USE OF SPATIAL FILTERING TO MATCH WIDE DYNAMIC RANGE GRAYSCALE IMAGERY TO A LOWER RESOLUTION DISPLAY

Authors
  1. Boulter, J.F.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
The report discusses the ability of nonlinear spatial filtering to reduce the amount of information that is lost when a display device has a lower dynamic range than the grayscale imagery to be displayed on it. Dynamic range compression can be achieved by attenuating an assumed low-frequency multiplicative background and enhancing higher frequencies using homomorphic filtering. This technique, originally described by Oppenheim for images formed by reflection of visible light, is extended to images formed by emission of IR radiation and transmission of X-ray and gamma-ray radiation. Truncated
Report Number
DREV-4074/77 —
Date of publication
15 Jan 1977
Number of Pages
48
DSTKIM No
77-01827
CANDIS No
124405
Format(s):
Hardcopy;Originator's fiche received by DSIS

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