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Deep-inverse correlography: towards real-time high-resolution non-line-of-sight imaging

Author(s): Metzler, CA; Heide, F; Rangarajan, P; Balaji, MM; Viswanath, A; et al

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Abstract: Low signal-to-noise ratio (SNR) measurements, primarily due to the quartic attenuation of intensity with distance, are arguably the fundamental barrier to real-time, high-resolution, non-line-of-sight (NLoS) imaging at long standoffs. To better model, characterize, and exploit these low SNR measurements, we use spectral estimation theory to derive a noise model for NLoS correlography. We use this model to develop a speckle correlation-based technique for recovering occluded objects from indirect reflections. Then, using only synthetic data sampled from the proposed noise model, and without knowledge of the experimental scenes nor their geometry, we train a deep convolutional neural network to solve the noisy phase retrieval problem associated with correlography. We validate that the resulting deep-inverse correlography approach is exceptionally robust to noise, far exceeding the capabilities of existing NLoS systems both in terms of spatial resolution achieved and in terms of total capture time. We use the proposed technique to demonstrate NLoS imaging with 300 µm resolution at a 1 m standoff, using just two 1/8th 𝑠 exposure-length images from a standard complementary metal oxide semiconductor detector.
Publication Date: 2020
Citation: Metzler, Christopher A., Felix Heide, Prasana Rangarajan, Muralidhar Madabhushi Balaji, Aparna Viswanath, Ashok Veeraraghavan, and Richard G. Baraniuk. "Deep-inverse correlography: towards real-time high-resolution non-line-of-sight imaging." Optica 7, no. 1 (2020): pp. 63-71. doi:10.1364/OPTICA.374026
DOI: 10.1364/OPTICA.374026
EISSN: 2334-2536
Pages: 63 - 71
Type of Material: Journal Article
Journal/Proceeding Title: Optica
Version: Final published version. This is an open access article.
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