Dr. Robert A. Gonsalves
Professor Emeritus
SPIE Involvement:
Profile Summary

Bob Gonsalves is an Emeritus Professor in the ECE Department at Tufts University. He received the BSEE at Tufts and the MS and Ph. D. from Northeastern University. He was a Professor at Northeastern for 20 years and spent another 20 years at Tufts. While at Tufts he received the Leibner Award for Distinguished Teaching and Advising and chaired the department for 6 years. His expertise is digital image processing, with applications in graphic arts, medicine, astronomy, and historical images. He is the founder and former President of Lexitek, Inc., which builds innovative optical products. An SPIE Fellow since 1987, he took sabbaticals at Stanford University, Zurich's Swiss Federal Institute of Technology and the University of Sydney in Australia.

In 1990 he used Phase Diversity, a method he invented in the 1970’s, to help NASA find a prescription for the flaw in the Hubble Space Telescope. More recently he was an advisor to NASA on the James Webb Space Telescope, which will use Phase Diversity to help align its segmented optics, consulted with Harvard-Smithsonian researchers on imaging exo-planets, and consulted with Lincoln Lab and AOA on Phase Diversity Imaging methods. His most recent research has been on Sequential Diversity Imaging. SDI uses sequential images from a video camera which has an AO system. The sequence of AO changes forms a natural set of phase diversities for adjacent frames of the camera. The concept could be used in any digital camera with an AO and a digital processor to perform image sharpening. No additional element, like a defocused image or a Shack-Hartman sensor, is required.

Professor Gonsalves is a former city official in Woburn, MA, where he was born. He still resides in Woburn - on a family compound on which he designed and built four homes, including a contemporary solar home.
Publications (10)

Proceedings Article | 24 May 2018 Presentation + Paper
Proceedings Volume 10677, 106771S (2018) https://doi.org/10.1117/12.2307051
KEYWORDS: Stars, Space telescopes, Mirrors

Proceedings Article | 21 July 2014 Paper
Proceedings Volume 9148, 91482P (2014) https://doi.org/10.1117/12.2054586
KEYWORDS: Stars, Point spread functions, Adaptive optics, Telescopes, Phase retrieval, James Webb Space Telescope, Space telescopes, Astronomy, Exoplanets, Image segmentation

Proceedings Article | 15 June 2006 Paper
Volker Tolls, Michael Aziz, Robert Gonsalves, Sylvain Korzennik, Antoine Labeyrie, Richard Lyon, Gary Melnick, Ruth Schlitz, Steve Somerstein, Gopal Vasudevan, Robert Woodruff
Proceedings Volume 6265, 62653K (2006) https://doi.org/10.1117/12.672647
KEYWORDS: Coronagraphy, Manufacturing, Speckle, Sensors, Scanners, Absorbance, Microelectromechanical systems, Beam propagation method, Observatories, Ion beams

Proceedings Article | 5 October 2005 Paper
Proceedings Volume 5905, 59051M (2005) https://doi.org/10.1117/12.639422
KEYWORDS: Speckle, Coronagraphy, Photomasks, Manufacturing, Planets, Mirrors, Spherical lenses, Ion beams, Wavefronts, Device simulation

Proceedings Article | 14 September 2005 Paper
Proceedings Volume 5905, 590510 (2005) https://doi.org/10.1117/12.628734
KEYWORDS: Planets, Speckle, Point spread functions, Imaging systems, Coronagraphy, Image processing, Phase retrieval, Sun, Telescopes, Speckle pattern

Showing 5 of 10 publications
Proceedings Volume Editor (1)

SPIE Conference Volume | 20 October 1993

Conference Committee Involvement (2)
Applications of Digital Image Processing XXIX
15 August 2006 | San Diego, California, United States
Applications of Digital Image Processing XVI
14 July 1993 | San Diego, CA, United States
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