieve desired sharp point-spread-functions (PSFs) for desired camera thicknesses. From a single 2D encoded measurement, we show the reconstruction of high-resolution 2D images, computational refocusing, and 3D imaging. This ability is made possible by our proposed high-performance contour-based PSF. The heuristic contour-based PSF is designed using concepts in signal processing to achieve maximal information transfer to a bit-depth limited sensor. Due to the efficient coding, we can use fast linear methods for high-quality image reconstructions and switch to iterative nonlinear methods for higher fidelity reconstructions and 3D imaging.

中文翻译：

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PhlatCam：基于相位掩模设计的薄型无镜头相机


我们展示了一款多功能薄型无镜头相机，其设计的相位掩模放置在距成像 CMOS 传感器不到 2 毫米的位置。使用波动光学和相位恢复方法，我们提出了一个通用框架来创建相位掩模，以实现所需的相机厚度所需的锐点扩散函数（PSF）。通过单个 2D 编码测量，我们展示了高分辨率 2D 图像的重建、计算重聚焦和 3D 成像。我们提出的基于轮廓的高性能 PSF 使这种能力成为可能。基于启发式轮廓的 PSF 是利用信号处理中的概念来设计的，以实现向位深度有限的传感器传输最大信息。由于编码高效，我们可以使用快速线性方法进行高质量图像重建，并切换到迭代非线性方法以获得更高保真度的重建和 3D 成像。