Fig. 3.

Experimental results for double plane imaging. (a)–(c) Three defocus intensity images, (d) the reconstructed phase image using TIE-based phase retrieval, and (e) surface plot of the phase in (d). Recovered focus images in which (f) one bead is at focus and (g) second bead is at focus. Original focus images recorded in a conventional imaging experiment, where (h) one of the beads is at focus and (i) the second bead is at focus. (j), (k) Line plots of the intensity along the position of the beads on the recovered and the original image for (j) the first focusing distance and (k) the second focusing distance.