Browsing Citations Only by Author "Easton, Roger"
Now showing items 1-5 of 5
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Analysis of threshold modulations in one-dimensional error diffusion
Daels, K.; Easton, Roger; Eschbach, R. (Elsevier Science B.V., Amsterdam, 1992-01-15)Error diffusion is a numerical method for the binarization of continuous tone data. Modified error diffusion algorithms exist that introduce threshold modulations into the process. this article generalizes an analytical ... -
Error diffusion in cell-oriented Fourier-transform computer-generated holograms to compensate for printing constraints
Easton, Roger; Eschbach, R.; Nagrajan, R. (Taylor & Francis, 1996-06-01)Error-diffused quantization has been applied to the generation of cell-oriented computer-generated Fourier transform holograms, resulting in reduced reconstruction errors. Improvements are demonstrated when applied to the ... -
A Summary of recent satellite time transfers from the U.S. Naval Observatory to the Royal Greenwich Observatory and to Australia
Easton, Roger; Smith, Harold; Morgan, P. (The Institute of Electrical and Electronics Engineers (IEEE), 1974-12)This paper describes the TIMATION II satellite time transfer experiments between the U.S. Naval Observatory (USNO) and the Royal Greenwich Observatory (RGO) in 1972, and between the U.S. and Australia, in 1973. The error ... -
Two-dimensional complex Fourier-transform via the radon-transform
Easton, Roger; Ticknor, Anthony; Barrett, Harrison (Optical Society of America, 1985-11)A hybrid system has been constructed to perform the complex Fourier transform of real two-dimensional data. The system is based on the Radon transform; i.e., operations are performed on one-dimensional projections of the ... -
Two-stage spatial-filtering for diffraction pattern-analysis
Blodgett, Jerry; Easton, Roger (Optical Society of America, 1981-03)The use of optical power spectrum analysis for feature detection and classification is often restricted by the superposition of the aperture spectrum. A spatial frequency filtering technique using a circular aperture and ...