2019/05/16 by Yan Wu, Mihaela Rosca, Wu, Yan +3 · 1 voice · 25 citations
Computer Science · Engineering · Mathematics · #Image Processing Techniques and Applications #Photoacoustic and Ultrasonic Imaging #Sparse and Compressive Sensing Techniques #cs.LG #eess.SP #stat.ML
paper · pdf · doi:10.48550/arxiv.1905.06723
ICML 2019
arxiv published 2019/05/16 · arxiv created 2019/05/18 · arxiv updated 2019/05/21
Compressed sensing (CS) provides an elegant framework for recovering sparse signals from compressed measurements. For example, CS can exploit the structure of natural images and recover an image from only a few random measurements. CS is flexible and data efficient, but its application has been restricted by the strong assumption of sparsity and costly reconstruction process. A recent approach that combines CS with neural network generators has removed the constraint of sparsity, but reconstruction remains slow. Here we propose a novel framework that significantly improves both the performance and speed of signal recovery by jointly training a generator and the optimisation process for reconstruction via meta-learning. We explore training the measurements with different objectives, and derive a family of models based on minimising measurement errors. We show that Generative Adversarial Nets (GANs) can be viewed as a special case in this family of models. Borrowing insights from the CS perspective, we develop a novel way of improving GANs using gradient information from the discriminator.