Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-05-16
1985-12-24
Britton, Howard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
73602, 128660, 455306, H04N 718
Patent
active
045610193
ABSTRACT:
Methods for improving the availability of information derived from signals received from an object irradiated with coherent pulses of any form of radiation that exhibits a wave nature are disclosed. A method for reducing speckle derives separate component noncoherent signals from the received signals, and combines these separate noncoherent signals to form improved composite noncoherent signals. Weighting and processing of component signals can be applied as a function of time, frequency, and signal amplitude to optimize speckle reduction in all or a critical part of the signal by compensating for the range and frequency dependence of attenuation and the frequency dependence of scattering phenomena. In a method for enhancing resolution, separate component coherent signals are derived from the received signals, weighted and processed, and combined to form improved composite coherent signals; then noncoherent signals are derived from the improved composite coherent signals. In both methods, signals can be processed either in the analog or digital domains or in hybrid analog/digital domains. The apparatus for performing each method also is disclosed.
REFERENCES:
patent: 3737799 (1973-06-01), Stander
patent: 4044359 (1977-08-01), Applebaum
patent: 4228804 (1980-10-01), Holaser
patent: 4412350 (1983-10-01), Miedema
patent: 4471785 (1984-09-01), Wilson
Acoustic Speckle: Theory and Experiment Analysis, by J. G. Abbott et al.
Frequency Compounding for Speckle Contrast Reduction in Phased Array Images, by P. A. Magnin et al.
A Wavelength Diversity Technique for Reduction of Speckle Size, by: M. Elbaum et al.
SNR in Photocounting Images of Rought Objects in Partially Coherent Light, by M. Elbaum.
Elbaum Marek
Feleppa Ernest J.
Lizzi Frederic L.
Britton Howard
Riverside Research Institute
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