Implementation of three speckle reduction filters for solid propellant combustion holograms

Download
Author
Edwards, Thomas D.
Date
1986-12Advisor
Powers, John P.
Second Reader
Netzer, David
Metadata
Show full item recordAbstract
Speckle noise appears when a diffuse light hologram of a particle field is reconstructed with a laser. The speckle must be reduced so that particles of interest may be counted and sized. This thesis describes speckle and a figure of merit known as the speckle index. Three speckle reduction filters suggested by work in the area of synthetic aperture radars were implemented, discussed and compared. An IBM AT personal computer with Itex/PC image processing software was used for the comparison. The geometric filter performed best overall, but may not be superior in every circumstance.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO2 differential absorption LIDAR (DIAL)
Nelson, Dougles H.; Petrin, Roger R.; MacKerrow, Edward P.; Schmitt, Mark J.; Quick, Charles R.; Zardecki, Andrew; Porch, William M.; Whitehead, Michael; Walters, Donald L. (Livermore, California. Lawrence Livermore National Laboratory, 1998-04);The measurement sensitivity of C02 differential absorption LIDAR (DIAL) can be affected by a number of different processes. We will address the interaction of two of these processes: effects due to beam propagation through ... -
Experimental investigation of a high resolution sonar
Huat, Lim Chin (Monterey, California. Naval Postgraduate School, 1996-03);This thesis investigated a laboratory synthetic aperture sonar designed to test the algorithms and techniques needed to detect, classify and identify minelike objects. Previous synthetic aperture sonar work at NPS achieved ... -
Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO2 lidar
Nelson, Douglas H.; Walters, Donald L.; MacKerrow, Edward P.; Schmitt, Mark J.; Quick, Charles R.; Porch, William M.; Petrin, Roger R. (2000-04);Laser speckle can influence lidar measurements from a diffuse hard target. Atmospheric optical turbulence will also affect the lidar return signal. We present a numerical simulation that models the propagation of a lidar ...