Applicability of dictionary learning in compressed sensing problem

1. What are the applications of dictionary learning?
2. How is dictionary used in signal processing?

What are the applications of dictionary learning?

Fields of signal processing, remote sensing, data compression, image processing, video processing, neural network training are popular areas that use dictionary learning widely.

How is dictionary used in signal processing?

Dictionary learning is a branch of signal processing and machine learning that aims at finding a frame (called dictionary) in which some training data admits a sparse representation. The sparser the representation, the better the dictionary. Sample complexity.