Frequency And Temporal Compounding Of Partially Correlate Signals: Speckle Suppression And Image Resolution

S. D. Silverstein; M. O'Donnell

doi:10.1117/12.976504

13 October 1987 Frequency And Temporal Compounding Of Partially Correlated Signals: Speckle Suppression And Image Resolution

S. D. Silverstein, M. O'Donnell

Author Affiliations +

Proceedings Volume 0845, Visual Communications and Image Processing II; (1987) https://doi.org/10.1117/12.976504
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States

Abstract

This work presents the results of first principle calculations of the effects of frequency and temporal compounding on speckle contrast and axial (range) resolution. Frequency compounding corresponds to the process in which a coherent pulse of a specific bandwidth is passed through a filter bank which divides the pulse into a number of sub-bands. The image is formed by incoherently summing (compounding) the intensities of the individual sub-bands. Temporal compounding falls into the category of non-linear multirate signal processing as the final pixel intensity is made up of the intensity of samples which were sampled initially at rates equal to or higher than the pulse bandwidth. The intensities of the samples are then compounded to form the final image. In the limit of infinite sampling rate, temporal compounding is equivalent exactly to analog integrated backscatter where the sensor continuously integrates the intensity of the incoming signal. The speckle contrast reduction and the decrease in resolution for these processes are discussed. These results apply to generic coherent imaging systems which can access both the amplitude and phase of signals.

Citation Download Citation

S. D. Silverstein and M. O'Donnell "Frequency And Temporal Compounding Of Partially Correlated Signals: Speckle Suppression And Image Resolution", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987); https://doi.org/10.1117/12.976504

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