We present rolling shutter speckle imaging (RSSI), a single-shot temporal speckle imaging technique that can quantitatively measure the fast dynamics of scattering media without high speed cameras. Utilizing a rolling shutter image sensor and vertically elongated speckles, RSSI can quantitatively map the speckle dynamics from a single image capture. We discuss the speckle spatiotemporal intensity correlation model for RSSI, which is validated through simulations and phantom experiments. We show in vivo quantitative blood flow imaging of the mouse brain from a snapshot measurement. In addition to imaging, we also present rolling shutter speckle plethysmography for cardiovascular monitoring.
We propose a compact and low-cost lensless camera that enables snapshot full-Stokes polarization imaging. Using a polarization-encoded aperture composed of three linear polarizers and a quarter wave plate on a lensless camera, our device can capture 4 images of different linear and circular polarization intensities in a single shot, which can be used to compute full-Stokes images. We can construct an ultra-thin polarization-sensitive lensless camera using a regular image sensor and perform video-rate polarimetry for various applications. We report on the design, construction and imaging performance of our prototype device.
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