Speckle reduction from digital holograms by simulating temporal incoherence

B. M. Hennelly; D. P. Kelly; J. Maycock; T. J. Naughton; J. B. McDonald

doi:10.1117/12.739492

24 September 2007 Speckle reduction from digital holograms by simulating temporal incoherence

B. M. Hennelly, D. P. Kelly, J. Maycock, T. J. Naughton, J. B. McDonald

Proceedings Volume 6696, Applications of Digital Image Processing XXX; 66961I (2007) https://doi.org/10.1117/12.739492
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

Speckle is an inherent characteristic of coherent imaging systems. Often, as in the case of Ultrasound, Synthetic Aperture Radar, Laser Imaging and Holography, speckle is a source of noise and degrades the reconstructed image. Various methods exist for the removal of speckle in such images. One method, which has received attention for the removal of speckle from coherent imaging, is to use a temporally incoherent source. We create a novel digital signal processing technique for the reduction of speckle from digital holograms by simulating temporal incoherence during the digital reconstruction process. The method makes use of the discrete implementation of the Fresnel Transform, which calculates the reconstructed image for a range of different wavelengths. These different spectral components can be weighted to suit a temporally incoherent source and the intensities from each wavelength are added together. The method is examined using the speckle index metric.

Citation Download Citation

B. M. Hennelly, D. P. Kelly, J. Maycock, T. J. Naughton, and J. B. McDonald "Speckle reduction from digital holograms by simulating temporal incoherence", Proc. SPIE 6696, Applications of Digital Image Processing XXX, 66961I (24 September 2007); https://doi.org/10.1117/12.739492

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available