Image analysis – Histogram processing – For setting a threshold
Patent
1991-06-03
1993-03-02
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 43, 378207, G06K 900, G01D 1800
Patent
active
051916215
ABSTRACT:
To determine the asymmetry of the line spread function in digital imaging systems, two modulation-transfer functions are calculated by differentiation of the edge spread function followed by Fourier transformation. To that end a method is used in which a radiation intensity distribution spatially modulated by a series of equidistant elongated block elements in a test object is incident upon an input screen of a detector which is connected to a digital data processing device for storing detector signal values in memory locations which correspond to picture elements of the input screen. In the data processing device first values and derived by differentiating detector signal values for picture elements located along a picture line which extends across the series of block elements, and thereafter from positive and negative derivative values there is calculated by Fourier transformation respective two sequences of frequency-consecutive local maxima, from whose envelope the respective two modulation-transfer functions are determined.
REFERENCES:
patent: 4259579 (1981-03-01), Geary
patent: 4947323 (1990-08-01), Smith
patent: 5056130 (1991-10-01), Engel
Moore David K.
Slobod Jack D.
Stellrecht Barry
U.S. Philips Corp.
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