MIT Professor - George Barbastathis visited our Lab during Jun. 7~21, 2015. 
What a nice discussion~
Topic: Optical Phase Retrieval & Digital Holographic Microscopy 

Abstract: Sparsity priors improve the condition of ill-posed or undersampled inverse problems. I will discuss how this principle applies to phase retrieval and discuss examples from digital holography, transport of intensity, phase-space tomography, and ptychography.