NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Ghost suppression in image restoration filteringAn optimum image restoration filter is described in which provision is made to constrain the spatial extent of the restoration function, the noise level of the filter output and the rate of falloff of the composite system point-spread away from the origin. Experimental results show that sidelobes on the composite system point-spread function produce ghosts in the restored image near discontinuities in intensity level. By redetermining the filter using a penalty function that is zero over the main lobe of the composite point-spread function of the optimum filter and nonzero where the point-spread function departs from a smoothly decaying function in the sidelobe region, a great reduction in sidelobe level is obtained. Almost no loss in resolving power of the composite system results from this procedure. By iteratively carrying out the same procedure even further reductions in sidelobe level are obtained. Examples of original and iterated restoration functions are shown along with their effects on a test image.
Document ID
19760039901
Document Type
Conference Proceedings
Authors
Riemer, T. E. (Texaco, Inc. Bellaire, Tex., United States)
Mcgillem, C. D. (Purdue University West Lafayette, Ind., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Meeting Information
International Conference on Communications(San Francisco, CA)
Funding Number(s)
CONTRACT_GRANT: NAS9-14016
CONTRACT_GRANT: NGL-15-005-112
Distribution Limits
Public
Copyright
Other