Deep neural networks as image priors have been recently introduced for problems such as denoising, super-resolution and inpainting with promising performance gains over hand-crafted image priors such as sparsity and low-rank. Unlike learned generative priors they do not require any training over large datasets. However, few theoretical guarantees exist in the scope of using untrained network priors for inverse imaging problems. We explore new applications and theory for untrained network priors. Specifically, we consider the problem of solving linear inverse problems, such as compressive sensing, as well as non-linear problems, such as compressive phase retrieval. We model images to lie in the range of an untrained deep generative network with a fixed seed. We further present a projected gradient descent scheme that can be used for both compressive sensing and phase retrieval and provide rigorous theoretical guarantees for its convergence. We also show both theoretically as well as empirically that with deep network priors, one can achieve better compression rates for the same image quality compared to hand crafted priors.

本文研究了使用未经过训练的深度神经网络先验条件下的线性反演问题，包括压缩感知和相位恢复，并提出了基于梯度下降的算法以及证明了其收敛性。同时，本文还展示了相比于手工制作的先验条件，使用深度神经网络先验条件可以在相同的图像质量下实现更好的压缩率。

无预训练网络先验的反演成像的算法保证