Accelerating ptychographic reconstructions using spectral initializations

Ptychography is a promising phase retrieval technique for label-free quantitative imaging. Recent advances in algorithms witnessed the development of spectral methods, order to accelerate gradient descent algorithms. Using initializations on experimental data, first time we report three times faster ptychographic reconstructions than with standard algorithm and improved resilience noise. Coming at no additional computational cost compared gradient-descent-based algorithms, methods have potential be implemented large-scale iterative