Speckle patterns, when properly sampled, encode both the intentisy and phase information and can be directly inverted to high-resolution and high-quality images. Miao pioneered this lensless imaging field and the applications are very broad ranging from physics, chemistry, materials science and nanoscience to biology. See their recent work for details - J. Miao, Y. Nishino, Y. Kohmura, B. Johnson, C. Song, S.H. Risbud, T. Ishikawa, “Quantitative Image Reconstruction of GaN Quantum Dots from Oversampled Diffraction Intensities Alone”, Phys. Rev. Lett. 95, 085503 (2005).