Holographic optical field recovery using a regularized untrained deep decoder network

Image reconstruction using minimal measured information has been a long-standing open problem in many computational imaging approaches, in particular in-line holography. Many solutions are devised based on compressive sensing (CS) techniques with handcrafted image priors or supervised deep neural networks (DNN). However, the limited performance of CS methods due to lack of information about the image priors and the requirement of an enormous amount of per-sample-type training resources for DNNs has posed new challenges over the primary problem. In this study, we propose a single-shot lensless in-line holographic reconstruction method using an untrained deep neural network which is incorporated with a physical image formation algorithm.

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Fig: An overview of the proposed reconstruction algorithm. The inverse problem can be solved by optimizing a network of weights by the mean-squared loss between the intensity of the generated hologram and the recorded image in an iterative gradient descent procedure.

We demonstrate that by modifying a deep decoder network with simple regularizers, a Gabor hologram can be inversely reconstructed via a minimization process that is constrained by a deep image prior. The outcoming model allows to accurately recover the phase and amplitude images without any training dataset, excess measurements, or specific assumptions about the object’s or the measurement’s characteristics.

Niknam, F., Qazvini, H. & Latifi, H. Holographic optical field recovery using a regularized untrained deep decoder network. Sci Rep 11,10903 (2021). https://doi.org/10.1038/s41598-021-90312-5

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