Phase Diversity (PD) is an unconventional imaging technique which uses two or more distorted views of an object to perform wavefront sensing and/or to clarify the object. In 1990 it was used to remove the flaw in the Hubble Space Telescope. A major advantage of PD is that it needs no auxiliary hardware, like a guide star or a Shack-Hartmann wavefront sensor. We review a personal path in the discovery and the use of phase diversity. That path started in 1974 with the removal of raster lines in digital-based satellite images and has led to the real-time removal of aberrations in high-performance, ground-based telescopes, among other applications. PD could be used in cell phones which maintain good image quality by changing the camera's optics. The recorded video and the changes in the camera's optics are the necessary observations needed to improve the video, with software called sequential diversity imaging.
Robert A. Gonsalves, "Phase diversity: math, methods and prospects, including sequential diversity imaging," Proc. SPIE 10677, Unconventional Optical Imaging, 106771S (Presented at SPIE Photonics Europe: April 25, 2018; Published: 24 May 2018); https://doi.org/10.1117/12.2307051.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.
Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon