A SPARSE CODING APPROACH TO INVERSE PROBLEMS WITH APPLICATION TO MICROWAVE TOMOGRAPHY IMAGING

CESAR F. CAIAFA; RAMIRO MIGUEL IRASTORZA

Buenos Aires

Workshop; IAR 60th ANNIVERSARY Prospects for Low Frequency Radio Astronomy in South America; 2022

Inverse imaging problems that are ill-posed can be encountered across multiple domains of science and technology, ranging from medical diagnosis to astronomical studies. To reconstruct images from incomplete and distorted data, it is necessary to create algorithms that can take into account both, the physical mechanisms responsible for generating these measurements and the intrinsic characteristics of the images being analyzed. In this work, the sparse representation of images is reviewed, which is a realistic, compact and effective generative model for natural images inspired by the visual system of mammals. It enables us to address ill-posed linear inverse problems by training the model on a vast collection of images. Moreover, we extend the application of sparse coding to solve the non-linear and ill-posed problem in micr