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Regularized non-convex image reconstruction in digital holographic microscopy

机译:数字全息显微镜中规则的非凸图像重建

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摘要

Inverse problem approaches for image reconstruction can improve resolution recovery over spatial filtering methods while reducing interference artifacts in digital off-axis holography. Prior works implemented explicit regularization operators in the image space and were only able to match intensity measurements approximatively. As a consequence, convergence to a strictly compatible solution was not possible. In this paper, we replace the non-convex image reconstruction problem for a sequence of surrogate convex problems. An iterative numerical solver is designed using a simple projection operator in the data domain and a Nesterov acceleration of the simultaneous Kaczmarz method. For regularization, the complex-valued object wavefield image is represented in the multiresolution CDF 9/7 wavelet domain and an energy-weighted preconditioning promotes minimum-norm solutions. Experiments demonstrate improved resolution recovery and reduced spurious artifacts in reconstructed images. Furthermore, the method is resilient to additive Gaussian noise and subsampling of intensity measurements.
机译:图像重建的逆问题方法可以改善空间过滤方法的分辨率恢复,同时减少数字偏离轴全息术中的干扰伪像。先前作品在图像空间中实现了显式正则化运算符,并且仅能够近似地匹配强度测量值。因此,不可能收敛对严格兼容的解决方案。在本文中,我们替换了非凸图像重建问题的替代凸起问题。在数据域中使用简单投影操作员设计了迭代数值求解器,并进行同时KACZMARZ方法的Nesterov加速度。对于正规化,复值物体波场图像在多角度CDF 9/7小波域中表示,并且能量加权预处理促进最小规范溶液。实验表明,改进的分辨率恢复和重建图像中的虚假伪影。此外,该方法是适应性高斯噪声和强度测量的数据采样的弹性。

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