A novel quantitative phase imaging method is shown to estimate phase accurately over a wide range of length scales using Köhler illumination from an extended incoherent source. The method is based on estimating the longitudinal intensity derivative in the transport-of-intensity equation via convolution with multiple Savitzky-Golay differentiation filters and generalizes methods previously developed for coherent imaging to the practical scenario of partially coherent imaging. The resulting noise and resolution performance are evaluated via numerical simulation and demonstrated experimentally using a blazed transmission grating as well as a single-mode fiber as test objects.
Tomographic deconvolution phase microscopy (TDPM) is a promising
approach for 3D quantitative imaging of phase objects such as
biological cells and optical fibers. In the present work, the
alternating direction method of multipliers (ADMM) is applied to TDPM
to shorten its image acquisition and processing times while
simultaneously improving its accuracy. ADMM-TDPM is used to optimize
the image fidelity by minimizing Gaussian noise and by using total
variation regularization with the constraints of nonnegativity and
known zeros. ADMM-TDPM can reconstruct phase objects that are shift
variant in three spatial dimensions. ADMM-TDPM achieves speedups of 5x
in image acquisition time and greater than 10x in image processing
time with accompanying higher accuracy compared to TDPM.
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